[FFmpeg-user] MP3 enconding bitrate

Paulo Fidalgo paulo.fidalgo.pt at gmail.com
Thu Oct 23 09:30:07 CEST 2014


I understand your point, but encoding with lame, instead of ffmpeg 
results in a file which don't pass the 320 Kbps. Also in the 
documentation we have a table of equivalence between ffmpeg and lame 

which will induce the users in error because those settings are not 
really equivalent.

Also if I lower the quality setting I'll have the problem anyway...

For reference there is a note in wikipedia in bitrate section:


/Non-standard bit rates up to 640 kbit/s can be achieved with the //LAME 
<http://en.wikipedia.org/wiki/LAME>//encoder and the freeformat option, 
although few MP3 players can play those files. According to the ISO 
standard, decoders are only required to be able to decode streams up to 
320 kbit/s//^<http://en.wikipedia.org/wiki/MP3#cite_note-50> //

I think I will open a  bug report and try to listen the developers 
opinion on the subject.

Best regards,

Paulo Fidalgo

On 22/10/14 20:23, Bob Maple wrote:
>> I have trouble to get the mp3 encoded right to play on my Volvo
>> Infotainment System (Sensus 3.0), so I have contacted the costumer
>> support, and they told me that the files are being encoding with frames
>> with more than 320Kbps of bitrate.
>   [...]
>> I've encoded with this command:
>> ffmpeg -i 2L38_01_96kHz.flac -codec:a libmp3lame -qscale:a 0
>> 2L38_01_96kHz.mp3
> You're using a qscale of 0 which is like saying "use ALL of the bits!"
> Raise the q or use -b:a to set a sensible bitrate ilke -b:a 192k
> (opinions vary)
> _______________________________________________
> ffmpeg-user mailing list
> ffmpeg-user at ffmpeg.org
> http://ffmpeg.org/mailman/listinfo/ffmpeg-user

More information about the ffmpeg-user mailing list