Date: Tue, 14 Jun 2005 9:59:34 -0400 From: <dmwassman@cox.net> To: Steve O'Hara-Smith <steve@sohara.org>,<freebsd-multimedia@freebsd.org> Subject: Re: Capturing video with Intel Smart Video Recorder III Message-ID: <20050614135934.GHXT28809.lakermmtao07.cox.net@smtp.east.cox.net>
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Steve, Thanks for the help. I haven't had too much experience with video capture and the handbook is a little thin on this. Steve O'Hara-Smith wrote: >On Mon, 13 Jun 2005 23:44:38 -0400 >David Wassman <dmwassman@cox.net> wrote: > >>Please help. I am having some difficulty in capturing video with this >>card. > > > I notice that the card is reported as having no tuner - is this >in fact the case and what are you using as a video source ? > I have the card hooked up to a VCR thru a composite cable. I didn't do the research when I bought the card on Ebay and was under the impression it came with a tuner until I received it. Is this going to be a problem (other than I have to set the VCR to anything I want to capture)? >>I have compiled a new kernel with the bktr driver. I have tried >>NuppelVideo: >> >>nuvrec -n -V /dev/bktr0 -A /dev/dsp0.0 test >> >>I get sound but just a blue screen. No video. > > > Most brooktree based cards have several inputs (usually known as >devices for no obvious reason) for example mine has TV, S-Video and RCA >inputs. The blue screen is a classic symptom of having the wrong input >selected. I thought so myself as it looks like a VCR blue screen when the wrong input is selected yet I cannot figure out how to change the input. > > Both nupplevideo and ffmpeg have the same capture code and respond >to the BKTR_DEV environment variable to select the input device (for me >1 selects TV, 2 S-Video and 3 RCA). Nuppelvideo and older (0.48 or earlier) >versions of ffmpeg also respond to BKTR_FORMAT (pal, ntsc, secam and a few >variants), recent versions of ffmpeg have the -tvstd parameter and set a >default of ntsc which overrides the BKTR_FORMAT environment variable. >Finally if you have a tuner setting BKTR_FREQ to a number in MHz can be used >to tune it. So it is an environment variable and not the two devices setup thru bktr (ie bktr and bktr0)? I will try this when I get home. I will let you know how it works out. Is this set in /etc/profile or is there another config I need to set this variable in to use it after system start up? > >>I have also tried ffmpeg: >> >>ffmpeg -vd /dev/bktr0 -ad /dev/dsp0.0 test.mpg >> >>I get an unusable file. > > > Now for the ffmpeg warning - ffmpeg-049pre1 has dreadful A/V sync >problems when capturing, ffmpeg-devel is much better but still slips. The >golden version of ffmpeg for capture is 0.48 which won't slip sync no matter >what you do (i've tried with a make buildworld running at the same time, it >drops lots of frams and looks awful but the sync is good). > > If you like I can send you a port skeleton and distfile for >ffmpeg-0.48. > I rather get NuppelVideo working as it uses less CPU. I am using a old computer (PII 400 w 256MB) to do this capture and am concerned with the capture rate and quality. Again, I am completely new to this video stuff, so if you think ffmpeg is better, I will give it a try. David Wassman
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