### Install: Installing av-scenechange from Crates.io Source: https://github.com/rust-av/av-scenechange/blob/master/README.md Shows how to install the av-scenechange binary directly from crates.io using Cargo. Includes an example of installing with specific features enabled. ```bash # Install the latest version (automatically uses release optimizations) cargo install av-scenechange # Install with ffmpeg, ffms2, and vapoursynth input support cargo install av-scenechange --features ffmpeg,ffms2,vapoursynth ``` -------------------------------- ### Rust Library: Detecting Scene Changes Source: https://github.com/rust-av/av-scenechange/blob/master/README.md Provides an example of using the av-scenechange Rust library to programmatically detect scene changes. Requires initializing a decoder and configuring detection options. ```rust use av_scenechange::{detect_scene_changes, DetectionOptions, SceneDetectionSpeed}; let mut decoder = // ... initialize your decoder let options = DetectionOptions { analysis_speed: SceneDetectionSpeed::Standard, detect_flashes: true, min_scenecut_distance: Some(24), max_scenecut_distance: Some(250), ..DetectionOptions::default() }; let results = detect_scene_changes(&mut decoder, options, None, None)?; ``` -------------------------------- ### Configure Scene Change Detection Speed and Intervals in Rust Source: https://context7.com/rust-av/av-scenechange/llms.txt Demonstrates how to configure detection parameters for scene change detection using `av-scenechange` in Rust. It shows examples of `Fast`, `Standard`, and `None` (fixed intervals) modes, allowing for tradeoffs between detection speed and accuracy. The code utilizes `DetectionOptions` and `SceneDetectionSpeed` enums for customization. Dependencies include `av_decoders` and `av_scenechange`. The output is a `Result` containing detected scene changes, which can optionally be serialized to JSON. ```rust use av_decoders::Decoder; use av_scenechange::{detect_scene_changes, DetectionOptions, SceneDetectionSpeed}; fn main() -> anyhow::Result<()> { let mut decoder = Decoder::from_file("input.y4m")?; // Fast mode: quickest detection, lower accuracy let fast_options = DetectionOptions { analysis_speed: SceneDetectionSpeed::Fast, detect_flashes: false, // Disable for maximum speed lookahead_distance: 1, ..DetectionOptions::default() }; // Standard mode: balanced quality and speed let standard_options = DetectionOptions { analysis_speed: SceneDetectionSpeed::Standard, detect_flashes: true, min_scenecut_distance: Some(24), // Minimum 1 second at 24fps max_scenecut_distance: Some(240), // Maximum 10 seconds at 24fps lookahead_distance: 5, }; // No detection mode: fixed intervals only let fixed_options = DetectionOptions { analysis_speed: SceneDetectionSpeed::None, detect_flashes: false, min_scenecut_distance: None, max_scenecut_distance: Some(120), // Force keyframe every 120 frames lookahead_distance: 1, }; // Choose based on use case let results = detect_scene_changes::( &mut decoder, standard_options, None, None )?; // Serialize results to JSON #[cfg(feature = "serialize")] { let json = serde_json::to_string_pretty(&results)?; std::fs::write("scenecuts.json", json)?; } Ok(()) } ``` -------------------------------- ### Build: Compiling av-scenechange from Source Source: https://github.com/rust-av/av-scenechange/blob/master/README.md Instructions for cloning the repository and building the av-scenechange project from source using Cargo. Includes options for default features (assembly optimizations) and disabling them. ```bash # Clone the repository git clone https://github.com/rust-av/av-scenechange.git cd av-scenechange # Build with default features (includes optimized assembly) cargo build --release # Build without assembly optimizations (no NASM required) cargo build --release --no-default-features --features binary # Build with additional features cargo build --release --features ffmpeg # FFmpeg input support cargo build --release --features vapoursynth # VapourSynth input support ``` -------------------------------- ### Command Line: Faster Detection Mode Source: https://github.com/rust-av/av-scenechange/blob/master/README.md Illustrates using the --speed option to select a faster, though potentially less accurate, scene detection mode. ```bash av-scenechange input.y4m --speed 1 ``` -------------------------------- ### Command Line: Basic Usage of av-scenechange Source: https://github.com/rust-av/av-scenechange/blob/master/README.md Demonstrates the fundamental command-line invocation for scene change detection using an input Y4M file. Outputs results to standard output. ```bash av-scenechange input.y4m ``` -------------------------------- ### Command Line: Reading from Stdin Source: https://github.com/rust-av/av-scenechange/blob/master/README.md Shows how to pipe video data from standard input to av-scenechange for processing. ```bash cat input.y4m | av-scenechange - ``` -------------------------------- ### Command Line: Minimum Scenecut Interval Source: https://github.com/rust-av/av-scenechange/blob/master/README.md Demonstrates setting a minimum frame interval between consecutive scene cuts using the --min-scenecut option. ```bash av-scenechange input.y4m --min-scenecut 24 ``` -------------------------------- ### Command Line: Saving Output to File Source: https://github.com/rust-av/av-scenechange/blob/master/README.md Shows how to redirect the scene change detection results from stdout to a specified JSON file using the -o or --output option. ```bash av-scenechange input.y4m -o results.json ``` -------------------------------- ### Custom Scene Change Detection Parameters (CLI) Source: https://context7.com/rust-av/av-scenechange/llms.txt Process video files with customized scene change detection settings using the command-line tool. Options include adjusting detection speed, setting minimum and maximum intervals between scene cuts, disabling flash detection, and specifying output files. This allows for fine-tuning the detection process for specific video characteristics and requirements. ```bash # Fast detection mode with minimum 24-frame interval av-scenechange input.y4m --speed 1 --min-scenecut 24 --output results.json # Disable flash detection and force scenecuts every 250 frames av-scenechange input.y4m --no-flash-detection --max-scenecut 250 -o output.json # Read from stdin (useful for piping) cat video.y4m | av-scenechange - > scenecuts.json ``` -------------------------------- ### FFmpeg Input Scene Change Detection (CLI) Source: https://context7.com/rust-av/av-scenechange/llms.txt Analyze video files of various formats compatible with FFmpeg using the command-line tool, provided it was compiled with FFmpeg support. This command demonstrates how to process formats like MP4 and MKV, applying standard or custom detection parameters, and directing the JSON output to a file. ```bash # Install with FFmpeg support cargo install av-scenechange --features ffmpeg # Process MP4 file with standard detection av-scenechange video.mp4 -o scenecuts.json # Fast mode with custom intervals av-scenechange video.mkv --speed 1 --min-scenecut 12 --max-scenecut 300 ``` -------------------------------- ### Basic Scene Detection with Default Options (Rust API) Source: https://context7.com/rust-av/av-scenechange/llms.txt Utilize the Rust library API for scene change detection within a Rust application. This snippet shows how to open a video file, configure detection options (like speed, flash detection, and distance constraints), and run the detection process. It handles different bit depths for decoding and provides access to the detected scene changes, frame count, processing speed, and individual frame scores. ```rust use av_decoders::Decoder; use av_scenechange::{detect_scene_changes, DetectionOptions, SceneDetectionSpeed}; fn main() -> anyhow::Result<()> { // Open video file let mut decoder = Decoder::from_file("input.y4m")?; let bit_depth = decoder.get_video_details().bit_depth; // Configure detection options let options = DetectionOptions { analysis_speed: SceneDetectionSpeed::Standard, detect_flashes: true, min_scenecut_distance: Some(24), max_scenecut_distance: Some(250), lookahead_distance: 5, }; // Run detection (use u8 for 8-bit, u16 for 10-bit+) let results = if bit_depth == 8 { detect_scene_changes::(&mut decoder, options, None, None)? } else { detect_scene_changes::(&mut decoder, options, None, None)? }; // Access results println!("Detected {} scene changes", results.scene_changes.len()); println!("Scene change frames: {:?}", results.scene_changes); println!("Total frames: {}", results.frame_count); println!("Processing speed: {:.2} FPS", results.speed); // Examine individual frame scores for (frame_num, score) in &results.scores { println!( "Frame {}: inter_cost={:.1}, threshold={:.1}", frame_num, score.inter_cost, score.threshold ); } Ok(()) } ``` -------------------------------- ### Basic Scene Change Detection (CLI) Source: https://context7.com/rust-av/av-scenechange/llms.txt Perform basic scene change detection on a Y4M video file using the command-line interface. The output, including scene change frame numbers and scoring metrics, is printed to standard output in JSON format. This provides a quick way to analyze video content without custom parameters. ```bash # Basic usage with Y4M file av-scenechange video.y4m # Example output: # {"scene_changes":[0,125,289,456,720],"scores":{"125":{"inter_cost":45.2,"imp_block_cost":12.3,"backward_adjusted_cost":38.1,"forward_adjusted_cost":42.5,"threshold":35.0}},"frame_count":1000,"speed":245.3} ``` -------------------------------- ### Rust Scene Change Detection with Progress Callback Source: https://context7.com/rust-av/av-scenechange/llms.txt Monitor the scene change detection progress in real-time using a callback function. This is useful for updating UI elements or displaying progress bars during long processing tasks. The callback receives the number of frames processed and the count of detected keyframes. ```rust use av_decoders::Decoder; use av_scenechange::{detect_scene_changes, DetectionOptions, SceneDetectionSpeed}; fn main() -> anyhow::Result<()> { let mut decoder = Decoder::from_file("input.y4m")?; let options = DetectionOptions { analysis_speed: SceneDetectionSpeed::Standard, detect_flashes: true, min_scenecut_distance: Some(12), max_scenecut_distance: Some(300), lookahead_distance: 5, }; // Progress callback receives (frames_processed, keyframe_count) let progress_fn = |frames: usize, keyframes: usize| { if frames % 100 == 0 { println!("Processed {} frames, found {} keyframes", frames, keyframes); } }; // Run detection with progress tracking let results = detect_scene_changes::( &mut decoder, options, None, // No frame limit Some(&progress_fn) )?; println!("\nDetection complete!"); println!("Total frames: {}", results.frame_count); println!("Scene changes: {}", results.scene_changes.len()); println!("Average speed: {:.2} FPS", results.speed); Ok(()) } ``` -------------------------------- ### Advanced Frame-by-Frame Scene Change Detection in Rust Source: https://context7.com/rust-av/av-scenechange/llms.txt Analyze frames individually for streaming or incremental processing using SceneChangeDetector API. This allows full control over the detection process, including custom options like analysis speed, flash detection, and lookahead distance. It requires decoder and detection options as input and outputs detected keyframes. ```rust use av_decoders::Decoder; use av_scenechange::{new_detector, DetectionOptions, SceneDetectionSpeed}; use std::sync::Arc; fn main() -> anyhow::Result<()> { let mut decoder = Decoder::from_file("input.y4m")?; let bit_depth = decoder.get_video_details().bit_depth; let options = DetectionOptions { analysis_speed: SceneDetectionSpeed::Fast, detect_flashes: true, lookahead_distance: 5, ..DetectionOptions::default() }; // Create detector (use u8 or u16 based on bit depth) let mut detector = new_detector::(&mut decoder, options)?; // Enable caching for performance (optional) detector.enable_cache(); // Frame buffer for lookahead let mut frame_buffer = Vec::new(); let mut keyframes = vec![0]; // First frame is always a keyframe let mut frame_num = 0; // Read frames into buffer while let Ok(frame) = decoder.read_video_frame() { frame_buffer.push(Arc::new(frame)); // Need at least 2 frames to start detection if frame_buffer.len() >= 2 && frame_num > 0 { // Create frame set for analysis (current + lookahead) let frame_set: Vec<_> = frame_buffer .iter() .take(options.lookahead_distance + 2) .collect(); // Analyze this frame let previous_keyframe = *keyframes.last().unwrap(); let (is_scenecut, score) = detector.analyze_next_frame( &frame_set, frame_num, previous_keyframe ); if is_scenecut { keyframes.push(frame_num); println!("Scenecut detected at frame {}", frame_num); } if let Some(score) = score { println!( "Frame {}: cost={:.1}, adjusted={:.1}, threshold={:.1}", frame_num, score.inter_cost, score.forward_adjusted_cost, score.threshold ); } // Remove old frame from buffer frame_buffer.remove(0); } frame_num += 1; } println!("Total keyframes: {}", keyframes.len()); println!("Keyframe positions: {:?}", keyframes); Ok(()) } ``` === COMPLETE CONTENT === This response contains all available snippets from this library. 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