Cory Papenfuss wrote:
I have tried unsuccessfully from many sources to find a solution for
my problem while recording from VHS. I hope this list can help.
You will likely have some problems. VHS consumer machines put out
pretty bad quality "NTSC" signals. Some are better than others, and you
may be able to get away with it sometimes but not others.
The bottom of the picture I am receiving from the VCR has a wavy,
pulsating line. I have tried both mythtv and ptune record with the
same result.
I'm not sure what you mean by "wavy pulsating line". If you're
talking about the bottom of the picture having snow, etc, that's also
typical from VHS bad tapes, bad alignment, etc.
I quess calling them scan lines with no picture might be more accurate.
In place of the picture I get a few rows of color blobs moving across
the screen. Very annoying. I am trying to copy old VHS tapes that were
taken about 8 years ago using my VHS camcorder. I want to put them on
DVD. However that mess across the bottom would be very distracting for a
long period of viewing.
ptune? You connecting via the RF-input? You really want to connect
via composite (or s-vid if your VCR is neato enough to have it).
I only have a RF output from my VCR. I use channel 4 to copy them thru
my pvr-250.
Someone said that it was because of the 480 scanlines coming from the
VCR. He suggested using the crop filter in mythtv. However this does
not work with my pvr 250 card.
I did an ivtvctl -a and noticed that in VIDIOC_G_FMT the Video Capture
height is 480. I am not sure if this is a measure of scan lines or
something else. Under VIDIOC_ENUMSTD for NTSC the frame lines are 525.
Can this number be changed to correspond with the scan lines from the
VHS? Is there a connection?
The number of scanlines from VHS is the same as the number of
scanlines from ANY NTSC source: 525/frames (262.5/field)... Only
480-ish of those are visible. The rest are "off the screen"... above
the top and below the bottom. You want to capture 480 lines, not 525.
What would happen if I changed the capture to say 460 lines. Would this
cut off the bottom?
If you've got persistant fuzz at the bottom, the "crop filter"
suggested would be a post-processing thing once you've recorded it.
Without a more accurate description of the problem, it's hard to figure
out what's causing it.
This appears to be a common problem with VHS. There are others having
the same problem. However no one has suggested a cure. How would I
eliminate this in post processing?
Thanks,
Gary
P.S.
I am in NC at the VA Beach border.
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