From owner-freebsd-multimedia@FreeBSD.ORG  Sat Apr 23 08:56:57 2005
Return-Path: <owner-freebsd-multimedia@FreeBSD.ORG>
Delivered-To: freebsd-multimedia@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 2D4D516A4CE
	for <FreeBSD-multimedia@FreeBSD.org>;
	Sat, 23 Apr 2005 08:56:57 +0000 (GMT)
Received: from web41208.mail.yahoo.com (web41208.mail.yahoo.com
	[66.218.93.41])	by mx1.FreeBSD.org (Postfix) with SMTP id 06E8D43D45
	for <FreeBSD-multimedia@FreeBSD.org>;
	Sat, 23 Apr 2005 08:56:57 +0000 (GMT)
	(envelope-from arne_woerner@yahoo.com)
Received: (qmail 77400 invoked by uid 60001); 23 Apr 2005 08:56:56 -0000
Comment: DomainKeys? See http://antispam.yahoo.com/domainkeys
DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws;
	s=s1024; d=yahoo.com;
	b=umC0+vpDVBnaDnwQWeHq56EAu6l6MTg+8TMlHsoQqjnlpIR7iy2fBYtbztwBoiaFMZudMhFBGIjHrzNODyxTcbRU++Efp7BPHkmQCrFiU8JjGBzWK8MLk9MOk6nyhsQ3/ZybkSzmUJG8+AnSfjiM8Dw33eqvj2nChFXMOvlmpOk=
	;
Message-ID: <20050423085656.77398.qmail@web41208.mail.yahoo.com>
Received: from [83.129.193.53] by web41208.mail.yahoo.com via HTTP;
	Sat, 23 Apr 2005 01:56:56 PDT
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>
In-Reply-To: <20050423063848.67278.qmail@exxodus.fedaykin.here>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
cc: FreeBSD-multimedia@FreeBSD.org
Subject: Re: Help with TV capture (mplayer/brooktree/audigy)
X-BeenThere: freebsd-multimedia@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Multimedia discussions <freebsd-multimedia.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-multimedia>,
	<mailto:freebsd-multimedia-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-multimedia>
List-Post: <mailto:freebsd-multimedia@freebsd.org>
List-Help: <mailto:freebsd-multimedia-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-multimedia>,
	<mailto:freebsd-multimedia-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sat, 23 Apr 2005 08:56:57 -0000

--- 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


__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com