c3df2a24e5
* Add custom quality factors and quantizer bitrate mode (closes #327) * Fix quantizer mode fallback and per-frame quantizer edge cases * Clean up quantizer mode tests * Quantizer implementation * Add quality tests * Improve conversion codec error message, make test more lenient * Add quantizer support blog post --------- Co-authored-by: Vanilagy <[email protected]>
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description
| description |
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| High Efficiency Video Coding (H.265) video codec definition, defining legal codec strings, decoder configs, and packet data formats. |
HEVC (H.265) codec registration
Description
The High Efficiency Video Coding (H.265) video codec, specified in Rec. ITU-T H.265 / ISO/IEC 23008-2.
An HEVC bitstream can have either of two formats:
- Canonical (length-prefixed), as defined in ISO/IEC 14496-15 Section 8.3.2. Here, video parameter sets (VPS/SPS/PPS) are provided out-of-band.
- Annex B, as defined in Rec. ITU-T H.265 Annex B. Here, video parameter sets (VPS/SPS/PPS) must be provided in-band in the respective NALUs.
All packets within the bitstream must have the same format.
Codec ID
'hevc'
EncodedPacket data
The packet's data must be an access unit as defined in Rec. ITU-T H.265 Section 7.4.2.4, containing exactly one base layer coded picture, in either canonical or Annex B format.
EncodedPacket type
If the packet's type is 'key', then the packet is expected to contain an IDR, CRA, or BLA picture. Additionally, if the bitstream's format is Annex B, then this packet is also expected to contain the necessary video parameter sets to initialize the decoder.
VideoDecoderConfig codec string
The full codec string begins with the prefix 'hev1.' or 'hvc1.', with a variable-length suffix of four dot-separated fields as specified in Section E.3 of ISO/IEC 14496-15.
VideoDecoderConfig description
If the bitstream is in the canonical (length-prefixed) format, description must be an HEVCDecoderConfigurationRecord as defined in ISO/IEC 14496-15 Section 8.3.3.1.
If the bitstream is in the Annex B format, description must be undefined.
Quantizer range
HEVC has quantizer support and supports quantizer values in the range [0, 51].