[FFmpeg-user] problem when trying to convert a video for a copy of it self

Carl Eugen Hoyos cehoyos at ag.or.at
Mon Mar 31 17:27:13 CEST 2014

Sonia Alves <sonia.p.alves <at> hotmail.com> writes:

> ffmpeg -i Oscars.mp4 -f mp4 -vcodec copy -acodec copy 
> -s 640x360 Oscars2.mp4

This command line makes no sense:
-vcodec copy tells FFmpeg not to decode and (re-) encode 
video but to remux the video stream. You cannot change 
the resolution when remuxing but that is what you 
request with -s.

When asking for help here, always post your command line 
together with the complete, uncut console output.
(And please don't forget not to top-post.)

Carl Eugen

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