f264befe86
This PR is an extension of the full AV1 codec string feature: [PR 1205](https://github.com/shaka-project/shaka-packager/pull/1205) and relates to [Issue 1007](https://github.com/shaka-project/shaka-packager/issues/1007) and [Issue 1202](https://github.com/shaka-project/shaka-packager/issues/1202). As per the AV1 spec, the codec string may contain optional color values. These color values are critical for detecting HDR video streams - see [Issue 1007](https://github.com/shaka-project/shaka-packager/issues/1007). Color information is extracted from the input mp4's `colr` atom and used to generate the full AV1 codec string. This PR preserves the color information by writing the `colr` atom to the muxed mp4. **References**: - [AV1 Codec ISO Media File Format Binding](https://aomediacodec.github.io/av1-isobmff/#codecsparam) - [AV1 Bitstream & Decoding Process Specification - Section 6.4.2 Color config semantics (page 117)](https://aomediacodec.github.io/av1-spec/av1-spec.pdf) - [QuickTime File Format Specification](https://developer.apple.com/library/archive/documentation/QuickTime/QTFF/QTFFChap3/qtff3.html#//apple_ref/doc/uid/TP40000939-CH205-125526) |
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