Speex dev - Aug 2010 - Speex encoded stream in mp4

Hi,
    Is that possible to store a speex encoded audio track in the
standard .mp4 container file format? If yes, which tool I can use to
do that? I found FFMPEG does not include the support of speex codec.
Thanks.

Regards.

Weikai Xie

On Wed, Aug 18, 2010 at 7:00 AM, Weikai Xie <xiewk at 126.com>
wrote:
> Hi,
> ? ?Is that possible to store a speex encoded audio track in the
> standard .mp4 container file format? If yes, which tool I can use to
> do that? I found FFMPEG does not include the support of speex codec.
> Thanks.
I had to add special hook into erlyvideo to dump speex into mp4, but
resulting file is readable only by erlyvideo.

Weikai Xie wrote:
> Hi,
>     Is that possible to store a speex encoded audio track in the
> standard .mp4 container file format? If yes, which tool I can use to
> do that? I found FFMPEG does not include the support of speex codec.
> Thanks.
MP4 only supports specific codecs, but you can probably write to MOV,
which is similar, using Microsoft WAVE tags.  I believe the tag for
Speex is 0xA109.  But even then, very few (if any) programs could
recognize it.

There is a patch on ffmpeg-devel for using FFmpeg to encode Speex via
libspeex.  Also, an entry would have to be added for the Speex codec id
in the ff_codec_wav_tags table in libavformat/riff.c in order to write
to MOV.

Hope that helps.

-Justin