Re: Qs re: capture card, composite input, devices

On Mon, May 18, 2015 at 6:56 AM, Howard Eisenberger <howarde@gmx.net> wrote:

On 2015-05-15, Kent West wrote:

> I currently have an RCA-style cable (yellow-tip) going from the VCR's
> composite video output to the "Comp In" (yellow) input on the interface
> that also has the coax connectors. I also have a stereo RCA cable (red &
> yellow tips) going from the VCR's audio outputs to the red & white RCA
> jacks on the same interface card.

I have an old PVR-150. Only ivtv0 in dmesg.

[ 10.511469] ivtv0: Initialized card: Hauppauge WinTV PVR-150
[ 10.511686] ivtv: End initialization
[ 10.582769] ivtv-alsa: module loading...
[ 11.264958] ivtv 0000:02:0b.0: firmware: direct-loading firmware v4l-cx2341x
[ 11.271797] ivtv0: Loaded v4l-cx2341x-enc.fw firmware (376836 bytes)
[ 11.468147] ivtv0: Encoder revision: 0x02060039

This is how I use it.

$ v4l2-ctl -i 2 ; sleep 2 ; ivtv-tune -tus-bcast -c3
Video input set to 2 (Composite 1: ok)
/dev/video0: 61.250 MHz

v4l2-ctl is in package v4l-utils

ivtv-tune is in package ivtv-utils

$ cat /dev/video0 | mplayer -cache 8192 -
to watch.

$ cat /dev/video0 > temp.mpg
to save.

Thanks for the reply, Howard. You've gotten me farther along than I've been.

Now I get a screen with a bottom 2/3rds blue background with a jagged top edge. Ten or so seconds after I turn on my video source, the top third fills with what kind of looks like large-blocky yellow lines of raster painting (lines which angle slightly downward).

Might I ask what the commands you've provided do?

v4l2-ctl -i 2 -- Tell the capture card to use the composite 1 jack as its input?

sleep 2 -- wait 2 seconds for the capture card to settle down after switching inputs, before moving onto the next command.

ivtv-tune -tus-bcast -c3 -- tune the card? to the US Broadcast band? on Channel 3?

Why a separate set of utilities for controlling the card's tuner (ivtv-tune) separate from the set of utilities for controlling the card's input? Why do I have to specify the US-Broadcast band and channel 3; I thought composite input was "composite input" and not a tuned-channel input?

Thanks!

Kent West <")))><
Westing Peacefully - http://kentwest.blogspot.com