[FFmpeg-user] MP3 enconding bitrate

Paulo Fidalgo paulo.fidalgo.pt at gmail.com
Thu Oct 30 09:05:22 CET 2014

On 28/10/14 10:55, Carl Eugen Hoyos wrote:
> On Monday 27 October 2014 08:36:37 pm Paulo Fidalgo wrote:
>> On 27/10/14 00:04, Carl Eugen Hoyos wrote:
>>> Paulo Fidalgo <paulo.fidalgo.pt <at> gmail.com> writes:
>>>> After making another test with lame and ffmpeg
>>> Please test the following:
>>> $ lame -V 0 -q 0 2L38_01_96kHz.wav 2L38_01_96kHz-lame-V0.mp3
>>> $ ffmpeg -i 2L38_01_96kHz.wav -compression_level 1 -q:0 0 out.mp3
>> The file created by lame works, although the ffmpeg don't.
> Hmm.
> Is the problem related at all to "-q:0" or is it also reproducible
> if you specify a bitrate (or neither bitrate nor quality)?
When I try to encode with 320k I see this message at the begining:
size=    6626kB time=00:02:49.58 bitrate= 320.9kbits/s

I've tried with 320k and 256k and both files don't play.

>> If there's something I can do to further investigate please let me know.
> You could ask Volvo again (as said, the bitrate is not >320 for any frame)
> but I wonder now if you shouldn't just use -write_xing 0 or -id3v2_version 3.

I can't use this option (-write_xing) nor I can't found in 
documentation: https://www.ffmpeg.org/ffmpeg-all.html

And it don't make any difference to use -id3v2_version 3 flag.

> Carl Eugen
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