TIL: The mediainfo command (apt install mediainfo) will show you the codecs used by the audio and video in a file. Very useful if you have a .webm and it doesn't play in Jellyfin - for me most of the time it's the lack of AV1 support in iOS which means I have to convert using a command like:
ffmpeg -i input.webm -c:v libx264 -crf 20 -preset medium -c:a copy output.mp4
Although file size went from 650MB to 2.5GB!
@pwaring I went through the same thing for exactly the same reason (Sandra's iPhone), and the increase in size just for that was immense...
@neil @pwaring
ffmpeg does that. There are commands generating smaller size too.
https://ffmpeg.run/posts/how-to-compress-video-file-size-ffmpeg
(Site is AI made btw).
A slightly older answer, but does help: https://superuser.com/questions/960431/what-ffmpeg-command-would-convert-a-video-for-ipad-iphone-ipod (use alt frontend for accessing this pls).
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