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

Nicolas George nicolas.george at normalesup.org
Mon Jun 17 09:47:59 CEST 2013

L'octidi 28 prairial, an CCXXI, Gonzalo Garramuño a écrit :
> I am on windows using zeranoe builds. I am using swresample.  I have
> the following:
> 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 channel.

Can you reproduce the problem using the ffmpeg command-line tools? I just
tried and the conversion works as expected.

> The sample I am using is m4 large of channel check from:
> http://www.dolby.com/us/en/consumer/technology/home-theater/dolby-digital-plus-download.html

How can they make something so simple so useless?


  Nicolas George
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