[FFmpeg-user] 5.1 sound aac
adamklobukowski at gmail.com
Mon Nov 21 18:51:35 CET 2011
I'm reencoding 5.1 sound from ac3 to aac. I have it scripted to reencode
a lot of different videos.
I use ffprobe to get source bitrate, and use it for output bitrate.
So, with source audio bitrete reported as 384k I reencode it like this:
ffmpeg -threads 4 -i video.mkv -vcodec copy -acodec aac -ab 384k -strict
experimental -f mp4 video.mp4
But, it is wrong. I'n fact, with 5.1 sound bitrate is divided per
subchannel, so effective bitrate is much lower (and it can be heard).
There are 2 possibilities:
1. ffprobe reports wrong bitrate
2. ffmpeg uses wrong bitrate
3. I'm wrong and do not understand what it all means.
Which one is true?
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