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Migration from H.264 (AVC) to VP9 requires re-encoding your existing video library, repackaging the output, and verifying playback compatibility across browsers, players, and CDNs. This transition is performed to achieve lower bitrates at the same visual quality, especially for modern browsers that support VP9 decoding. Assess Compatibility and Infrastructure Before transcoding, verify whether your existing delivery stack supports VP9 decoding. VP9 is supported by most modern browsers (Chrome, Firefox, Edge, Safari 14+) and Android devices, but older iOS and embedded systems may still require H.264 fallback. Check the following: Playback Stack — Confirm your web player (e.g., Shaka Player, HLS.js, ExoPlayer) supports .webm or VP9 inside fragmented MP4 (fMP4). Hardware Acceleration — Ensure that encoders (e.g., NVENC, libvpx-vp9) and decoders are available on target devices for VP9. CDN Support — Confirm your CDN caches and serves .webm or fMP4 segments efficiently without MIME type or range-request issues. Prepare Source Files (H.264 Masters) Use the highest-quality H.264 mezzanine or intermediate files as sources. Avoid re-encoding already compressed delivery versions to prevent quality degradation over time. If your current library consists of fragmented MP4 segments, first remux them into a continuous file before transcoding. # Merge H.264 segments into a single file (if needed) ffmpeg -f concat -safe 0 -i input_list.txt -c copy merged_h264.mp4 Re-Encode to VP9 Encoding converts your prepared H.264 source into the VP9 codec. The recommended software encoder is libvpx-vp9, available through FFmpeg. Hardware encoders can be used when available, but software encoding generally offers finer control over compression parameters. ffmpeg -i merged_h264.mp4 -c:v libvpx-vp9 -crf 30 -b:v 0 -row-mt 1 -tile-columns 4 -threads 8 -pix_fmt yuv420p -an output_vp9.webm Explanation : -crf 30 -b:v 0 enables constant-quality, variable-bitrate encoding. -row-mt 1 and -tile-columns 4 enable multithreaded encoding for faster performance. -pix_fmt yuv420p ensures maximum playback compatibility. For multi-rendition streaming, generate multiple bitrates and resolutions: ffmpeg -i merged_h264.mp4 -c:v libvpx-vp9 -b:v 2500k -s 1920x1080 output_1080p.webm -c:v libvpx-vp9 -b:v 1200k -s 1280x720 output_720p.webm -c:v libvpx-vp9 -b:v 800k -s 854x480 output_480p.webm Update Packaging and Manifests Once VP9 files are encoded, they must be packaged into the correct container format and segmented for adaptive delivery. Two options are common: WebM packaging and CMAF (fMP4) packaging. Using WebM for DASH WebM is often used with the DASH streaming protocol. FFmpeg can generate both the media segments and the corresponding manifest. ffmpeg -i output_vp9.webm -f dash -dash_segment_filename seg_$Number$.webm manifest_vp9.mpd Using CMAF (fMP4) for HLS/DASH If your playback system or CDN expects MP4 segments, encode and segment using the CMAF standard. ffmpeg -i merged_h264.mp4 -c:v libvpx-vp9 -b:v 2000k -f dash -seg_duration 4 -use_template 1 -use_timeline 1 -init_seg_name init.mp4 -media_seg_name chunk_$Number$.m4s vp9_stream.mpd Integrate with Existing Players Players need to recognize VP9 content and automatically select it when supported. The following example shows how to configure Shaka Player to prefer VP9, while falling back to H.264 when VP9 is unavailable. player.configure({ preferredVideoCodecs: ['vp9', 'avc1'], streaming: { lowLatencyMode: true } }); Validate and Benchmark Run objective and subjective quality tests before full migration. Objective : Measure PSNR/SSIM between H.264 and VP9 versions to confirm equivalent quality. Subjective : Test playback on Chrome, Firefox, Safari, and Android devices for performance, latency, and buffering. Example SSIM Measurement : ffmpeg -i output_vp9.webm -i merged_h264.mp4 -lavfi ssim='stats_file=ssim.log' -f null - Record SSIM values above 0.98 to ensure parity with the H.264 source. CDN and Delivery Adjustments Ensure your CDN or origin supports byte-range requests and MIME types for WebM or fMP4. Use video/webm or video/mp4 depending on your packaging. Set appropriate caching headers and verify segment chunking alignment for adaptive bitrate (ABR) playback.