[Libav-user] Audio 5.1 downsample to stereo broken in swresample?

Gonzalo Garramuño ggarra13 at gmail.com
Mon Jun 17 02:17:40 CEST 2013

I am on windows using zeranoe builds. I am using swresample.  I have the 
5.1(side), channels 6, format fltp, sample rate 48000
converting to:
stereo, channels 2, format s16, sample rate 48000

The result is that I hear in my viewer: the left channel, the center 
channel, the left surround channel, the subwoofer (?) channel.
However I hear nothing of either the right channel or the right surround 

The sample I am using is m4 large of channel check from:

For your info, ffplay plays the file correctly, but it does not use 
swresample by default (and I don't know how to force it to).
Thanks for your patience and help in this matter.

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