[FFmpeg-user] PCM wrapped AC3 to 6 channel discrete

Carl Eugen Hoyos cehoyos at ag.or.at
Fri Aug 15 15:36:00 CEST 2014

Kurt Schroeder <tech <at> comstar.org> writes:

> Here is a 30sec clip for testing, it's 165.51MB.

Thank you for the sample!

I consider the following dark magic, it produces an 
ac3 file that FFmpeg can decode but shows many 
$ ffmpeg -i NOVA04012HDBA2x.mov -filter "channelmap=map=2-0|3-1" 
-f s16be out.ac3

The ac3 file is stereo though, I would be very 
surprised if it actually contains multichannel audio...

I don't know anything about professional television 
transmissions, can you explain what this is / what 
produces it / what uses it?

Thank you, Carl Eugen

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