Add VP9 as a valid HLS format to enable remuxing. This is useful when audio processing is required, but the VP9 video can be passed as-is to avoid unnecessary video transcoding.
No VP9 encoder is enabled and should not be enabled. AV1 and HEVC should be preferred over VP9 if video transcoding is required.
Signed-off-by: gnattu <gnattuoc@me.com>
Apple doesn't support Opus via HLS yet, but if they ever do, they will
definitely expect "Opus" instead of "opus".
See https://mp4ra.org/#/codecsFixes: #10066
I moved the first application of the workaround out of the if block
so that it also applies to audio-only streams. The workaround was
extended likewise.
We should first and foremost adhere to the specifications and apply
workarounds afterwards for software that doesn't follow them. So I
turned around the workaround to first output the fLaC variant and then
the alternative flac variant.
Fixes: #10066
