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From: Andy Furniss on 25 Apr 2010 16:18 Davey wrote: >> mplayer -vo xv:adaptor=1 tv:// -tv >> driver=v4l2:norm=NTSC:buffersize=64:device=/dev/video0:audiorate=48000:immediatemode=0:forceaudio:adevice=/dev/dsp1 >> > Couldn't get that to work, it didn't like anything after the "xv", and I > couldn't find any other way of switching the video mode to textured. Oh well, I guess it doesn't matter anyway - if your main use will be to record with mencoder. You could also have used -vo xv:port= and used the first port number xvinfo shows for textured vid. > > I tried some other stuff, but it either made no difference, or caused > crashes! If you have any other ideas, they would be welcome > Currently using: > mplayer -vo xv tv:// -tv > driver=v4l2:norm=NTSC:device=/dev/video0:audiorate=48000:immediatemode=0:forceaudio:adevice=/dev/dsp1:volume=2000 If it keeps running with this, then maybe trying to capture with mwncoder would be the best thing to try next. I tested one pass encoding with a short raw vid file and it's a lot better than the windows quality wise - but maybe a bit borderline for Cpu. mjpeg gives really nice results with low CPU usage but makes for big files - but that's OK as an intermediate format to code to mpeg2 after the capture. If you are going to make mpeg2, then you can save a bit of USB bandwidth by using a different raw format that uses the same type (4:2:0) as mpeg will. Also if DVD is your target then you need to get the dazzle to output 720x480. I would try as a test - mencoder -vf harddup -of lavf -oac pcm -ovc lavc -lavcopts vcodec=mjpeg -ofps 30000/1001 -o outfilename.avi tv:// -tv driver=v4l2:norm=NTSC:device=/dev/video0:width=720:height=480:outfmt=yv12:audiorate=48000:immediatemode=0:forceaudio:adevice=/dev/dsp1:volume=2000 Are you planning to make "real" DVDs to play on a standalone player - or just wanting to make files to burn to a dvd and play on a computer?
From: Davey on 25 Apr 2010 16:32 On Sun, 25 Apr 2010 21:18:27 +0100, Andy Furniss wrote: > Davey wrote: > >>> mplayer -vo xv:adaptor=1 tv:// -tv >>> driver=v4l2:norm=NTSC:buffersize=64:device=/dev/video0:audiorate=48000:immediatemode=0:forceaudio:adevice=/dev/dsp1 >>> >> Couldn't get that to work, it didn't like anything after the "xv", and I >> couldn't find any other way of switching the video mode to textured. > > Oh well, I guess it doesn't matter anyway - if your main use will be to > record with mencoder. You could also have used > -vo xv:port= > and used the first port number xvinfo shows for textured vid. > >> Ok, I might give thata try next time. >> I tried some other stuff, but it either made no difference, or caused >> crashes! If you have any other ideas, they would be welcome >> Currently using: >> mplayer -vo xv tv:// -tv >> driver=v4l2:norm=NTSC:device=/dev/video0:audiorate=48000:immediatemode=0:forceaudio:adevice=/dev/dsp1:volume=2000 > > If it keeps running with this, then maybe trying to capture with > mwncoder would be the best thing to try next. > mencoder ? > I tested one pass encoding with a short raw vid file and it's a lot > better than the windows quality wise - but maybe a bit borderline for Cpu. > > mjpeg gives really nice results with low CPU usage but makes for big > files - but that's OK as an intermediate format to code to mpeg2 after > the capture. > > If you are going to make mpeg2, then you can save a bit of USB bandwidth > by using a different raw format that uses the same type (4:2:0) as mpeg > will. Also if DVD is your target then you need to get the dazzle to > output 720x480. I would try as a test - > > mencoder -vf harddup -of lavf -oac pcm -ovc lavc -lavcopts vcodec=mjpeg > -ofps 30000/1001 -o outfilename.avi tv:// -tv > driver=v4l2:norm=NTSC:device=/dev/video0:width=720:height=480:outfmt=yv12:audiorate=48000:immediatemode=0:forceaudio:adevice=/dev/dsp1:volume=2000 > Wow, that's amouthful. I'll decode it, so I can understand what I'm doing. > Are you planning to make "real" DVDs to play on a standalone player - or > just wanting to make files to burn to a dvd and play on a computer? Either or both. One that plays on a DVD player would be good, but not essential. I have a multi-format (PAL/NTSC) multi-voltage (120-240) multi-frequency (50/60) all-region DVD player, so that might not be a problem. Thanks for the help, you are way, way beyond me in this, so your help is much appreciated. -- Davey.
From: Davey on 26 Apr 2010 11:07 On Sun, 25 Apr 2010 21:18:27 +0100, Andy Furniss wrote: > Davey wrote: > >>> mplayer -vo xv:adaptor=1 tv:// -tv >>> driver=v4l2:norm=NTSC:buffersize=64:device=/dev/video0:audiorate=48000:immediatemode=0:forceaudio:adevice=/dev/dsp1 >>> >> Couldn't get that to work, it didn't like anything after the "xv", and I >> couldn't find any other way of switching the video mode to textured. > > Oh well, I guess it doesn't matter anyway - if your main use will be to > record with mencoder. You could also have used > -vo xv:port= > and used the first port number xvinfo shows for textured vid. > >> >> I tried some other stuff, but it either made no difference, or caused >> crashes! If you have any other ideas, they would be welcome >> Currently using: >> mplayer -vo xv tv:// -tv >> driver=v4l2:norm=NTSC:device=/dev/video0:audiorate=48000:immediatemode=0:forceaudio:adevice=/dev/dsp1:volume=2000 > > If it keeps running with this, then maybe trying to capture with > mwncoder would be the best thing to try next. > > I tested one pass encoding with a short raw vid file and it's a lot > better than the windows quality wise - but maybe a bit borderline for Cpu. > > mjpeg gives really nice results with low CPU usage but makes for big > files - but that's OK as an intermediate format to code to mpeg2 after > the capture. > > If you are going to make mpeg2, then you can save a bit of USB bandwidth > by using a different raw format that uses the same type (4:2:0) as mpeg > will. Also if DVD is your target then you need to get the dazzle to > output 720x480. I would try as a test - > > mencoder -vf harddup -of lavf -oac pcm -ovc lavc -lavcopts vcodec=mjpeg > -ofps 30000/1001 -o outfilename.avi tv:// -tv > driver=v4l2:norm=NTSC:device=/dev/video0:width=720:height=480:outfmt=yv12:audiorate=48000:immediatemode=0:forceaudio:adevice=/dev/dsp1:volume=2000 > > Are you planning to make "real" DVDs to play on a standalone player - or > just wanting to make files to burn to a dvd and play on a computer? One other puzzle: If I use the command described earlier, and then shut mplayer down deliberately, I can then run it again. But if it shuts down on a failure, such as video buffer full, and I then try to run it again, I get the failure message "/dev/video0: file or directory does not exist". The only way I have found of getting it to work again is to reboot. But if I look for /dev/video0, there is still nothing there, but the command will now work. Any ideas? -- Davey.
From: Andy Furniss on 26 Apr 2010 14:53 Davey wrote: > One other puzzle: > If I use the command described earlier, and then shut mplayer down > deliberately, I can then run it again. But if it shuts down on a failure, > such as video buffer full, and I then try to run it again, I get the > failure message "/dev/video0: file or directory does not exist". > The only way I have found of getting it to work again is to reboot. But if > I look for /dev/video0, there is still nothing there, but the command will > now work. > Any ideas? Not really - but you could after it's crashed do ps ax and see if mplayer is still running if it is kill -9 <it's process number> You could also see if unplugging and replugging the dazzle makes /dev/video0 re-appear.
From: Davey on 26 Apr 2010 16:00
On Mon, 26 Apr 2010 19:53:02 +0100, Andy Furniss wrote: > Davey wrote: > >> One other puzzle: >> If I use the command described earlier, and then shut mplayer down >> deliberately, I can then run it again. But if it shuts down on a failure, >> such as video buffer full, and I then try to run it again, I get the >> failure message "/dev/video0: file or directory does not exist". >> The only way I have found of getting it to work again is to reboot. But if >> I look for /dev/video0, there is still nothing there, but the command will >> now work. >> Any ideas? > > Not really - but you could after it's crashed do > ps ax and see if mplayer is still running if it is > kill -9 <it's process number> > > You could also see if unplugging and replugging the dazzle makes > /dev/video0 re-appear. The crashes with the full buffer were always accompanied by an ever-repeating 'Error' message, so mplayer was still running, it just couldn't work any more. I would stop it with a Cntrl-C, and would then get the normal prompt. Repeating the same command line would then fail with the afore-mentioned message. The unplug/replug idea is worth a try, for sure. FWIW, knowing that I am not connected to the Dazzle, I tried your suggested command anyway, to see what it would do: "david(a)david-laptop:~$ mencoder -vf harddup -of lavf -oac pcm -ovc lavc -lavcopts vcodec=mjpeg -ofps 30000/1001 -o outfilename.avi tv:// -tv driver=v4l2:norm=NTSC:device=/dev/video0:width=720:height=480:outfmt=yv12:audiorate=48000:immediatemode=0:forceaudio:adevice=/dev/dsp1:volume=2000 MEncoder 2:1.0~rc2-0ubuntu19 (C) 2000-2007 MPlayer Team CPU: Mobile Intel(R) Pentium(R) 4 CPU 3.06GHz (Family: 15, Model: 2, Stepping: 9) CPUflags: Type: 15 MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1 Compiled with runtime CPU detection. success: format: 9 data: 0x0 - 0x0 TV file format detected. Selected driver: v4l2 name: Video 4 Linux 2 input author: Martin Olschewski <olschewski(a)zpr.uni-koeln.de> comment: first try, more to come ;-) v4l2: unable to open '/dev/video0': No such file or directory v4l2: ioctl set mute failed: Bad file descriptor v4l2: 0 frames successfully processed, 0 frames dropped. ============ Sorry, this file format is not recognized/supported ============= === If this file is an AVI, ASF or MPEG stream, please contact the author! === Cannot open demuxer. Exiting..." When I do it for real, I will select a better out file name, naturaally. But what file format does it not recognise? mjpeg? Avi? It doesn't specify! Thanks again. -- Davey. |