When I use ffmpeg to convert an audiofile with the option
-acodec libfaac -ab 192k
and use
ffmpeg -i
on that file afterwards to get the audio file information, it tells me
bitrate: 152 kb/s
Why ist this? Do I miss something here? If I want to convert a file with a bitrate of 192kb it should give me 192 kbit after the conversion, shouldn't it?
Or: How do I get the 192 kbit rate then?
Best Answer
There are now much better aac encoders for Linux such as NeroAacEnc or fdkaac but if you are still keen on using faac there is a patch that means faac can encode with a bitrate of 192k, and a great deal higher as well. Handbrake formerly used this patch and hosted it on their site but the developers have dropped faac support now, I now host the patch here:
http://www.andrews-corner.org/patches/A00-bitrates.patch
Patch Faac and then compile FFmpeg with --enable-libfaac and you can have high bitrate aac files with Faac. Here is a sample encode with the patched faac, encoding directly with faac:
And it works as well with FFmpeg. But there are definitely better aac encoders out now...
References: