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[GH-ISSUE #570] youtube: use opus audio format with av1 format & put it in webm container #9158
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Reference: github-starred/cobalt#9158
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Originally created by @sakurayz on GitHub (Jun 12, 2024).
Original GitHub issue: https://github.com/imputnet/cobalt/issues/570
MP4 (H264+AAC) format is used for resolutions below 1080p, and WebM (VP9/AV1+OPUS) format is used for high-resolution (4k/8k)videos. The sound quality of the AAC format on the YouTube website is lower than that of the OPUS format. av1+aac combo MP4 feels a bit strange 😜
@github-account1111 commented on GitHub (Apr 14, 2026):
Citation needed.
In general, AAC is on par or slightly better than Opus for music and on par or slightly worse than Opus for speech. Being an Apple-backed format, AAC also has far better compatibility, about on par with that of MP3.
Given that most YouTube downloads are either music or mixed content, I think it would make the most sense to pair all three video codecs with AAC, not just H264.