Date: Fri, 10 Jan 2003 19:00:40 +0100 From: Steve O'Hara-Smith <steve@sohara.org> To: Andre Albsmeier <andre.albsmeier@siemens.com> Cc: andre.albsmeier@siemens.com, freebsd-multimedia@FreeBSD.ORG Subject: Re: AV sync on ffmpeg captures - was Re: FreeBSD 4.7R: no sound when recording with ffmpeg? Message-ID: <20030110190040.00bc5dda.steve@sohara.org> In-Reply-To: <20030110082231.A32663@curry.mchp.siemens.de> References: <20021028202230.1283e8cd.steve@sohara.org> <Pine.BSF.4.21.0210292118440.11617-100000@brain.stagecraft.cx> <20021029194220.7fb532ad.steve@sohara.org> <20030106115851.A12349@curry.mchp.siemens.de> <20030106215821.60130d42.steve@sohara.org> <20030107085526.A14263@curry.mchp.siemens.de> <20030107191359.12abeb78.steve@sohara.org> <20030109144913.A30175@curry.mchp.siemens.de> <20030109192247.0602e203.steve@sohara.org> <20030110082231.A32663@curry.mchp.siemens.de>
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On Fri, 10 Jan 2003 08:22:31 +0100
Andre Albsmeier <andre.albsmeier@siemens.com> wrote:
AA> On Thu, 09-Jan-2003 at 19:22:47 +0100, Steve O'Hara-Smith wrote:
AA> > On Thu, 9 Jan 2003 14:49:13 +0100
AA> > Andre Albsmeier <andre.albsmeier@siemens.com> wrote:
AA> > Yep - I've played a lot of VOBs and AVIs in mplayer without sync
AA> > problems too. Timestamping in streams is an amazingly complex thing
AA> > (ie.
AA>
AA> Well, let me ask you one question: What happens if you play a ffmpeg
AA> generated stream with mplayer? Is the problem reproducible?
I haven't seen slippage since the last iteration of the grab code,
before that I did. I don't think you are the only one seeing it now
though.
AA> This doesn't help a lot. The interesting thing is, when playing
AA> without the -fps option, mplayer tells me that the frame rate is
AA> 25.00:
Good the header is at least partially valid :)
AA> However, I have got the impression that the whole -fps stuff doesn't
AA> work a good as it should be. E.g., if you use -fps and let a file
AA> play normally until a certain position, the AV-offset is different as
AA> it is if you seek 20 seconds before the same point and let it play
AA> from there.
Ugh!
AA> Unfortunately, I can't help here. But in case you want me to do some
AA> tests I am happy to help...
Thanks, I'll let you know if/when I get anywhere with it.
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