[FFmpeg-user] mono or stereo? ffmpeg converts or phone?
barsnick at gmx.net
Tue Apr 29 11:06:33 CEST 2014
On Mon, Apr 28, 2014 at 20:37:25 -0400, Sean Darcy wrote:
> 48000 bitrate with two channels, isn't that file size ~twice the file
> size of a mono 48000 bitrate?
No, not with compressed formats, unless your two audio channels carry
totally uncorrelated content. I'm saying compression can take advantage
of redundancies between the two channels.
And I don't agree with this concern of yours:
> My real question is: how does ffmpeg downmix 2 -> 1. I assume it
> doesn't just take one channel. Does it "average" in some way the two
> I also assume whatever ffmpeg does, it does it better the android
> code on a phone doing it in realtime.
Downmixing stereo to mono is usually just an average (yes, there are
other approaches), and both the complexity and the required compute
power are negligible.
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