Bug#819266: ffmpeg: rtmp is broken

[Jonas Smedegaard]

Quoting Ralf Jung (2016-03-26 09:26:05)
> Hi,
> 
> > Quoting Ralf Jung (2016-03-25 19:19:35)
> >> something about rtmp is broken in ffmpeg as shipped in Debian.
> >> For example, the Revision RTMP streams <https://2016.revision-party.net/live> do not work in either MPV or VLC.
> >> However, after building mpv and ffmpeg using mpv-build <https://github.com/mpv-player/mpv-build>, the streams
> >> *do* work -- and since MPV and VLC shows the same error, I suspect ffmpeg is the culprit here.
> > 
> > Seems to be even lower level than ffmpeg, and already reported: 
> > https://bugs.debian.org/654665
> 
> mpv-build does not seem to build its own version of librtmp. Instead, as
> far as I can tell, it builds ffmpeg without librtmp -- judging from the
> object files I see:
> 
> > ./ffmpeg_build/libavformat/rtmpproto.o
> > ./ffmpeg_build/libavformat/rtmphttp.o
> > ./ffmpeg_build/libavformat/rtmppkt.o
> 
> I don't even have librtmp-dev installed, so it could hardly link against
> that library.
> 
> So I don't think this is fixed because of any changes librtmp could
> make. It rather seems to be fixed by entirely avoiding librtmp.

Interesting.

ffmpeg contains a fork of librtmp which seems to be used if not linking 
against the system shared copy.  Debian favors shared code.

I believe best would be to try figure out what change in the ffmpeg fork 
of librtmp makes it work better (or at all?) compared to the canonical 
project - and port those changes over if possible (and permitted - if 
ffmpeg changes are incompatibly licensed).  That would also benefit 
other projects using librtmp, e.g. libcURL, lightspark and livestreamer.

 - Jonas

-- 
 * Jonas Smedegaard - idealist & Internet-arkitekt
 * Tlf.: +45 40843136  Website: http://dr.jones.dk/

 [x] quote me freely  [ ] ask before reusing  [ ] keep private
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 819 bytes
Desc: signature
URL: <http://lists.alioth.debian.org/pipermail/pkg-multimedia-maintainers/attachments/20160326/c1965eae/attachment.sig>