[mythtv-users] analog video camera and Mythtv?

[Roger Hanson]

Nick wrote:

>On 25/01/06, Roger Hanson <roger at rogerhanson.com> 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
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>>mythtv-users mailing list
>>mythtv-users at 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.
>
>  
>
>> mythtv at pvr:~$ dd if=/dev/video4 of=/myth/tv/myfile.mpg bs=64k
>> dd: opening `/dev/video4': No such device
>> mythtv at pvr:~$ dd if=/dev/video6 of=/myth/tv/myfile.mpg bs=64k
>> dd: opening `/dev/video6': No such device
>> mythtv at pvr:~$ su
>> Password:
>> root at pvr:/home/mythtv# dd if=/dev/video6 of=/myth/tv/myfile.mpg bs=64k
>> dd: opening `/dev/video6': No such device
>> root at pvr:/home/mythtv# dd if=/dev/video4 of=/myth/tv/myfile.mpg bs=64k
>> dd: opening `/dev/video4': No such device
>> root at pvr:/home/mythtv# dd if=/dev/video2 of=/myth/tv/myfile.mpg bs=64k
>> dd: opening `/dev/video2': No such device
>> root at pvr:/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 at 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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