AV1 WebCodecs Registration

1. Fully qualified codec strings

The codec string begins with the prefix "av01.", followed by a variable length suffix as described in Section 5 of [AV1-ISOBMFF].

2. EncodedVideoChunk data

EncodedVideoChunk [[internal data]] is expected to be data compliant to the "low-overhead bitstream format" as described in Section 5 of [AV1].

3. VideoDecoderConfig description

description is not used for this codec.

4. EncodedVideoChunk type

If an EncodedVideoChunk's [[type]] is key, then the EncodedVideoChunk is expected to contain a frame with a frame_type of KEY_FRAME as defined in Section 6.8.2 of [AV1].

5. VideoEncoderConfig extensions

partial dictionary VideoEncoderConfig {
  AV1EncoderConfig av1;
};

av1, of type AV1EncoderConfig

Contains codec specific configuration options for the AV1 codec.

5.1. AV1EncoderConfig

dictionary AV1EncoderConfig {
  boolean forceScreenContentTools = false;
};

forceScreenContentTools, of type boolean, defaulting to false

Indicates whether the encoder should force use of screen content coding tools. The default value (false) indicates that use of screen content coding tools is not forced. A value of true (corresponding to setting seq_force_screen_content_tools to SELECT_SCREEN_CONTENT_TOOLS in Section 5.5.1 of [AV1]) indicates that use of screen content coding tools is forced.

6. VideoEncoderEncodeOptions extensions

partial dictionary VideoEncoderEncodeOptions {
  VideoEncoderEncodeOptionsForAv1 av1;
};

av1, of type VideoEncoderEncodeOptionsForAv1

Contains codec specific encode options for the [AV1] codec.

6.1. VideoEncoderEncodeOptionsForAv1

dictionary VideoEncoderEncodeOptionsForAv1 {
  unsigned short? quantizer;
};

quantizer, of type unsigned short, nullable

Sets per-frame quantizer value. In [AV1] the quantizer threshold can be varied from 0 to 63

7. Privacy Considerations

Please refer to the section Privacy Considerations in [WEBCODECS].

8. Security Considerations

Please refer to the section Security Considerations in [WEBCODECS].