[FFmpeg-devel] MPEG Audio encoding
Fri Jan 25 12:59:46 CET 2008
On Fri, Jan 25, 2008 at 10:51:13AM +0100, John Sigler wrote:
> [ This message was originally posted to ffmpeg-user ]
you want to send a patch? if not its the wrong list ...
> I have a few questions concerning the MPEG Audio encoder in ffmpeg.
> ( mpegaudioenc.c )
> (I've been reading the corresponding Wikipedia articles.)
> AFAICT mpegaudioenc.c implements MPEG-2 Layer II (i.e. MP2).
> Is there support for MPEG Audio Layer I in libavcodec?
why do you want "mp1" ?
> On a related subject, the Wikipedia article states:
> The format is based on successive digital frames of 1152 sampling
> intervals with four possible formats:
> * mono format
> * stereo format
> * joint stereo format (stereo irrelevance)
> * dual channel (uncorrelated) format
> And mpegaudio.h defines
> #define MPA_STEREO 0
> #define MPA_JSTEREO 1
> #define MPA_DUAL 2
> #define MPA_MONO 3
> But joint stereo and dual mono do not seem (??) to be supported by
> the encoder. Is that correct?
could be, if so send a patch implementing them!
> Were joint stereo and dual mono actually defined for Layer II,
> or did they only show up later in Layer III?
greping the draft ...
"Joint Stereo coding can be added as an additional feature to any of the
I suggest you read it yourself next time instead of asking. You will
have to read it anyway to implement it and send a patch.
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
If you really think that XML is the answer, then you definitly missunderstood
the question -- Attila Kinali
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