New issue 83 by bon...@gmail.com: Problem setting CBR AAC encoding with  
some assets
http://code.google.com/p/ffmbc/issues/detail?id=83

When we create H.264/AAC MP4 files we require the audio to be 96Kbps CBR.

We use this command line:
ffmbc -i P2_DVCProHD_1080p_10sec.mov -f mp4 -vf scale=400:226 -vcodec  
libx264 -b 800k -maxrate 800k -bufsize 5097k -r 25 -map_audio_channel  
0:1:0:0:1:0 -map_audio_channel 0:2:0:0:1:1 -ab 96k -ar 48000 -ac 2 -acodec  
libfaac -y web-P2.mp4

We run the output through Mediainfo and it says:
Bit rate mode                    : Constant
Bit rate                         : 96.0 Kbps

However, for a different asset with the same command line it reports:
Bit rate mode                    : Variable
Bit rate                         : 73.5 Kbps

The problem asset is a mov-wrapped AVC-Intra with PCM audio.

I'll drop you an email with links to the assets we used.

Thanks, Darren.

Comment #1 on issue 83 by bon...@gmail.com: Problem setting CBR AAC  
encoding with some assets
http://code.google.com/p/ffmbc/issues/detail?id=83

Hi Baptiste, any input on this please?

Thanks, Darren.

Comment #2 on issue 83 by baptiste...@gmail.com: Problem setting CBR AAC  
encoding with some assets
http://code.google.com/p/ffmbc/issues/detail?id=83

I have no idea yet, I'll have a look

Comment #3 on issue 83 by baptiste...@gmail.com: Problem setting CBR AAC  
encoding with some assets
http://code.google.com/p/ffmbc/issues/detail?id=83

This problem is related to faac. I cannot fix.