feat(Format): Add is_drc
#656
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YouTube is currently A/B testing Stable Volume on the website, it's been in the iOS and Android apps since summer 2023. The audio streams with stable volume, can be identified through the
is_drcproperty. DRC stands for Dynamic Range Compression. The WEB client has had Dynamic Range Compression on very specific videos for a long time, since before Stable Volume was a feature on mobile. Here is yt-dlp's test case for DRC streams (age-restricted): https://www.youtube.com/watch?v=Tq92D6wQ1mg (https://github.com/yt-dlp/yt-dlp/blob/master/yt_dlp/extractor/youtube.py#L2629)I'll be doing a follow-up pull request that adds support to the
toDashfunction to treat the DRC streams as a separate audio track.