Re: [mythtv-users] analog video camera and Mythtv?

[Roger Hanson]

Nick wrote: On 25/01/06, Roger Hanson <[EMAIL PROTECTED]> wrote: Michael T. Dean wrote: On 01/25/2006 11:06 AM, David Watkins wrote: I suggest looking to see what other /dev/video devices exist on your system, and trying them in place of /dev/video0. I think one of the setup pages of mythtvsetup shows you which input is on which device. I'm afraid I don't know enough of the theory to suggest a more scientific approach. video0 is the MPEG-2 video from whichever input the card is set to use. You don't change inputs by changing video devices, you change with "ivtvctl -p" so see "ivtvctl --help" Mike _______________________________________________ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users Thanks - made progress, but the recording was in black and white, not color like the original.....weird. I did a ivtvctl -p=4 I used dd if=/dev/video0 of=/myth/tv/myfile.mpg bs=64k I got black/white output (was recorded in color) ivtvctl -p=6 I used dd if=/dev/video0 of=/myth/tv/myfile.mpg bs=64k I got black/white output (was recorded in color) Did I do something wrong? Which input did you setup for Myth to use? This is the one you should be trying from the command line. Running 'ivtvctl -a' will give a list of all the inputs/outputs the ivtv driver can access on your card. You need to match the text from mythtvsetup (i.e. S-Video 0) to the input id per ivtvctl. You then need to change to this using 'ivtvctl -p x' where x is the id of the input. [EMAIL PROTECTED]:~$ dd if=/dev/video4 of=/myth/tv/myfile.mpg bs=64k dd: opening `/dev/video4': No such device [EMAIL PROTECTED]:~$ dd if=/dev/video6 of=/myth/tv/myfile.mpg bs=64k dd: opening `/dev/video6': No such device [EMAIL PROTECTED]:~$ su Password: [EMAIL PROTECTED]:/home/mythtv# dd if=/dev/video6 of=/myth/tv/myfile.mpg bs=64k dd: opening `/dev/video6': No such device [EMAIL PROTECTED]:/home/mythtv# dd if=/dev/video4 of=/myth/tv/myfile.mpg bs=64k dd: opening `/dev/video4': No such device [EMAIL PROTECTED]:/home/mythtv# dd if=/dev/video2 of=/myth/tv/myfile.mpg bs=64k dd: opening `/dev/video2': No such device [EMAIL PROTECTED]:/home/mythtv# As Mike stated earlier, you _always_ use /dev/video0 (if you have a single card) when trying to capture MPEG-2 video from the PVR-350 (hence the barrage of error messages). You first need to select one of the available inputs (i.e. tuner, Composite, S-Video) using 'ivtvctl -p x' which, when selected, are "patched" to video0. When using MythTV, all of this input switching is transparent to the user, but on the command line it is needed. For example, to switch to the input "Composite 2" (id 2) you would use # ivtvctl -p 2 To then capture from this input, you would use dd if=/dev/video0 of=/myth/tv/myfile.mpg bs=64k Check which input you specified in mythtvsetup and then try to capture video from /dev/video0 after having switched to this input. You _should_ get the same results as you saw in MythTV. Black and white video when you were expecting colour is almost always (on the PVR cards) due to either selecting the wrong type of input (S-Video instead of Composite) or using a cable that does not support S-Video. Finally, ensure that the ivtv driver is autodetecting you tuner type and correctly setting the video format (you can manually set this using ivtvctl too). Nick _______________________________________________ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users Thanks - that's exactly what I was doing wrong,  I  was selecting the source number and then expecting to switch to something other than video0 as well - sort of double switching?  That makes sense now that I will always record off /dev/video0 instead of other sources (unless I get another tuner card...) Anyway, I'm recording in color now. Thanks.

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