It would seem that there has been a regression in UDP playback.
 From version r15633 to r15634 there have been changes made to 
libavformat/aviobuf.c
The changes have been made in 'static void fill_buffer(ByteIOContext *s)'
This was in the logs:

    Append read data onto the buffer instead of overwriting, this ensures
    that the whole buffer is available for seeking back.
    Fixes issue480

Instead of playing the stream, the output is garbage as if there was a 
lot of packet loss.
The behavior is the same on windows xp and linux (ubuntu 8.10)

The problem was detected by streaming a mpeg2 file with VLC (0.9.2) and 
playing the file using ffplay.
It would seem that the problem is limited to multicast.

We also tried using the latest revision with aviobuf.c from r15633, 
which worked fine.

If you need more information, just ask!

thanks in advance,
- Arjan
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