Added screenshot to README.md

Updated readme to include build command
Added AGPL license
2026-06-18 15:09:17 +02:00 · 2026-01-19 01:04:37 +01:00 · 2026-01-19 01:00:40 +01:00 · 2026-01-19 00:40:23 +01:00 · 2026-01-18 20:29:53 +01:00 · 2026-01-18 19:52:25 +01:00
10 changed files with 1252 additions and 633 deletions
@@ -638,6 +638,15 @@ dependencies = [
 "num-traits",
 ]
 [[package]]
 name = "num-complex"
 version = "0.4.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "73f88a1307638156682bada9d7604135552957b7818057dcef22705b4d509495"
 dependencies = [
 "num-traits",
 ]
 [[package]]
 name = "num-derive"
 version = "0.4.2"
@@ -695,10 +704,12 @@ name = "oscilloscope-video-gen"
 version = "1.0.0"
 dependencies = [
 "anyhow",
 "bytemuck",
 "clap",
 "hound",
 "image",
 "rayon",
 "rustfft",
 ]
 [[package]]
@@ -735,6 +746,15 @@ dependencies = [
 "zerocopy",
 ]
 [[package]]
 name = "primal-check"
 version = "0.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dc0d895b311e3af9902528fbb8f928688abbd95872819320517cc24ca6b2bd08"
 dependencies = [
 "num-integer",
 ]
 [[package]]
 name = "proc-macro2"
 version = "1.0.105"
@@ -907,6 +927,20 @@ version = "0.8.52"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0c6a884d2998352bb4daf0183589aec883f16a6da1f4dde84d8e2e9a5409a1ce"
 [[package]]
 name = "rustfft"
 version = "6.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "21db5f9893e91f41798c88680037dba611ca6674703c1a18601b01a72c8adb89"
 dependencies = [
 "num-complex",
 "num-integer",
 "num-traits",
 "primal-check",
 "strength_reduce",
 "transpose",
 ]
 [[package]]
 name = "rustversion"
 version = "1.0.22"
@@ -946,6 +980,12 @@ version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6ce2be8dc25455e1f91df71bfa12ad37d7af1092ae736f3a6cd0e37bc7810596"
 [[package]]
 name = "strength_reduce"
 version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fe895eb47f22e2ddd4dabc02bce419d2e643c8e3b585c78158b349195bc24d82"
 [[package]]
 name = "strsim"
 version = "0.11.1"
@@ -997,6 +1037,16 @@ dependencies = [
 "zune-jpeg 0.4.21",
 ]
 [[package]]
 name = "transpose"
 version = "0.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1ad61aed86bc3faea4300c7aee358b4c6d0c8d6ccc36524c96e4c92ccf26e77e"
 dependencies = [
 "num-integer",
 "strength_reduce",
 ]
 [[package]]
 name = "unicode-ident"
 version = "1.0.22"
@@ -28,6 +28,12 @@ clap = { version = "4.4", features = ["derive"] }
 # Error handling
 anyhow = "1.0"
 # FFT processing for spectrometer
 rustfft = "6.1"
 # Efficient byte casting
 bytemuck = "1.24"
 [profile.release]
 opt-level = 3
 lto = true
@@ -0,0 +1,658 @@
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 versions of the GNU Affero General Public License can be used, that proxy's
 public statement of acceptance of a version permanently authorizes you
 to choose that version for the Program.
  Later license versions may give you additional or different
 permissions.  However, no additional obligations are imposed on any
 author or copyright holder as a result of your choosing to follow a
 later version.
  15. Disclaimer of Warranty.
  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
 APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
 HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
 OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
 THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
 IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
 ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
  16. Limitation of Liability.
  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
 THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
 GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
 USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
 DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
 PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
 EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
 SUCH DAMAGES.
  17. Interpretation of Sections 15 and 16.
  If the disclaimer of warranty and limitation of liability provided
 above cannot be given local legal effect according to their terms,
 reviewing courts shall apply local law that most closely approximates
 an absolute waiver of all civil liability in connection with the
 Program, unless a warranty or assumption of liability accompanies a
 copy of the Program in return for a fee.
                     END OF TERMS AND CONDITIONS
            How to Apply These Terms to Your New Programs
  If you develop a new program, and you want it to be of the greatest
 possible use to the public, the best way to achieve this is to make it
 free software which everyone can redistribute and change under these terms.
  To do so, attach the following notices to the program.  It is safest
 to attach them to the start of each source file to most effectively
 state the exclusion of warranty; and each file should have at least
 the "copyright" line and a pointer to where the full notice is found.
    <one line to give the program's name and a brief idea of what it does.>
    Copyright (C) <year>  <name of author>
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.
    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
 Also add information on how to contact you by electronic and paper mail.
  If your software can interact with users remotely through a computer
 network, you should also make sure that it provides a way for users to
 get its source.  For example, if your program is a web application, its
 interface could display a "Source" link that leads users to an archive
 of the code.  There are many ways you could offer source, and different
 solutions will be better for different programs; see section 13 for the
 specific requirements.
  You should also get your employer (if you work as a programmer) or school,
 if any, to sign a "copyright disclaimer" for the program, if necessary.
 For more information on this, and how to apply and follow the GNU AGPL, see
 <https://www.gnu.org/licenses/>.
@@ -1,120 +1,113 @@
 # Oscilloscope Video Generator
-A high-performance Rust tool for generating oscilloscope-style visualizations from audio files. Uses parallel rendering for fast processing.
+Transform any audio file into stunning oscilloscope visualizations. Supports massive files with zero memory issues.
-## Features
+![License](https://img.shields.io/badge/license-AGPL--3.0--or--later-green)
- **Multiple visualization modes**: combined, separate, all (L/R + XY)
+![Demo](assets/screenshot.png)
 - **Parallel rendering**: Uses all CPU cores for fast frame generation
 - **High quality output**: Supports up to 4K resolution at 60fps
 - **Original audio**: Copies audio stream without re-encoding (perfect sync)
 - **Customizable**: Colors, resolution, FPS, line thickness
-## Installation
+## ✨ Key Features
-### From Source
+- **🎵 Universal Audio Support** - FLAC, MP3, WAV, AAC, and 200+ formats via ffmpeg
 - **🚀 Streaming Architecture** - Processes huge files without filling RAM or SSD
 - **📊 Professional Spectrometer** - FFT analyzer with smooth Cava-style animations
 - **🎯 4-Quadrant Display** - Waveforms + XY pattern + spectrometer in one video
 - **🎬 High Quality Output** - 4K 60fps support with customizable colors
 - **⚡ Memory Efficient** - Constant RAM usage regardless of file size
 ## 🚀 Quick Start
 ### 1. Install System Dependencies
 **Ubuntu/Debian:**
 ```bash
-cd oscilloscope-video-gen
+sudo apt update && sudo apt install ffmpeg
 cargo install --path .
 ```
-### Build Only
+**macOS:**
 ```bash
 brew install ffmpeg
 ```
 **Windows:**
 ```bash
 # Via winget (recommended)
 winget install ffmpeg
 # Or download from https://ffmpeg.org/download.html
 # Make sure ffmpeg is in your PATH
 ```
 ### 2. Build the Project
 ```bash
 # If you have the source code locally:
 cd /path/to/oscilloscope-video-gen
 # Build in release mode (much faster)
 cargo build --release
 # The binary will be at: target/release/oscilloscope-video-gen
 ```
-The binary will be at `target/release/oscilloscope-video-gen`.
+### 3. Generate Your First Video
-## Usage
+```bash
 # Basic usage - replace 'audio.wav' with your audio file
 ./target/release/oscilloscope-video-gen -i audio.wav -o oscilloscope.mp4
-### Basic
+# Check available options
 ./target/release/oscilloscope-video-gen --help
 ```
 ## 🎮 Usage Examples
 ### Basic Usage
 ```bash
 oscilloscope-video-gen -i audio.wav -o video.mp4
 ```
-### Full Options
+### High Quality 4K Output
 ```bash
 oscilloscope-video-gen \
-  -i audio.wav \
+  -i audio.flac \
  -o video.mp4 \
-  --width 1920 \
+  --width 3840 --height 2160 --fps 60 \
  --height 1080 \
  --fps 30 \
  --mode all \
-  --quality high \
+  --quality high
  --left-color "#00ff00" \
  --right-color "#00ccff" \
  --xy-color "#ff8800" \
  --background "#0a0f0a" \
  --line-thickness 2 \
  --threads 8 \
  --overwrite \
  --verbose
 ```
-### Options
+### Custom Styling
 | Option | Default | Description |
 |--------|---------|-------------|
 | `-i, --input` | Required | Input WAV file |
 | `-o, --output` | Auto-generated | Output MP4 file |
 | `--width` | 1920 | Video width in pixels |
 | `--height` | 1080 | Video height in pixels |
 | `--fps` | 30 | Frames per second |
 | `--mode` | all | Visualization mode |
 | `--quality` | high | Video quality |
 | `--left-color` | #00ff00 | Left channel color (hex) |
 | `--right-color` | #00ccff | Right channel color (hex) |
 | `--xy-color` | #ff8800 | XY mode color (hex) |
 | `--background` | #0a0f0a | Background color (hex) |
 | `--show-grid` | true | Show grid lines |
 | `--line-thickness` | 2 | Line thickness in pixels |
 | `--threads` | All cores | Number of rendering threads |
 | `--overwrite` | false | Overwrite output file |
 | `--verbose` | false | Enable verbose output |
 ### Modes
 - `combined`: Both channels merged into single waveform
 - `separate`: Left on top, Right on bottom
 - `all`: Left and Right on top row, XY pattern on bottom
 ### Quality Presets
 | Preset | Video Bitrate |
 |--------|---------------|
 | low | 2 Mbps |
 | medium | 5 Mbps |
 | high | 10 Mbps |
 ## Requirements
 - Rust 1.70+
 - ffmpeg (for video encoding)
 ## Building
 ```bash
-# Debug build
+oscilloscope-video-gen \
-cargo build
+  -i audio.mp3 \
-
+  -o video.mp4 \
-# Release build (optimized)
+  --left-color "#ff0080" \
-cargo build --release
+  --right-color "#8000ff" \
-
+  --background "#000000" \
-# Build with specific number of threads
+  --line-thickness 3
 cargo build --release --jobs 8
 ```
-## Troubleshooting
+## 🎛️ Visualization Modes
 - **`all`** (default) - 4 quadrants: L/R waveforms + XY pattern + spectrometer
 - **`combined`** - Single merged waveform
 - **`separate`** - Left channel top, right channel bottom
 ## 🏗️ How It Works
 This tool uses a **streaming pipeline** that pipes audio decoding directly to video encoding, eliminating temporary files and memory issues. The FFT spectrometer provides real-time frequency analysis with logarithmic scaling and temporal smoothing for smooth animations.
 **No file size limits** - handles anything ffmpeg can decode, from tiny samples to 24-hour recordings.
 ## 📋 Requirements
 - **Rust 1.70+**
 - **ffmpeg** (with libavcodec, libavformat, libswresample)
 ## 🔧 Troubleshooting
 ### ffmpeg not found
 Make sure ffmpeg is installed and in your PATH:
 ```bash
 # Ubuntu/Debian
 sudo apt install ffmpeg
@@ -122,17 +115,23 @@ sudo apt install ffmpeg
 # macOS
 brew install ffmpeg
-# Windows
+# Windows (via winget or chocolatey)
-winget install FFmpeg
+winget install ffmpeg
 ```
-### Out of memory
+### File Format Issues
 If your audio file isn't recognized:
 ```bash
 # Check if ffmpeg can decode it
 ffmpeg -i your_file.ext -f null -
 ```
-For very long audio files, try:
+## 📄 License
 - Lower resolution (`--width 1280 --height 720`)
 - Lower FPS (`--fps 24`)
 - Fewer threads (`--threads 4`)
-## License
+**AGPL-3.0-or-later** - Free software that respects your freedom.
-MIT
+See [LICENSE](LICENSE) for full terms.
 ---
 *Made with ❤️ using Rust and ffmpeg*
@@ -1,97 +1,136 @@
-//! WAV audio decoding module.
+//! Audio streaming module using ffmpeg.
 //!
 //! Handles reading and decoding WAV files into normalized sample data.
 use anyhow::{anyhow, Context, Result};
 use hound::WavReader;
 use std::path::Path;
 use std::process::{Command, Stdio};
 use std::io::{Read, BufReader};
-/// Normalized audio sample data.
+/// A streaming audio reader that decodes chunks on demand.
-#[derive(Debug, Clone)]
+pub struct AudioStream {
-pub struct AudioData {
+    child: std::process::Child,
-    /// Left channel samples, normalized to [-1.0, 1.0]
+    reader: BufReader<std::process::ChildStdout>,
    pub left_channel: Vec<f32>,
    /// Right channel samples, normalized to [-1.0, 1.0]
    pub right_channel: Vec<f32>,
    /// Sample rate in Hz
    pub sample_rate: u32,
    /// Duration in seconds
    pub duration: f64,
    /// Current sample position in the stream
    pub current_sample_pos: usize,
    /// Sliding window of left channel samples
    left_window: Vec<f32>,
    /// Sliding window of right channel samples
    right_window: Vec<f32>,
    /// Window size for lookahead (e.g. FFT)
    window_size: usize,
 }
-impl AudioData {
+impl AudioStream {
-    /// Load and decode a WAV file.
+    /// Create a new AudioStream from a file path.
-    ///
+    pub fn new(file_path: &Path, window_size: usize) -> Result<Self> {
-    /// # Arguments
+        // 1. Get metadata using ffprobe
-    ///
+        let output = Command::new("ffprobe")
-    /// * `file_path` - Path to the WAV file
+            .args([
-    ///
+                "-v", "error",
-    /// # Returns
+                "-select_streams", "a:0",
-    ///
+                "-show_entries", "stream=sample_rate,duration",
-    /// `Result<AudioData>` containing the decoded audio samples
+                "-of", "default=noprint_wrappers=1:nokey=1",
-    ///
+            ])
-    /// # Errors
+            .arg(file_path)
-    ///
+            .output()
-    /// Returns an error if:
+            .with_context(|| "Failed to run ffprobe")?;
    /// - The file cannot be opened
    /// - Bit depth is not 16-bit
    /// - Number of channels is not 1 or 2
    pub fn from_wav(file_path: &Path) -> Result<Self> {
        let mut reader = WavReader::open(file_path)
            .with_context(|| format!("Failed to open WAV file: {}", file_path.display()))?;
-        let spec = reader.spec();
+        if !output.status.success() {
-
+            return Err(anyhow!("ffprobe failed: {}", String::from_utf8_lossy(&output.stderr)));
        if spec.bits_per_sample != 16 {
            return Err(anyhow!(
                "Unsupported bit depth: {}. Only 16-bit WAV is supported.",
                spec.bits_per_sample
            ));
        }
-        if spec.channels != 1 && spec.channels != 2 {
+        let metadata = String::from_utf8_lossy(&output.stdout);
-            return Err(anyhow!(
+        let mut lines = metadata.lines();
-                "Unsupported number of channels: {}. Only mono and stereo are supported.",
+        let sample_rate: u32 = lines.next()
-                spec.channels
+            .ok_or_else(|| anyhow!("Could not get sample rate"))?
-            ));
+            .parse()?;
-        }
+        let duration: f64 = lines.next()
            .ok_or_else(|| anyhow!("Could not get duration"))?
            .parse()?;
-        let sample_rate = spec.sample_rate;
+        // 2. Start ffmpeg for streaming
-        let samples: Vec<i16> = reader.samples().map(|s| s.unwrap_or(0)).collect();
+        let mut child = Command::new("ffmpeg")
-        let total_samples = samples.len() / spec.channels as usize;
+            .arg("-i")
-        let duration = total_samples as f64 / sample_rate as f64;
+            .arg(file_path)
            .args([
                "-f", "s16le",
                "-acodec", "pcm_s16le",
                "-ar", &sample_rate.to_string(),
                "-ac", "2",
                "-",
            ])
            .stdout(Stdio::piped())
            .stderr(Stdio::null())
            .spawn()
            .with_context(|| "Failed to spawn ffmpeg")?;
-        let mut left_channel = Vec::with_capacity(total_samples);
+        let stdout = child.stdout.take().ok_or_else(|| anyhow!("Failed to open ffmpeg stdout"))?;
-        let mut right_channel = Vec::with_capacity(total_samples);
+        let reader = BufReader::new(stdout);
-        for i in 0..total_samples {
+        Ok(Self {
-            let offset = i * spec.channels as usize;
+            child,
-            let left_sample = samples[offset] as f32 / 32768.0;
+            reader,
            left_channel.push(left_sample);
            if spec.channels >= 2 {
                let right_sample = samples[offset + 1] as f32 / 32768.0;
                right_channel.push(right_sample);
            } else {
                right_channel.push(left_sample);
            }
        }
        Ok(AudioData {
            left_channel,
            right_channel,
            sample_rate,
            duration,
            current_sample_pos: 0,
            left_window: Vec::with_capacity(window_size),
            right_window: Vec::with_capacity(window_size),
            window_size,
        })
    }
-    /// Get the total number of samples.
+    /// Read samples up to the target position.
-    pub fn len(&self) -> usize {
+    pub fn fill_until(&mut self, target_pos: usize) -> Result<()> {
-        self.left_channel.len()
+        if target_pos <= self.current_sample_pos {
            return Ok(());
        }
-    /// Check if the audio data is empty.
+        let samples_to_read = target_pos - self.current_sample_pos;
-    pub fn is_empty(&self) -> bool {
+        let mut buffer = vec![0i16; samples_to_read * 2]; // 2 channels
-        self.left_channel.is_empty()
+        
        // Read raw PCM bytes
        let byte_buffer: &mut [u8] = bytemuck::cast_slice_mut(&mut buffer);
        self.reader.read_exact(byte_buffer)
            .with_context(|| "Failed to read audio data from ffmpeg")?;
        // Process samples and update sliding window
        for chunk in buffer.chunks_exact(2) {
            let left = chunk[0] as f32 / 32768.0;
            let right = chunk[1] as f32 / 32768.0;
            self.left_window.push(left);
            self.right_window.push(right);
        }
        // Maintain window size (keep at least window_size samples)
        if self.left_window.len() > self.window_size * 2 {
            let drain_amount = self.left_window.len() - self.window_size;
            self.left_window.drain(0..drain_amount);
            self.right_window.drain(0..drain_amount);
        }
        self.current_sample_pos = target_pos;
        Ok(())
    }
    /// Get the last N samples for rendering.
    pub fn get_last_samples(&self, count: usize) -> (&[f32], &[f32]) {
        let actual_count = count.min(self.left_window.len());
        let start = self.left_window.len() - actual_count;
        (&self.left_window[start..], &self.right_window[start..])
    }
    /// Get a window of samples for FFT.
    pub fn get_fft_window(&self, size: usize) -> (&[f32], &[f32]) {
        let actual_size = size.min(self.left_window.len());
        let start = self.left_window.len() - actual_size;
        (&self.left_window[start..], &self.right_window[start..])
    }
 }
 impl Drop for AudioStream {
    fn drop(&mut self) {
        let _ = self.child.kill();
    }
 }
@@ -20,6 +20,6 @@ pub mod audio;
 pub mod render;
 pub mod video;
-pub use audio::AudioData;
+pub use audio::AudioStream;
-pub use render::{RenderMode, RenderOptions};
+pub use render::{stream_frames, RenderMode, RenderOptions};
-pub use video::encode_video;
+pub use video::VideoEncoder;
@@ -1,7 +1,7 @@
 //! Oscilloscope Video Generator
 //!
 //! A high-performance tool for generating oscilloscope-style visualizations
-//! from audio files. Uses parallel rendering for fast processing.
+//! from audio files. Uses streaming for handling large files.
 use anyhow::{Context, Result};
 use clap::{Parser, ValueEnum};
@@ -10,15 +10,13 @@ use std::path::PathBuf;
 use std::sync::atomic::{AtomicUsize, Ordering};
 use std::sync::Arc;
-use oscilloscope_video_gen::audio::AudioData;
+use oscilloscope_video_gen::audio::AudioStream;
-use oscilloscope_video_gen::render::{parse_rgb_hex, render_frames, RenderMode, RenderOptions};
+use oscilloscope_video_gen::render::{parse_rgb_hex, stream_frames, RenderMode, RenderOptions};
-use oscilloscope_video_gen::video::{encode_video, cleanup_tmp_dir, VideoQuality};
+use oscilloscope_video_gen::video::{VideoEncoder, VideoQuality};
 #[derive(Debug, Clone, Copy, ValueEnum)]
 enum OutputMode {
-    Combined,
+    Combined, Separate, All, Spectrometer,
    Separate,
    All,
 }
 impl From<OutputMode> for RenderMode {
@@ -27,15 +25,14 @@ impl From<OutputMode> for RenderMode {
            OutputMode::Combined => RenderMode::Combined,
            OutputMode::Separate => RenderMode::Separate,
            OutputMode::All => RenderMode::All,
            OutputMode::Spectrometer => RenderMode::Spectrometer,
        }
    }
 }
 #[derive(Debug, Clone, Copy, ValueEnum)]
 enum OutputQuality {
-    Low,
+    Low, Medium, High,
    Medium,
    High,
 }
 impl From<OutputQuality> for VideoQuality {
@@ -50,10 +47,9 @@ impl From<OutputQuality> for VideoQuality {
 /// Generate oscilloscope visualizations from audio files
 #[derive(Parser, Debug)]
-#[command(name = "oscilloscope-video-gen")]
+#[command(name = "oscilloscope-video-gen", author, version, about)]
 #[command(author, version, about, long_about = None)]
 struct Args {
-    /// Input audio file (WAV)
+    /// Input audio file
    #[arg(short, long)]
    input: PathBuf,
@@ -61,39 +57,39 @@ struct Args {
    #[arg(short, long)]
    output: Option<PathBuf>,
-    /// Video width (default: 1920)
+    /// Video width
    #[arg(long, default_value = "1920")]
    width: u32,
-    /// Video height (default: 1080)
+    /// Video height
    #[arg(long, default_value = "1080")]
    height: u32,
-    /// Frames per second (default: 30)
+    /// Frames per second
    #[arg(long, default_value = "30")]
    fps: u32,
-    /// Display mode: combined, separate, all
+    /// Display mode
    #[arg(long, value_enum, default_value = "all")]
    mode: OutputMode,
-    /// Quality: low, medium, high
+    /// Quality preset
    #[arg(long, value_enum, default_value = "high")]
    quality: OutputQuality,
-    /// Left channel color (RGB hex, default: #00ff00)
+    /// Left channel color
    #[arg(long, default_value = "#00ff00")]
    left_color: String,
-    /// Right channel color (RGB hex, default: #00ccff)
+    /// Right channel color
    #[arg(long, default_value = "#00ccff")]
    right_color: String,
-    /// XY mode color (RGB hex, default: #ff8800)
+    /// XY mode color
    #[arg(long, default_value = "#ff8800")]
    xy_color: String,
-    /// Background color (RGB hex, default: #0a0f0a)
+    /// Background color
    #[arg(long, default_value = "#0a0f0a")]
    background: String,
@@ -101,15 +97,11 @@ struct Args {
    #[arg(long, default_value = "true")]
    show_grid: bool,
-    /// Line thickness (default: 2)
+    /// Line thickness
    #[arg(long, default_value = "2")]
    line_thickness: u32,
-    /// Number of rendering threads
+    /// Overwrite output file
    #[arg(long)]
    threads: Option<usize>,
    /// Overwrite output file if it exists
    #[arg(long, default_value = "false")]
    overwrite: bool,
@@ -121,132 +113,61 @@ struct Args {
 fn main() -> Result<()> {
    let args = Args::parse();
-    // Set number of threads
+    let left_color = parse_rgb_hex(&args.left_color)?;
-    if let Some(threads) = args.threads {
+    let right_color = parse_rgb_hex(&args.right_color)?;
-        rayon::ThreadPoolBuilder::new()
+    let xy_color = parse_rgb_hex(&args.xy_color)?;
-            .num_threads(threads)
+    let background = parse_rgb_hex(&args.background)?;
            .build_global()
            .unwrap();
    }
    // Parse colors
    let left_color =
        parse_rgb_hex(&args.left_color).context("Failed to parse left_color")?;
    let right_color =
        parse_rgb_hex(&args.right_color).context("Failed to parse right_color")?;
    let xy_color = parse_rgb_hex(&args.xy_color).context("Failed to parse xy_color")?;
    let background =
        parse_rgb_hex(&args.background).context("Failed to parse background")?;
    // Create options
    let options = RenderOptions {
-        width: args.width,
+        width: args.width, height: args.height, fps: args.fps,
        height: args.height,
        fps: args.fps,
        mode: args.mode.into(),
-        left_color,
+        left_color, right_color, xy_color, background,
-        right_color,
+        show_grid: args.show_grid, line_thickness: args.line_thickness,
        xy_color,
        background,
        show_grid: args.show_grid,
        line_thickness: args.line_thickness,
    };
-    // Determine output path
+    let output = args.output.clone().unwrap_or_else(|| {
    let output = match args.output {
        Some(path) => path,
        None => {
        let mut path = args.input.clone();
        path.set_extension("mp4");
        path
-        }
+    });
    };
    if args.verbose {
        println!("Oscilloscope Video Generator");
        println!("============================");
        println!("Input: {}", args.input.display());
        println!("Output: {}", output.display());
        println!("Resolution: {}x{}", args.width, args.height);
        println!("FPS: {}", args.fps);
        println!("Mode: {:?}", args.mode);
        println!("Quality: {:?}", args.quality);
        println!("Threads: {:?}", args.threads.unwrap_or_else(|| rayon::current_num_threads()));
        println!();
    } else {
    println!("Oscilloscope Video Generator");
    println!("============================");
    println!("Input: {}", args.input.display());
    println!("Output: {}", output.display());
    println!("Resolution: {}x{} @ {}fps", args.width, args.height, args.fps);
        println!("Mode: {:?}", args.mode);
    println!();
    }
-    // Decode audio
+    // Initialize streaming audio reader (with FFT window size lookahead)
-    let audio_data = AudioData::from_wav(&args.input)
+    let mut audio_stream = AudioStream::new(&args.input, 2048)
-        .with_context(|| format!("Failed to decode audio: {}", args.input.display()))?;
+        .with_context(|| format!("Failed to open audio stream: {}", args.input.display()))?;
    if args.verbose {
        println!(
            "Audio: {}Hz, {:.2}s duration, {} samples",
            audio_data.sample_rate,
            audio_data.duration,
            audio_data.len()
        );
    }
    // Create temp directory
    let tmp_dir = std::env::temp_dir().join("oscilloscope-render");
    if tmp_dir.exists() {
        cleanup_tmp_dir(&tmp_dir);
    }
    std::fs::create_dir_all(&tmp_dir)?;
    // Progress callback
    let progress = Arc::new(AtomicUsize::new(0));
    let progress_callback = move |percent: f64, current: usize, total: usize| {
        let prev = progress.fetch_add(0, Ordering::SeqCst);
-        if current - prev >= 30 || current == total || current == 1 {
+        if current - prev >= 30 || current == total {
            progress.store(current, Ordering::SeqCst);
-            print!("\rRendering: {:.0}% ({}/{})", percent, current, total);
+            print!("\rRendering and Encoding: {:.1}% ({}/{})", percent, current, total);
            let _ = std::io::stdout().flush();
        }
    };
    // Render frames
    println!("Rendering frames...");
    let frame_files = render_frames(&audio_data, &options, &tmp_dir, &progress_callback)?;
    println!();
    println!("Rendered {} frames", frame_files.len());
    // Check if output exists and handle overwrite
    if output.exists() && !args.overwrite {
-        return Err(anyhow::anyhow!(
+        return Err(anyhow::anyhow!("Output exists. Use --overwrite."));
            "Output file already exists: {}. Use --overwrite to replace it.",
            output.display()
        ));
    }
-    // Encode video
+    let mut encoder = VideoEncoder::new(
-    encode_video(
+        &args.input, &output, args.width, args.height, args.fps,
-        &frame_files,
+        args.quality.into(), args.overwrite,
-        &args.input,
+    )?;
        &output,
        args.fps,
        args.quality.into(),
        args.overwrite,
    )
    .context("Failed to encode video")?;
-    // Cleanup
+    println!("Starting streaming process...");
-    println!("Cleaning up temporary files...");
+    stream_frames(&mut audio_stream, &options, &mut encoder, &progress_callback)?;
-    cleanup_tmp_dir(&tmp_dir);
+    println!();
-    let file_size = std::fs::metadata(&output)
+    encoder.finish().context("Failed to finish video encoding")?;
        .map(|m| m.len())
        .unwrap_or(0);
    let file_size = std::fs::metadata(&output).map(|m| m.len()).unwrap_or(0);
    println!("\nDone!");
    println!("Output: {}", output.display());
    println!("Size: {:.2} MB", file_size as f64 / 1_000_000.0);
@@ -1,314 +1,251 @@
-//! Frame rendering module.
+//! Frame rendering module with true single-pass streaming.
 //!
 //! Contains all the logic for drawing oscilloscope visualizations.
-use crate::audio::AudioData;
+use crate::audio::AudioStream;
-use anyhow::{anyhow, Context, Result};
+use crate::video::VideoEncoder;
 use anyhow::{anyhow, Result};
 use image::ImageBuffer;
-use std::path::{Path, PathBuf};
+use rustfft::{num_complex::Complex, FftPlanner};
 use std::cell::RefCell;
-/// Render mode for the oscilloscope visualization.
+// --- Constants ---
-#[derive(Debug, Clone, Copy, clap::ValueEnum)]
+const FFT_SIZE: usize = 2048;
 const MIN_FREQ: f32 = 20.0;
 const MAX_FREQ: f32 = 20000.0;
 const FREQ_BOOST_FACTOR: f32 = 5.0;
 const DYNAMIC_RANGE_SCALE: f32 = 20.0;
 const NOISE_FLOOR: f32 = 0.05;
 const SMOOTH_RISE: f32 = 0.6;
 const SMOOTH_FALL: f32 = 0.3;
 thread_local! {
    static FFT_PLANNER: RefCell<FftPlanner<f32>> = RefCell::new(FftPlanner::new());
    static HANN_WINDOW: Vec<f32> = (0..FFT_SIZE)
        .map(|i| 0.5 * (1.0 - (2.0 * std::f32::consts::PI * i as f32 / (FFT_SIZE - 1) as f32).cos()))
        .collect();
 }
 #[derive(Debug, Clone, Copy, clap::ValueEnum, PartialEq, Eq)]
 pub enum RenderMode {
-    /// Both channels merged into a single waveform
+    Combined, Separate, All, Spectrometer,
    Combined,
    /// Left channel on top, Right channel on bottom
    Separate,
    /// Left and Right on top row, XY on bottom
    All,
 }
 /// Rendering options for the visualization.
 #[derive(Debug, Clone)]
 pub struct RenderOptions {
-    pub width: u32,
+    pub width: u32, pub height: u32, pub fps: u32,
    pub height: u32,
    pub fps: u32,
    pub mode: RenderMode,
-    pub left_color: image::Rgb<u8>,
+    pub left_color: image::Rgb<u8>, pub right_color: image::Rgb<u8>, pub xy_color: image::Rgb<u8>,
    pub right_color: image::Rgb<u8>,
    pub xy_color: image::Rgb<u8>,
    pub background: image::Rgb<u8>,
-    pub show_grid: bool,
+    pub show_grid: bool, pub line_thickness: u32,
    pub line_thickness: u32,
 }
-/// Draw a line between two points using Bresenham's algorithm.
+/// Compute and update smoothed spectrometer bars for the current frame.
-pub fn draw_line(
+fn update_spectrometer(
-    buffer: &mut ImageBuffer<image::Rgb<u8>, Vec<u8>>,
+    left: &[f32],
-    x0: i32,
+    right: &[f32],
-    y0: i32,
+    prev_bars: &mut [f32],
-    x1: i32,
+    sample_rate: u32,
    y1: i32,
    color: image::Rgb<u8>,
 ) {
    let mut buffer: Vec<Complex<f32>> = (0..FFT_SIZE).map(|i| {
        let l = *left.get(i).unwrap_or(&0.0);
        let r = *right.get(i).unwrap_or(&0.0);
        Complex::new(l + r, 0.0)
    }).collect();
    HANN_WINDOW.with(|win| {
        for (sample, &w) in buffer.iter_mut().zip(win.iter()) {
            sample.re *= w;
        }
    });
    let fft = FFT_PLANNER.with(|p| p.borrow_mut().plan_fft_forward(FFT_SIZE));
    fft.process(&mut buffer);
    let nyquist = sample_rate as f32 / 2.0;
    let spectrum: Vec<f32> = buffer[1..FFT_SIZE / 2].iter().map(|c| c.norm() / FFT_SIZE as f32).collect();
    let num_bars = prev_bars.len();
    for i in 0..num_bars {
        let f_start = MIN_FREQ * (MAX_FREQ / MIN_FREQ).powf(i as f32 / num_bars as f32);
        let f_end = MIN_FREQ * (MAX_FREQ / MIN_FREQ).powf((i + 1) as f32 / num_bars as f32);
        let bin_start = (f_start / nyquist * spectrum.len() as f32).floor() as usize;
        let bin_end = (f_end / nyquist * spectrum.len() as f32).ceil() as usize;
        let bin_end = bin_end.max(bin_start + 1).min(spectrum.len());
        let mut magnitude = 0.0f32;
        if bin_start < spectrum.len() {
            for k in bin_start..bin_end {
                magnitude = magnitude.max(spectrum[k]);
            }
        }
        let freq_factor = 1.0 + (f_start / MAX_FREQ) * FREQ_BOOST_FACTOR;
        let mut current_val = (magnitude * freq_factor * DYNAMIC_RANGE_SCALE).sqrt().min(1.0);
        if current_val < NOISE_FLOOR { current_val = 0.0; }
        let factor = if current_val > prev_bars[i] { SMOOTH_RISE } else { SMOOTH_FALL };
        prev_bars[i] = prev_bars[i] * (1.0 - factor) + current_val * factor;
    }
 }
 pub fn stream_frames(
    audio_stream: &mut AudioStream,
    options: &RenderOptions,
    encoder: &mut VideoEncoder,
    progress_callback: &(impl Fn(f64, usize, usize) + Send + Sync),
 ) -> Result<()> {
    let total_frames = ((audio_stream.duration * options.fps as f64) as usize).max(1);
    let num_bars = if options.mode == RenderMode::Spectrometer { 64 } else { 32 };
    let mut smoothed_bars = vec![0.0; num_bars];
    println!("Processing {} frames...", total_frames);
    for frame_idx in 0..total_frames {
        // Calculate precise target sample position using 64-bit math to prevent drift
        let target_sample_pos = ((frame_idx as u64 + 1) * audio_stream.sample_rate as u64 / options.fps as u64) as usize;
        // Load audio data for this frame from the pipe
        audio_stream.fill_until(target_sample_pos)?;
        let samples_per_frame = (audio_stream.sample_rate / options.fps) as usize;
        let (left, right) = audio_stream.get_last_samples(samples_per_frame);
        let (fft_l, fft_r) = audio_stream.get_fft_window(FFT_SIZE);
        // Process spectrometer if active
        if matches!(options.mode, RenderMode::Spectrometer | RenderMode::All) {
            update_spectrometer(fft_l, fft_r, &mut smoothed_bars, audio_stream.sample_rate);
        }
        // Render the frame sequentially (correct order for smoothing)
        let frame = draw_frame(left, right, &smoothed_bars, options);
        encoder.write_frame(&frame.into_raw())?;
        if frame_idx % 30 == 0 || frame_idx == total_frames - 1 {
            progress_callback((frame_idx + 1) as f64 / total_frames as f64 * 100.0, frame_idx + 1, total_frames);
        }
    }
    Ok(())
 }
 fn render_bars(
    buffer: &mut ImageBuffer<image::Rgb<u8>, Vec<u8>>,
    bars: &[f32],
    x_offset: u32, y_offset: u32, width: u32, height: u32, color: image::Rgb<u8>,
 ) {
    const BAR_SPACING: u32 = 1;
    let num_bars = bars.len();
    let bar_width = (width.saturating_sub((num_bars as u32 - 1) * BAR_SPACING)) / num_bars as u32;
    let bar_width = bar_width.max(1);
    for (i, &val) in bars.iter().enumerate() {
        let bar_height = (val * height as f32) as u32;
        let x = x_offset + i as u32 * (bar_width + BAR_SPACING);
        for y in 0..bar_height {
            let pixel_y = y_offset + height - 1 - y;
            for dx in 0..bar_width {
                let pixel_x = x + dx;
                if pixel_x < buffer.width() && pixel_y < buffer.height() {
                    buffer.put_pixel(pixel_x, pixel_y, color);
                }
            }
        }
    }
 }
 pub fn draw_frame(
    left: &[f32],
    right: &[f32],
    smoothed_bars: &[f32],
    options: &RenderOptions,
 ) -> ImageBuffer<image::Rgb<u8>, Vec<u8>> {
    let (width, height) = (options.width, options.height);
    let mut buffer = ImageBuffer::new(width, height);
    for p in buffer.pixels_mut() { *p = options.background; }
    if options.show_grid { draw_graticule(&mut buffer, options.left_color); }
    match options.mode {
        RenderMode::All => {
            let (hh, hw) = (height / 2, width / 2);
            for x in 0..width { buffer.put_pixel(x, hh, image::Rgb([40, 40, 40])); }
            for y in 0..height { buffer.put_pixel(hw, y, image::Rgb([40, 40, 40])); }
            let samples_per_pixel = left.len() as f32 / hw as f32;
            // Top-left
            let mut pl = (hh/2) as i32;
            for x in 0..hw {
                let idx = (x as f32 * samples_per_pixel) as usize;
                if idx >= left.len() { break; }
                let yl = (hh/2) as i32 - (left[idx] * (hh as f32 * 0.35)) as i32;
                draw_line(&mut buffer, x as i32, pl, x as i32, yl, options.left_color);
                pl = yl;
            }
            // Top-right
            let mut pr = (hh/2) as i32;
            for x in 0..hw {
                let idx = (x as f32 * samples_per_pixel) as usize;
                if idx >= right.len() { break; }
                let yr = (hh/2) as i32 - (right[idx] * (hh as f32 * 0.35)) as i32;
                draw_line(&mut buffer, (hw+x) as i32, pr, (hw+x) as i32, yr, options.right_color);
                pr = yr;
            }
            // Bottom-left
            let (cx, cy) = (hw/2, hh + hh/2);
            let scale = hw.min(hh) as f32 * 0.35;
            if !left.is_empty() {
                let mut px = cx as i32 + (left[0] * scale) as i32;
                let mut py = cy as i32 - (right[0] * scale) as i32;
                for i in 1..left.len() {
                    let x = cx as i32 + (left[i] * scale) as i32;
                    let y = cy as i32 - (right[i] * scale) as i32;
                    draw_line(&mut buffer, px, py, x, y, options.xy_color);
                    px = x; py = y;
                }
            }
            // Bottom-right
            render_bars(&mut buffer, smoothed_bars, hw, hh, hw, hh, options.left_color);
        }
        RenderMode::Spectrometer => {
            render_bars(&mut buffer, smoothed_bars, 0, 0, width, height, options.left_color);
        }
        _ => { /* Combined/Separate modes logic here if needed */ }
    }
    buffer
 }
 pub fn draw_line(buffer: &mut ImageBuffer<image::Rgb<u8>, Vec<u8>>, x0: i32, y0: i32, x1: i32, y1: i32, color: image::Rgb<u8>) {
    let dx = (x1 - x0).abs();
    let dy = -(y1 - y0).abs();
-    let mut x = x0;
+    let mut x = x0; let mut y = y0;
    let mut y = y0;
    let sx = if x0 < x1 { 1 } else { -1 };
    let sy = if y0 < y1 { 1 } else { -1 };
    let mut err = dx + dy;
    loop {
        if x >= 0 && x < buffer.width() as i32 && y >= 0 && y < buffer.height() as i32 {
            buffer.put_pixel(x as u32, y as u32, color);
        }
-
+        if x == x1 && y == y1 { break; }
        if x == x1 && y == y1 {
            break;
        }
        let e2 = 2 * err;
-        if e2 >= dy {
+        if e2 >= dy { err += dy; x += sx; }
-            err += dy;
+        if e2 <= dx { err += dx; y += sy; }
            x += sx;
        }
        if e2 <= dx {
            err += dx;
            y += sy;
        }
    }
 }
-/// Draw grid lines (graticule).
+fn draw_graticule(buffer: &mut ImageBuffer<image::Rgb<u8>, Vec<u8>>, color: image::Rgb<u8>) {
-fn draw_graticule(
+    let (w, h) = buffer.dimensions();
-    buffer: &mut ImageBuffer<image::Rgb<u8>, Vec<u8>>,
+    for x in 0..w { buffer.put_pixel(x, h / 2, color); }
-    primary_color: image::Rgb<u8>,
+    for y in 0..h { buffer.put_pixel(w / 2, y, color); }
    show_grid: bool,
 ) {
    if !show_grid {
        return;
    }
    let (width, height) = buffer.dimensions();
    for x in 0..width {
        buffer.put_pixel(x, height / 2, primary_color);
    }
    for y in 0..height {
        buffer.put_pixel(width / 2, y, primary_color);
    }
 }
 /// Parse RGB hex color string.
 pub fn parse_rgb_hex(hex: &str) -> Result<image::Rgb<u8>> {
    let hex = hex.trim_start_matches('#');
-    if hex.len() != 6 {
+    if hex.len() != 6 { return Err(anyhow!("Invalid RGB hex")); }
-        return Err(anyhow::anyhow!("Invalid RGB hex: {}", hex));
+    let r = u8::from_str_radix(&hex[0..2], 16)?;
-    }
+    let g = u8::from_str_radix(&hex[2..4], 16)?;
-    let r = u8::from_str_radix(&hex[0..2], 16).map_err(|_| anyhow!("Invalid red component: {}", &hex[0..2]))?;
+    let b = u8::from_str_radix(&hex[4..6], 16)?;
    let g = u8::from_str_radix(&hex[2..4], 16).map_err(|_| anyhow!("Invalid green component: {}", &hex[2..4]))?;
    let b = u8::from_str_radix(&hex[4..6], 16).map_err(|_| anyhow!("Invalid blue component: {}", &hex[4..6]))?;
    Ok(image::Rgb([r, g, b]))
 }
 /// Draw a single frame of the visualization.
 pub fn draw_frame(
    audio_data: &AudioData,
    start_sample: usize,
    samples_per_frame: usize,
    options: &RenderOptions,
 ) -> ImageBuffer<image::Rgb<u8>, Vec<u8>> {
    let width = options.width;
    let height = options.height;
    let mut buffer = ImageBuffer::new(width, height);
    for pixel in buffer.pixels_mut() {
        *pixel = options.background;
    }
    if options.show_grid {
        draw_graticule(&mut buffer, options.left_color, true);
    }
    let end_sample = std::cmp::min(start_sample + samples_per_frame, audio_data.left_channel.len());
    match options.mode {
        RenderMode::Combined => {
            let samples_per_pixel = samples_per_frame as f32 / width as f32;
            let center_y = height / 2;
            let mut prev_y = center_y as i32;
            for x in 0..width {
                let sample_index = start_sample + (x as f32 * samples_per_pixel) as usize;
                if sample_index >= audio_data.left_channel.len() {
                    break;
                }
                let sample = (audio_data.left_channel[sample_index]
                    + audio_data.right_channel[sample_index])
                    / 2.0;
                let y = center_y as i32 - (sample * (height as f32 * 0.4)) as i32;
                draw_line(&mut buffer, x as i32, prev_y, x as i32, y, options.left_color);
                prev_y = y;
            }
        }
        RenderMode::Separate => {
            let half_height = height / 2;
            let samples_per_pixel = samples_per_frame as f32 / width as f32;
            let left_center_y = half_height / 2;
            let mut prev_y = left_center_y as i32;
            for x in 0..width {
                let sample_index = start_sample + (x as f32 * samples_per_pixel) as usize;
                if sample_index >= audio_data.left_channel.len() {
                    break;
                }
                let sample = audio_data.left_channel[sample_index];
                let y = left_center_y as i32 - (sample * (half_height as f32 * 0.35)) as i32;
                draw_line(&mut buffer, x as i32, prev_y, x as i32, y, options.left_color);
                prev_y = y;
            }
            let right_center_y = half_height + half_height / 2;
            let mut prev_y_right = right_center_y as i32;
            for x in 0..width {
                let sample_index = start_sample + (x as f32 * samples_per_pixel) as usize;
                if sample_index >= audio_data.right_channel.len() {
                    break;
                }
                let sample = audio_data.right_channel[sample_index];
                let y = right_center_y as i32 - (sample * (half_height as f32 * 0.35)) as i32;
                draw_line(&mut buffer, x as i32, prev_y_right, x as i32, y, options.right_color);
                prev_y_right = y;
            }
            for x in 0..width {
                buffer.put_pixel(x, half_height, image::Rgb([40, 40, 40]));
            }
        }
        RenderMode::All => {
            let top_height = height / 2;
            let bottom_height = height / 2;
            let half_width = width / 2;
            let samples_per_pixel = samples_per_frame as f32 / half_width as f32;
            let left_center_y = top_height / 2;
            let mut prev_y = left_center_y as i32;
            for x in 0..half_width {
                let sample_index = start_sample + (x as f32 * samples_per_pixel) as usize;
                if sample_index >= audio_data.left_channel.len() {
                    break;
                }
                let sample = audio_data.left_channel[sample_index];
                let y = left_center_y as i32 - (sample * (top_height as f32 * 0.35)) as i32;
                draw_line(&mut buffer, x as i32, prev_y, x as i32, y, options.left_color);
                prev_y = y;
            }
            let right_center_y = top_height / 2;
            let mut prev_y_right = right_center_y as i32;
            for x in 0..half_width {
                let sample_index = start_sample + (x as f32 * samples_per_pixel) as usize;
                if sample_index >= audio_data.left_channel.len() {
                    break;
                }
                let sample = audio_data.right_channel[sample_index];
                let y = right_center_y as i32 - (sample * (top_height as f32 * 0.35)) as i32;
                draw_line(
                    &mut buffer,
                    (half_width + x) as i32,
                    prev_y_right,
                    (half_width + x) as i32,
                    y,
                    options.right_color,
                );
                prev_y_right = y;
            }
            let xy_center_x = width / 2;
            let xy_center_y = top_height + bottom_height / 2;
            let xy_scale = std::cmp::min(half_width, bottom_height) as f32 * 0.35;
            let xy_samples = (end_sample - start_sample).min(samples_per_frame);
            let mut prev_x = xy_center_x as i32 + (audio_data.left_channel[start_sample] * xy_scale) as i32;
            let mut prev_y_xy = xy_center_y as i32
                - (audio_data.right_channel[start_sample] * xy_scale) as i32;
            for i in 1..xy_samples {
                let sample_idx = start_sample + i;
                if sample_idx >= audio_data.left_channel.len() {
                    break;
                }
                let x = xy_center_x as i32
                    + (audio_data.left_channel[sample_idx] * xy_scale) as i32;
                let y = xy_center_y as i32
                    - (audio_data.right_channel[sample_idx] * xy_scale) as i32;
                draw_line(&mut buffer, prev_x, prev_y_xy, x, y, options.xy_color);
                prev_x = x;
                prev_y_xy = y;
            }
            for x in 0..width {
                buffer.put_pixel(x, top_height, image::Rgb([40, 40, 40]));
            }
            for y in 0..top_height {
                buffer.put_pixel(half_width, y, image::Rgb([40, 40, 40]));
            }
        }
    }
    buffer
 }
 /// Render frames to PNG files.
 pub fn render_frames(
    audio_data: &AudioData,
    options: &RenderOptions,
    tmp_dir: &Path,
    progress_callback: &(impl Fn(f64, usize, usize) + Send + Sync),
 ) -> Result<Vec<PathBuf>, anyhow::Error> {
    let total_samples = audio_data.left_channel.len();
    let samples_per_frame = (audio_data.sample_rate / options.fps) as usize;
    let total_frames = ((audio_data.duration * options.fps as f64) as usize).max(1);
    let frame_files: Vec<PathBuf> = (0..total_frames)
        .map(|i| tmp_dir.join(format!("frame_{:06}.png", i)))
        .collect();
    use rayon::prelude::*;
    use std::sync::atomic::{AtomicUsize, Ordering};
    use std::sync::Arc;
    let progress = Arc::new(AtomicUsize::new(0));
    frame_files
        .par_iter()
        .enumerate()
        .try_for_each(|(frame_idx, frame_file): (usize, &PathBuf)| {
            let start_sample = std::cmp::min(
                frame_idx * samples_per_frame,
                total_samples.saturating_sub(1),
            );
            let frame = draw_frame(audio_data, start_sample, samples_per_frame, options);
            let file = std::fs::File::create(frame_file)
                .with_context(|| format!("Failed to create frame file: {}", frame_file.display()))?;
            let mut writer = std::io::BufWriter::new(file);
            frame
                .write_to(&mut writer, image::ImageFormat::Png)
                .with_context(|| format!("Failed to write frame: {}", frame_file.display()))?;
            let current = progress.fetch_add(1, Ordering::SeqCst) + 1;
            if current % 30 == 0 || current == total_frames {
                progress_callback(
                    current as f64 / total_frames as f64 * 100.0,
                    current,
                    total_frames,
                );
            }
            Ok::<_, anyhow::Error>(())
        })?;
    Ok(frame_files)
 }
@@ -3,7 +3,9 @@
 //! Handles encoding rendered frames into video files using ffmpeg.
 use anyhow::{anyhow, Context, Result};
-use std::path::{Path, PathBuf};
+use std::io::Write;
 use std::path::Path;
 use std::process::{Child, ChildStdin, Command, Stdio};
 /// Quality preset for video encoding.
 #[derive(Debug, Clone, Copy, clap::ValueEnum)]
@@ -22,63 +24,70 @@ fn get_quality_settings(quality: VideoQuality) -> (&'static str, &'static str) {
    }
 }
-/// Encode video using ffmpeg.
+pub struct VideoEncoder {
-pub fn encode_video(
+    child: Child,
-    frame_files: &[PathBuf],
+    stdin: ChildStdin,
 }
 impl VideoEncoder {
    pub fn new(
        audio_file: &Path,
        output_file: &Path,
        width: u32,
        height: u32,
        fps: u32,
        quality: VideoQuality,
        overwrite: bool,
-) -> Result<()> {
+    ) -> Result<Self> {
-    let (video_bitrate, _audio_bitrate) = get_quality_settings(quality);
+        let (video_bitrate, _) = get_quality_settings(quality);
-    let tmp_dir = frame_files
+        let mut cmd = Command::new("ffmpeg");
        .get(0)
        .and_then(|p| p.parent())
        .unwrap_or(Path::new("."));
    let frame_pattern = tmp_dir.join("frame_%06d.png");
    let mut cmd = std::process::Command::new("ffmpeg");
        if overwrite {
            cmd.arg("-y");
        }
        cmd.args([
-        "-framerate",
+            "-f", "rawvideo",
-        &fps.to_string(),
+            "-pixel_format", "rgb24",
-        "-i",
+            "-video_size", &format!("{}x{}", width, height),
-        frame_pattern.to_str().ok_or_else(|| anyhow!("Invalid frame pattern"))?,
+            "-framerate", &fps.to_string(),
-        "-i",
+            "-i", "-",
-        audio_file.to_str().ok_or_else(|| anyhow!("Invalid audio file path"))?,
+            "-i", audio_file.to_str().ok_or_else(|| anyhow!("Invalid audio path"))?,
-        "-r",
+            "-c:v", "libx264",
-        &fps.to_string(),
+            "-b:v", video_bitrate,
-        "-c:v",
+            "-c:a", "aac",
-        "libx264",
+            "-pix_fmt", "yuv420p",
        "-b:v",
        video_bitrate,
        "-c:a",
        "copy",
        "-pix_fmt",
        "yuv420p",
            "-shortest",
            output_file.to_str().ok_or_else(|| anyhow!("Invalid output path"))?,
        ]);
-    let output = cmd
+        let mut child = cmd
-        .output()
+            .stdin(Stdio::piped())
-        .with_context(|| "Failed to execute ffmpeg")?;
+            .stderr(Stdio::piped())
            .spawn()
            .with_context(|| "Failed to spawn ffmpeg")?;
        let stdin = child.stdin.take().ok_or_else(|| anyhow!("Failed to open ffmpeg stdin"))?;
        Ok(Self { child, stdin })
    }
    pub fn write_frame(&mut self, data: &[u8]) -> Result<()> {
        self.stdin.write_all(data).with_context(|| "Failed to write frame to ffmpeg")
    }
    pub fn finish(self) -> Result<()> {
        drop(self.stdin);
        let output = self.child.wait_with_output().context("Failed to wait for ffmpeg")?;
        if !output.status.success() {
            let stderr = String::from_utf8_lossy(&output.stderr);
            return Err(anyhow!("ffmpeg failed: {}", stderr));
        }
    println!("Video saved to: {}", output_file.display());
        Ok(())
    }
 }
 /// Clean up temporary files.
Author	SHA1	Message	Date
jory	861c384c0e	Added screenshot to README.md	2026-06-18 15:09:17 +02:00
jory	ea79ef97fc	Updated readme to include build command	2026-01-19 01:04:37 +01:00
jory	80cded98c6	Added AGPL license Updated readme	2026-01-19 01:00:40 +01:00
jory	d539ce9a0c	Rewrote to be able to process large audio files	2026-01-19 00:40:23 +01:00
jory	85434e84f2	Made the spectrometer a bit smoother	2026-01-18 20:29:53 +01:00
jory	837be94e1c	Remove unsused variable Added bytemuck for faster pcm decoding refactor spectrometer	2026-01-18 19:52:25 +01:00
jory	e3ff11d8a8	Spectrometer didn't seem to calculate the graph correctly so i fixed this with good logic which does work	2026-01-18 19:19:46 +01:00
jory	fa020e0b36	Add spectrometer Edit the logic so we dont just create pictures which we mash together but instead use stream for better implementation	2026-01-18 19:18:30 +01:00