I'm trying to convert a file with 7 channel audio (6.1 DTS) to 5.1 AC3 with command line ffmpeg, but I get this error:
This is the line I'm using:Code:Input stream #0.1 frame changed from rate:48000 fmt:s16 ch:7 to rate:48000 fmt:s16 ch:6 Resampling with input channels greater than 2 unsupported. Can not resample 6 channels @ 48000 Hz to 6 channels @ 48000 Hz
I also tried using MKVTools (mac) for the hell of it and it clearly didn't work as it said the audio conversion was done in a half second.Code:ffmpeg -i file.mkv -acodec ac3 -ac 6 -ar 48000 -ab 640k -vcodec copy file.m4v
Any ideas? Thanks in advance!
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On a Mac, I don't know of any 1 click free tools that will let you do this, will probably be a manual process.
Doing this manually. You would need to de-mux the audio stream to 7 separate tracks, then combine/convert Front, rear and LFE channels into a 5.1 AC3. I don't know which tools that will allow you to do this on a Mac.
If you are using and Intel based Mac you could do a dual boot and install a version of windows and use E-ac3 to convert the file.Murphy's law taught me everything I know. -
Why are you "resampling" from 48000 Hz to 48000 Hz? The error message clearly states that ffmpeg has a problem with this. I'm not an ffmpeg expert but I'd guess that dropping "-ar 48000" from your command would be at the minimum a step in the right direction if not a complete fix for the problem.
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