VHS tearing even WITH TBC and JVC SVHS player.
Hey guys!
So its been a while since i was last here, mainly due to the fact that thanks to this site, my transferring of tapes has gone effortlessly! However, a VHS tearing issues has arised in a few tapes that i need help with! This is my setup. SVHS player (JVC SR-V10U) + Grex TBC (http://www.xdimax.com/grex/grex.html) + DVD recorder (pioneer, really good quality one) + S-VIDEO cables. I can transfer tapes pretty well with this setup. I click the button on the front of the SVHS player which enables TBC/DNR, set the mode to AUTO in settings for picture, video stabiliser to off, D3 to off etc. Most of the time this works perfectly, no issues. But on a few copyright protected tapes there is tearing. It happens like this. I start transferring....its fine, but the length in which there are no issues with tearing can vary. Sometimes its 10 minutes until the tearing occurs, sometimes its 5 minutes. Ive noticed that if i have turned all the equipment off. and leave it off for quite a few hours (at least 14 hours to a day), then the time it takes before tearing occurs is longer (it kind of resets or fixes itself...), and when it starts flickering, i must then pause the recording, turn off the SVHS player and grex, wait a few hours and try again. I dont know why i have to do this, maybe it gets overheated? or overloaded? im not sure, its frustrating though! If i turn it off for only a couple of hours, the flickering almost starts instantly again... If i leave everything off for 12 hours, the flickering comes back after like 5 minutes.... then i have to restart the cycle again. Can anyone explain why this happens? or how i may be able to fix it. I only have this one 20 minute tape left to transfer..but i cant just pause and record from the tape because the timing will be all wrong, and its music videos! Thankyou for any help :) |
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Why does this happen? Well, it all goes back to VHS/analog recording theory, and the importance of time-base and sync.
Short answer: The timing is uneven. The signal is be requested or provided at uneven intervals, and the byproduct is the signal is stretched linearly along the upper portion of the signal. Visibly, it's appears to be tearing, or bending (or ripping or flagging, depending on the layman word of choice). Looooooooooong answer: Read the following two-page excerpt from the book VCR Troubleshooting & Repair by Greg Capelo and Robert Brenner... Quote:
I highly suggest buying this book, if you have any interest in better understanding how VCRs and analog signals work. It will take a lot of mystery out of video, even if it's not necessarily the easiest of reads. Note that it's been out of print for years now, so don't expect to take a stroll to the nearest Barnes & Noble and find it on the shelf. |
Now then, how to fix it? This is easy for me to answer, too!
Short answer: Use a Panasonic ES10 DVD recorder as a pass-through device. Longer answer: Read the sticky topic (FAQ Answer) concerning timebase correction. What is a TBC? Time Base Correction for Videotapes. Quote:
The only other device commonly known to correct this is the JVC D-VHS VCR. Certain older broadcast TBCs can do it too, but it varies widely between brands, models and sub-models of TBC. The DVD recorder is easiest, and often cheapest, and therefore most suggested. Good luck on the project. :) |
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