[FFmpeg-user] Stream specifier ':a' in filtergraph Error

andrei ka andrei.k.gml at gmail.com
Wed Nov 11 22:30:21 EET 2020

> You could check those videos with FFprobe. May be they have no audio
> stream, or something else is different.

ffmpeg would be enuf, ffmpeg would list all the tracks in input files
before starting transco, on failure dude should just check his first
20lines of log to see if mp4 have snd tracks...


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