[FFmpeg-devel] Fwd: Interested in NEW Seeking API of GSoC09

[zhentan feng]

Hi

2009/3/21 Daniel Verkamp <daniel at drv.nu>

> On Fri, Mar 20, 2009 at 9:03 PM, zhentan feng <spyfeng at gmail.com> wrote:
> > Hi
> >
> > This is a forward mail from ffmpeg-soc list without reply and forgive me
> > repost it here.
> > If the qualification task is necessary, I'll choose "Implement a Vivo
> > demuxer for ffmpeg" as a qualification task.
> >
> > ---------- Forwarded message ----------
> > From: zhentan feng <spyfeng at gmail.com>
> > Date: 2009/3/20
> > Subject: Interested in NEW Seeking API of GSoC09
> > To: FFmpeg Google SoC list <ffmpeg-soc at mplayerhq.hu>
> > Cc: Baptiste Coudurier <baptiste.coudurier at smartjog.com>
> >
> >
> > hi,
> >
> > My name is zhentan feng, and I am a student from china.
> > I have finished last year's soc project MXF muxer mentored by Baptiste.
> >
> > This summer, I plan to apply a soc project of ffmpeg again, and i am
> > interested in the NEW Seeking API project.
> > should I start from qualification task again or beginning to collect
> > information for the new project?
> >
> > sincerely yours
> > zhentan feng
> > --
> > Best wishes~
>
> Hi,
>
> I was playing around with writing a Vivo demuxer myself, but it
> currently doesn't work; attached is the (horribly messy) work so far.
>
> I'm not sure if it's actually working, but feeding the supposedly
> H.263 video stream from any of the samples to ffmpeg's decoder results
> in a bunch of nasty error messages about various invalid values; this
> could be because my code is broken (likely :) or because the video is
> not actually standard H.263 (also possible; anyone have more
> information?).  The mplayer demuxer uses the binary Win32 codecs to
> decode both the video and audio, so it's not too much help here.
>
> FFmpeg also doesn't currently support either of the possible audio
> codecs (G.723 and Siren), so I can't check if those work either.
>
> I'm probably not going to work on it any more unless someone's got a
> revelation about the H.263 problems, so feel free to do what you want
> with it...
>
> Thanks,
> -- Daniel Verkamp
>
> [...]


I am very glad to hear from you that you are doing the vivo demuxer and have
made great work,
so, any related specs for vivo format? I am familar with the muxer mechanism
of FFmpeg but know little about vivo.

According to the link:
http://wiki.multimedia.cx/index.php?title=Small_FFmpeg_Tasks#Implement_a_Vivo_demuxer_for_FFmpeg

Is the file demux_viv.c of MPlayer main reference?

thanks
zhentan
-- 
Best wishes~