I'd be tempted to agree, __philippe -- sadly, on the very same day an update to FFmpeg v5.0-2 completely broke it in Termux for Android, causing more grief and frustration than I'd like to confess...
Update here: It's been said many times on these forums but ffmpeg is amazing. I used the following command borrowing from a Shotcut install on my computer, not far off from what Ruby posted about earlier in the thread. Just saved a batch file and the video to a folder. The conversion was near-instant and worked perfectly.
Midas wrote: ↑Thu Jun 16, 2022 4:03 pm
That is almost verbatim what I suggested two posts above...!?
Amusingly, I scoured the site for the original reference and thought -- based on keywords -- it was Ruby's post. I somehow completely missed the actual suggestion I took this from on the same thread. This is what happens when you take notes to post about something days or weeks later.