OUT-2: WebM export (VP9 intra encoder + alpha, Opus), WAV/AIFF audio-only outputs
- effectcraft-vp9enc (L0): VP9 profile 0 key-frame encoder from the VP9 bitstream spec
(8x8 intra blocks, DC/V/H/TM, 4x4 DCT/ADST, lossless WHT at quality 100, tile columns);
round-trips exactly through FilmCraft's VP9 decoder and ffmpeg.
- export: WebM muxer (EBML/Matroska spec) with VP9, VP9 alpha in BlockAdditional
(AlphaMode 1), Opus (CodecDelay = pre-skip); WAV and AIFF outputs.
- OutputFormat WebM/Wav/Aiff in the Render Queue, renderQueue.add formats, CLI --format.
- Tests: FilmCraft decode-back (frames, size, pixels, audio RMS), ffprobe/ffmpeg oracles.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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