Format Selectors for Twitch.tv

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If the purpose of this issue is a site support request please provide all kinds of example URLs support for which should be included (replace following example URLs by yours):

• Twitch Stream: https://www.twitch.tv/geekandsundry

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Description of your issue, suggested solution and other information

Format for youtube format selection doesn't seem to work for twitch.

For example currently my format options are:

ytdl-format=bestvideo[height<=?480][fps<=?30][vcodec!=?vp9]+bestaudio/best

These work great on youtube however when using these with twitch it seems to always select the highest quality stream available.

youtube-dl -F https://www.twitch.tv/geekandsundry
[twitch:stream] geekandsundry: Downloading stream JSON
[twitch:stream] geekandsundry: Downloading channel access token
[twitch:stream] geekandsundry: Downloading m3u8 information
[info] Available formats for 27979143888:
format code     extension  resolution note
audio_only      mp4        audio only  129k , mp4a.40.2
160p            mp4        284x160     230k , avc1.77.31, mp4a.40.2
360p            mp4        640x360     630k , avc1.77.31, mp4a.40.2
480p            mp4        852x480    1395k , avc1.77.31, mp4a.40.2
720p            mp4        1280x720   2340k , avc1.77.31, mp4a.40.2
1080p__source_  mp4        1920x1080  3686k , avc1.640028, mp4a.40.2 (best)

Removing the 'bestvideo' and 'bestaudio/best' pieces seems to work for twitch so I was just curious if anyone was familiar with why the above settings work for youtube but not twitch.

youtube-dl --get-format -f "bestvideo[height<=?480][fps<=?30][vcodec!=?vp9]+bestaudio/best" https://www.twitch.tv/geekandsundry
1080p__source_ - 1920x1080
youtube-dl --get-format -f "[height<=?480][fps<=?30][vcodec!=?vp9]" https://www.twitch.tv/geekandsundry
480p - 852x480

[thisSIDEofRANDOM]

I think this might be solved by doing something like
"(bestvideo+bestaudio/best)[height<=?480][fps<=?30][vcodec!=?vp9]"

But was hoping to get others thoughts on this. Is the issue here that twitch has no audio only formats so its always picking the highest quality stream as the best "audio" format?

[thisSIDEofRANDOM]

Closing as reading documentation better helped me get what I needed.

Since twitch doesn't have a good way to gauge FPS on videos going by a combination of the above and also tbr helped me get a good balance for youtube/twitch without destroying my CPU for streamers with insane quality settings.