Add VP9/webm support and allow audio codec selection about ffmpeg4discord HOT 2 CLOSED

@RollingStar Do you have any suggestions for speeding up a vp9 encoding job? I'm trying with a lot of different parameters, but the speed is bumming me out.

When I had webm a while back, I used this configuration, and now I'm messing with various flags in my most recent commit, and it's running at 0.2x at best. Well, I used "deadline":"realtime" and "cpu-used":"8", and it processed at 2x speed, but the quality was just like x264, which I feel defeats the purpose.

Or should I just work towards adding it and warn people that it takes forever.

I am writing this on my M2 MacBook, so maybe it will perform better on my Windows desktop. Would love to hear your thoughts.

from ffmpeg4discord.

I don't know a lot about vp9. 0.2x doesn't sound that bad to me for a newer encoder. Remember that h264 goes back to the early 2000s, this is a newer codec.

From my reading, vp9s alleged benefits are >1080p and (can't find a source for this) animation/games. I believe AV1 is a descendant of VP9 so you may be able to infer some benefits there.

And for 1080p+ or grainy contents, VP9’s performance is close to HEVC. In certain conditions, VP9 performs even better than HEVC.

If I'm sharing a clip and trying to cram into the 25MB limit I might want to wait for a slow (ish) encode and get the max quality allowed in that size.

https://www.red5.net/blog/6-points-of-comparison-for-vp9-or-h265/

https://www.reddit.com/r/VP9/comments/9ivm98/useful_sources_for_getting_started_with_vp9/

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