[FFmpeg-devel] [PATCH] Prevent user from setting -vol and -acodec copy.

[Ramiro Polla]

Hello,

For a command line like this:
./ffmpeg_g -i input.wav -acodec copy -vol 1024 -y output.wav

FFmpeg segfaults trying to preprocess audio volume in output_packet(). 
Since there is no decoding, samples is NULL and any attempt to read them 
segfaults.

Attached patch prevents user from setting the volume and -acodec copy 
the same way it's done with vhooks and -vcodec copy.

Ramiro Polla
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