[FFmpeg-user] Converting video + stereo to video + mono
Carl Eugen Hoyos
cehoyos at ag.or.at
Sat Apr 28 14:13:56 CEST 2012
Jason Heeris <jason.heeris <at> gmail.com> writes:
> I'm playing around with encoding video for HTML5, and I
> was wondering if converting the stereo audio to mono would
> have any real effect on size.
Only -ab (or -aq) has a real effect on size, I am not sure if
you can improve quality (but it should for real stereo input).
> So I tried using the "-ac 1" option in this invocation:
> ffmpeg -i Input.avi -vcodec libx264 -b:v 1000k -ac 1 Output.mp4
> ...but the resulting output still seems to have stereo audio.
Why do you think so?
Your console output reads:
Output #0, mp4, to 'Output.mp4':
Stream #0:1: Audio: aac (@ / 0x0040), 44100 Hz,
1 channels, flt, 128 kb/s
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