Andy Walls wrote:
> How many pixels wide is the vertical band? There should be 720 pixels
> total across the whole line.
After more experimentation, I find that the wide, vertical black band on the
left side is a feature of the original VHS tape, which was recorded from a
PBS master 1/2" reel tape. I'm not sure why it doesn't show when the VHS is
displayed on a televion, but perhaps there're more than 720 pixels width?
How would I determine the pixel resolution of the captured mpeg2 image, and
the width of the black band?
> How many lines at the bottom of thre screen are affected? An NTSC
> screen will be 480 lines tall when digitized.
How would I determine how many lines at the bottm are affected, please? The
distortion can be removed by cropping 9 pixels withVLC.
It's curious that when I "snap" a still image using either Xine or VLC, the
resolution is 720x540
>> What might be causing these features? Have I got a bad card?
>
> Not likely.
>
> Most likely your VCR is putting out crappy horizontal sync and/or
> vertical sync. Tweaking various registers in the CX2584x chip may
> have positive results for you- but it's not easy for the general user.
...
I'm not clear on the usage of:
--set-crop-video=top=<x>,left=<y>,width=<w>,height=<h>
set the video capture crop window [VIDIOC_S_CROP]
Would the following crop 11 pixels off the left, and 9 pixels off the
bottom?
--set-crop-video=top=0,left=11,width=709,height=471
and how would I undo that if it's incorrect? "--get-crop-video" returns a
null string. so I assume "--set-crop-video=" would reset it to its current
state?
I'm getting errors when attempting it:
$ v4l2-ctl -d
/dev/video0 --set-crop-video=top=0,left=11,width=709,height=471
ioctl: VIDIOC_S_CROP
ioctl: VIDIOC_G_CROP failed
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