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Brandon ThomasandClaude Opus 5.5
406706e3d5
- 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>
16 lines
1.1 KiB
Markdown
16 lines
1.1 KiB
Markdown
# effectcraft-vp9enc
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A small VP9 encoder for WebM export: every frame is a key frame (profile 0, 8-bit 4:2:0,
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BT.709), coded with 8×8 intra blocks (DC / V / H / TM prediction chosen per block), 4×4
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DCT/ADST transforms with default probabilities, or the Walsh–Hadamard transform at quality 100
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(mathematically lossless).
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Written from the **VP9 Bitstream & Decoding Process Specification, version 0.6 (31 March
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2016)**: the encoder emits the uncompressed and compressed headers (§6.2, §6.3), partition, mode
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info and token syntax (§6.4) and reconstructs with the specification's intra prediction (§8.5.1)
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and integer inverse transforms (§8.7) so it stays in step with any conformant decoder. The
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boolean encoder is the inverse of the §9.2 decoder in the form given in RFC 6386 §7.3. Spec
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tables (§10) were transcribed from FilmCraft's first-party decoder `filmcraft-vp9` (MIT OR
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Apache-2.0), which is also the decoder the tests round-trip through; ffmpeg is used only as an
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external test oracle. No libvpx or other third-party encoder/decoder source was consulted.
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