[Mplayer-dvb] Slow performance on still scenes ?

[Tilo Renkl]

Hi Martin,

got the same problem here, even with a 2,2 GHZ P4 CPU !!!!
But right now I only know one of my film producing this
effect. In my case it happens in a scene, where many black
lines are drawn on a white paper and the whole picture 
moves because of camera motion. 

Tilo

> Mhhh
> using lavc=2 or btter lavc=3 seems to "cure" the problem !
> 
> However using these "lower" quality setting reduces the 
> picture quality 
> slightly - is there a method mplayer could dynamically vary 
> between lavc=1..3 
> depending on the complexity of the source video ?
> 
> Martin
> 
> Am Dienstag, 21. Mai 2002 23:45 schrieben Sie:
> > Any news on this ?
> >
> > Any new ideas, how to solve ?
> >
> > It's quite annoying when the stutter effect appears :-(((
> >
> > Latest cvs seems to have same "problem" (if i'm allowed to 
> call it this :-)
> > ...
> >
> > Martin
> >
> > Am Montag, 6. Mai 2002 21:19 schrieben Sie:
> > > Mhhh,
> > >
> > > i have played around with various values - but i'm afraid 
> anything i
> > > tried made it even worse :-(
> > >
> > > Increasing the value (+0.2 and above) lead to lower 
> framerate !? Somehow
> > > the visible output fps dropped below 25 fps ... using +1 
> even lead to 1
> > > fps slideshow ...
> > > Too Low values (beginning at around -0.05) lead to 
> "hang-ups" while
> > > playing - only seeking could cure the freeze (sound and 
> video freezed) !
> > >
> > > However i had the feeling that -0.02 was a little better 
> that +-0 - but
> > > not good enough the stuttering was quite audible !
> > >
> > > However i cut the scene out of the movie - where it's 
> quite visible and
> > > audible and i am currently uploading the clip to 
> mplayerhq's ftp - the
> > > file is named stutter.avi and is around 6MB of size !
> > > The problem occurs at around 7 seconds where the audience 
> of a football
> > > game is shown and a little bit at 15 secs where a helmet 
> of a football
> > > player is shown !
> > > When watching this clip, don't get confused with the 
> obvious slow motion
> > > scenes at the beginning, where the back of guy named 
> phoenix is shown...
> > >
> > > btw: Playing this clip with video out on Xserver and 
> audio out via oss
> > > the clip plays just fine ... however i cannot test with 
> -vo mpegpes and
> > > audio via oss - since my dvbs box hasn't a soundcard :-/
> > >
> > > I hope this can help to solve this problem - it's quite 
> annoying, since
> > > everything else is quite perfect :-)
> > >
> > > Martin.
> > >
> > > Am Sonntag, 5. Mai 2002 17:30 schrieben Sie:
> > > > Hi,
> > > >
> > > > > But with -vop lavc the picture quality is much better !
> > > > >
> > > > > Any idea ?
> > > > > I have tried several AVIs and it's all the same - 
> only scenes with no
> > > > > or ver y
> > > > > low motion and high contrast (black white or Snow and 
> sky and stuff)
> > > > > - also it seems to happen with high detailed scenes ...
> > > >
> > > > high detail scenes needs much more bits - so such 
> frames are big.
> > > > probbaly they don't fit into DVB card's small buffer 
> (256k?) so you get
> > > > buffer underrun -> sound breaks.
> > > >
> > > > find this in ao_mpegpes.c:
> > > >
> > > > static int get_space(){
> > > >     float x=(float)(vo_pts-ao_data.pts)/90000.0;
> > > >     int y;
> > > >
> > > > and try to add -1..+1 offset to x, for example, try:
> > > >
> > > >     float x=(float)(vo_pts-ao_data.pts)/90000.0 + 0.2;
> > > >
> > > > it needs some experiencing with various values - tell 
> me if you find a
> > > > good one.
> > > >
> > > >
> > > > A'rpi / Astral & ESP-team
> > >
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