Using ffmpeg with audio in a video?

Try to put -ac 2 after I vid1. Mp4, to set 2 audio channels on the output file.

Try to put -ac 2 after -i vid1. Mp4, to set 2 audio channels on the output file. As a general rule, options are applied to the next specified file.

Thanks for that - tried it already before and after! Didn't work either way same error - any other ideas? – user7289 Jul 8 '10 at 19:16.

I ended up transcoding without the sound and it worked.

Try to put -ac 2 after -i vid1. Mp4, to set 2 audio channels on the output file.

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