Howto know the fps of a youtube video ?

[hafuz]

Hi, Thanks for the wonderful work !
I need to know the fps of a youtube video to use it in a script based on youtube-dl.
It is not possible ( for now ;) !!) to get this info by youtube-dl
It will be great to add an option to display it !

If someone can help me to have the fps info simply...
Thanx

[jaimeMF]

You can use ffprobe: ffprobe -print_format json -show_streams THE_VIDEO.mp4 and look for r_frame_rate or avg_frame_rate (I don't know the difference between them).
youtube-dl doesn't know the fps of the youtube videos, I think we shouldn't add an option for getting it (since that can be done with ffprobe).

[hafuz]

Thank you for that answer,
But i want just know the fps before downloading the video.
The bash script is based on a pipe like
' youtube-dl --max-quality mp4 -o - "linktoyoutubevideo" | ffmpeg ..'
because it's faster than download the video and then encode it. I want to know the fps to calculate the duration of the encode. This exclude ffprobe and that's why i think an option in youtube-dl would have been cool. I think, we could find it in the output of "--get-description" option.
Regards.

[jaimeMF]

The problem is that for getting the fps before downloading the file, we would need that youtube provided it, otherwise (I think) there's no way of getting it.

[hafuz]

Ok, i understand. I thought youtube provided this info.
Is it possible to download a limited length part (ex: the very begining ) of the video which contain the infos.

[jaimeMF]

For YouTube videos some formats have fps info now , you can get them from the fps field in the json output (using jq):

$ youtube-dl -j test:youtube | jq .fps
30

Therefore I'm closing the issue.