Date: Sat, 23 Apr 2005 01:56:56 -0700 (PDT) From: Arne "Wörner" <arne_woerner@yahoo.com> To: Steve O'Hara-Smith <steve@sohara.org> Cc: FreeBSD-multimedia@FreeBSD.org Subject: Re: Help with TV capture (mplayer/brooktree/audigy) Message-ID: <20050423085656.77398.qmail@web41208.mail.yahoo.com> In-Reply-To: <20050423063848.67278.qmail@exxodus.fedaykin.here>
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--- Mario Sergio Fujikawa Ferreira <lioux@FreeBSD.org> wrote:
> > > > > 2) Every few seconds the video
> > > > > stream seems to choke; thus,
> > > > > giving me an effect similar
> > > > > to the famous interlaced
> > > > > "blinders effect" so I added a
> > > > > deinterlacer filter
> > > >
> > > > Sync detection problems perhaps.
>
> Is there anything I can do to improve that? Perhaps,
> a harder filter looking for those? I fear that such harder
> filtering will just decrease performance; thus, increasing
> the choking effect.
>
> Bear in mind that I do not mind 100% CPU occupancy for as
> long as, I can get good quality TV capture with good audio. :)
>
I mentioned, that the bktr does not issue a signal for every
expected frame. So I use my own code, that becomes impatient, when
the next frame is due, so that it just takes it (I use this old
mmap access method). I think, that way I get at least the right
frame rate and possibly even the right frame (maybe the signal
gets lost or so...).
And I run the application with real time priority, because I hope,
that it cannot miss frames as easy as with normal or neg. nice
value.
If you want, I can give you my source code. Here is a little piece
of it (I want 25 fps; those 25 fps are hard coded *blush*):
tel = now();
int dt = tel - tnx;
bool grabNext = dt>=15000;
if (grabNext) {
if (dt >= 70000)
misFC++;
else
grabNext = framerFlag;
// framerFlag corresponds to signal
}
if (!grabNext) {
usleep(1);
continue;
}
-Arne
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