Date: Mon, 18 Mar 2002 19:27:31 +0100 From: "Steve O'Hara-Smith" <steve@sohara.org> To: Jason Andresen <jandrese@mitre.org> Cc: freebsd-multimedia@freebsd.org Subject: Re: Some video Capture questions (Was: Some audio capture questions) Message-ID: <20020318192731.179b7400.steve@sohara.org> In-Reply-To: <3C960009.FDCF003A@mitre.org> References: <20020315074048.A12682@hostwiththemost> <15506.40571.544247.899130@guru.mired.org> <20020316084125.3b2b0874.steve@sohara.org> <15507.9577.337812.353727@guru.mired.org> <20020316145438.7695fac0.steve@sohara.org> <3C960009.FDCF003A@mitre.org>
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On Mon, 18 Mar 2002 09:56:09 -0500
Jason Andresen <jandrese@mitre.org> wrote:
JA> Steve O'Hara-Smith wrote:
JA> Actually, I'm able to encode at full resolution on an AthlonXP 1700
JA> using
JA> Charles Henrich's (henrich@sigbus.com) mencoder hacks and a BT878 card.
JA> It's certainly feasable with modern hardware to encode good quality
JA> video at full frame rate.
Whoa there - this is interesting!
I am having no end of trouble with those same hacks on my Athlon 1200,
I have exchanged many emails with Charles Henrich and I think we are both
currently baffled. It seems to be thrashing very badly somewhere and produces
awful results (at half resolution). You seem to have it working properly, I
would like to explore the differences. I started from mp0305cv.tgz and
xvid_snapshot_21_01_2002.tar.gz, are these the same ones you have ?
I've also hacked up ffmpeg to grab from bktr which does grab video
nicely (at 384x288) but the sound is several seconds out of sync :( I tried
this code at 768x576 and extrapolated that something around an XP1600 might
just cope - it is nice to hear confirmation.
JA> One strange thing about PC hardware though: I cannot dump raw YUY2 frame
JA> data
JA> to my HD in realtime, I have to encode the data somehow to avoid
That's something like 20 Mbytes per second - few hard discs can
sustain that rate, especially in face of the occasional request to do
something else.
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