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  1. 16th Jun 2017 14:33 #1
    brassplyer
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    At one time HD audio got treated differently than non-HD. Then I see references from a few years ago saying that was changed so that all audio was the same. Anyone know what the current standard is?
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  2. 16th Jun 2017 14:42 #2
    sneaker
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    Best quality is probably Opus @160k and should be provided for all videos irregardless of resolution. Depending on your client device and connection speed other audio streams (lower bitrate and/or aac or mp3 or vorbis) may be served.

    If you want to check:
    youtube-dl -F [youtube_url]

    To further check a stream download it and analyze using e.g MediaInfo.

    (youtube-dl guide)
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