Re: A problem with H.264 video (DVB-T)

Le Sunday 02 November 2008 20:59:24 Pavel Troller, vous avez écrit :
> > > Hi!
> > >   I've found that I can play HD streams forever with no skipping - it's
> > > just enough to activate the time shift feature for a second or two, and
> > > it plays the stream, buffered by the time shift file, perfectly. It's
> > > the definitive evidence that this problem is not caused by lack of CPU
> > > power - in this mode, the system is loaded more than when just playing
> > > from the DVB device, because it has to write the time shift file and
> > > play it back simultaneously. The only thing I have to remember, is to
> > > erase the time shift file manually (I didn't find an option in kaffeine
> > > to erase it automatically).
> > >   I've tried to change number of video buffers and frames in the xine
> > > engine settings, and it doesn't influence anything, the problem appears
> > > in approximately the same time for 500 buffers as well as for 4000.
> > > WIth regards, Pavel Troller
> >
> > Hm, interesting.
> > So it could be a ringbuffer issue.
> >
> > Could you please try the following:
> >
> > - Apply the joined patch to current kaffeine svn and make install
> > - Start kaffeine from a term, play live HD and look at the output for
> > "WDIST = XXX" msg.
> > - If you see this message (could repeat a lot), edit dvbout.cpp and
> > change the value of WDISTSIZE in: #define WDISTSIZE 100
> > Increase the value until you stop seeing the msg.
> >
> > Lemme know if it fixes your problem.
> >
> > P.S.
> > the ringbuffer size is: 188*64*WDISTSIZE bytes
>
> Hi Christopher!
>
>   Many thanks for your help! I tested your patch. I'm afraid that the
> problem is somewhere else, it didn't help.
>   I even decreased WBUFSIZE to 50 and it behaved again as usual. I've
> modified your patch to print WDIST everytime it goes around (commented out
> your "else") and it showed that the values are very small: most of the time
> 1, sometimes 2 - 5, maximum I've ever seen was 19. There is no visible
> change in the pattern, when the video starts to skip.
>   However, during my experiments, I'v noticed the following warning to be
> printed, exactly once per one "video session":
>
> kaffeine: KXineWidget: xine event: dropped frames
> kaffeine: WARNING: KXineWidget: Skipped frames: 67 - discarded frames: 33
>
>   It was interesting that the message appeared shortly after the video
> became to skip, but never appeared again during the same session. The
> numbers were different every time, but their sum was always 100. When the
> timeshift mode was activated immediately after startup, preventing the
> skips to appear, this message didn't appear (and playback was smooth for at
> least 10 minutes).
>
>   With regards, Pavel Troller

Hm, strange.

A last try:

edit kaffeine/src/player-parts/xine-part/kxinewidget.cpp
in function KXineWidget::setDvb replace
m_trackURL = pipeName;
with
m_trackURL = "fifo://"+pipeName;

Zapping will be slower however.

-- 
Christophe Thommeret


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