[Ffmpeg-devel] Re: [Ffmpeg-user] mmf formats

Baptiste Coudurier baptiste.coudurier
Thu Nov 16 10:31:55 CET 2006


Hi

Julien Youx wrote:
> mark a ?crit :
>> hi
>> i need to convert wav or mp3 files to "mmf' format files which is a ring
>> tone format for mobiles. does ffmpeg support this? can anyone point me in
>> the right direction for this?
> 
> Hi,
> I tested many combinations (frequencies bitrate, etc...), ffmpeg
> generates a file well, without error. A "ffmpeg -i file.mmf" gives well
> me the infos as what this file is mmf (audio Yamaha format), but this
> file is definitively wrong, which it is on softwares PC, or on mobiles
> phones.
> I thus concluded from it that ffmpeg cannot make mmf...
> 
> You can read this thread about mmf :
> http://thread.gmane.org/gmane.comp.video.ffmpeg.user/5712/focus=5753
> 

I just did a quick test, and it works well for mono output.

ffmpeg -i <sound.file> -ac 1 -ar 8000 test.mmf will gives correct output
afterwards.

It does not work at all with stereo sound though, is it a limitation of
ADPCM yamaha ?

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