• Compression Techniques

  Audio channel fill

  Posted by Simon Davis on November 21, 2010 at 8:45 pm

  Hi,

  I have lots of video with quality audio in the left channel only and distortion in the right channel. I would like to be able to us the left channel audio only when converting. using ac1 converts to mono but this includes the distortion. Is there a way to replicate the “fill left” functionality you get in some video editing applications so that the left channel audio is replicated in both channels in the converted video?

  Thanks,

  Simon

  Michael Rampe replied 15 years, 6 months ago 2 Members · 3 Replies
• 3 Replies

• 

  Michael Rampe

  November 21, 2010 at 11:47 pm

  If it is one stereo “stream” it is not currently possible.

  If there are two discrete mono “streams”, it is possible with the map command.

  To find out which you have, perform an input read and post the results. (eg. ffmpeg -i yourfile.mp4)

  Michael
• 

  Simon Davis

  November 22, 2010 at 4:39 pm

  Hi Michael,

  looks like audio is in one stereo stream at the moment so sounds like it might not be possible? Shame because the info is definitely there and editing apps such as premiere can perform this task. Any alternatives that will look at channels in a stereo stream?

  Thanks a lot for the input,

  Si
• 

  Michael Rampe

  January 19, 2011 at 11:15 pm

  Try sox.

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