[FFmpeg-user] Downmixing with low frequency channel

Marton Balint cus at passwd.hu
Fri May 30 22:01:39 CEST 2014

On Fri, 30 May 2014, Marcin Czosnek wrote:

> Hey!
> I want to downmix some 2.1, 3.1, 4.1, 5.1, 7.1 music samples to stereo.
> I have used -ac 2 option but it discards LFE and I want to keep it. How
> should I do it? should I use pan filter? How the formula should look like?

I have not tried, but I believe ffmpeg is parsing swresample options 
as well, so you can explicitly set the -lfe_mix_level of swresample by 
setting it in the ffmpeg command line.


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