Firefox missing codecs again

After a succesful build of my custom FreeBSD desktop, the firefox "overlay module" that I included stopped playing particular Youtube video formats. This happens a lot after version upgrades but the CLI output explains nothing this time.
Is there any way to make Firefox tell what's going on beside the "can't play" screen message?
Also, are the exact dependencies of a default Firefox build with all functions supported known? The portstree doesn't check all functionality that could need additional ports. It can still crash on missing components.
 
did you check under whether the extensions for the video format is installed?
How? It doesn't tell what it's missing. Some Youtube videos don't work without further information.
How do I find out the format of a video? That would be useful too.
 
If you can download a video with yt-dlp (which, for the moment, needs to be run as
Code:
yt-dlp <url> --extractor-args "youtube:player-client=web_embedded,web,tv"
you can then run, on the downloaded video
Code:
ffmprobe -hide_banner <videoname>

Assuming that you have yt-dlp and ffmpeg installed.
 
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