Issue 83 in ffmbc: Problem setting CBR AAC encoding with some assets

[ff...@googlecode.com]

Status: New
Owner: ----
Labels: Type-Defect Priority-Medium

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.

[ff...@googlecode.com]

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.

[ff...@googlecode.com]

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

[ff...@googlecode.com]

Updates:
Status: Invalid

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.