audio encoding with ffmpeg | sox | ffmpeg

cameris · 14th October 2009, 15:35

Hi,

I have a problem to encode audio tracks in my encoding script. It uses ffmpeg to encode to aac and for 5.1 tracks also sox to get the channel order right. I have tested it on a couple of tv-series (longest was 45 min) and everything has worked great.
But now I have tested it on some full featured movies and on every 5.1 audio track it hangs aroung 80MB (output file, bitrate: 128k) and I dont have a clue why. It doesnt give a error message neither quits, it just stops doing anything.

The command for 5.1 looks like this:

Code:

ffmpeg -i $input -async 1 -vsync 1 -v 0 -map $map -vn -sn -ac 6 -acodec pcm_s16le -ar $afreq -f wav - | \
sox -t raw -s -2 -c 6 -r $afreq - -t wav - remix -m 6 5 1 2 3 4 | \
ffmpeg -i - -ac 6 -v 0 -y -acodec libfaac -ab $audioquality $audiofile

Has anybody has an idea why?

14th October 2009, 15:35	#1 \| Link
cameris Registered User Join Date: Oct 2009 Posts: 3	audio encoding with ffmpeg \| sox \| ffmpeg Hi, I have a problem to encode audio tracks in my encoding script. It uses ffmpeg to encode to aac and for 5.1 tracks also sox to get the channel order right. I have tested it on a couple of tv-series (longest was 45 min) and everything has worked great. But now I have tested it on some full featured movies and on every 5.1 audio track it hangs aroung 80MB (output file, bitrate: 128k) and I dont have a clue why. It doesnt give a error message neither quits, it just stops doing anything. The command for 5.1 looks like this: Code: ffmpeg -i $input -async 1 -vsync 1 -v 0 -map $map -vn -sn -ac 6 -acodec pcm_s16le -ar $afreq -f wav - \| \ sox -t raw -s -2 -c 6 -r $afreq - -t wav - remix -m 6 5 1 2 3 4 \| \ ffmpeg -i - -ac 6 -v 0 -y -acodec libfaac -ab $audioquality $audiofile Has anybody has an idea why?