Quantcast Do I Need a Time Base Corrector? (PVR-350 Problem) - digitalFAQ.com Forums [Archives]
  #1  
04-29-2007, 03:02 PM
rab rab is offline
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I've been trying to capture some home movie VHS tapes with the PVR 350 and the result shows the occasional dropped frame which is really noticable. I think it's dropped frames. The sound is continuous while the picture jumps/jerks occasionally. The glitch doesn't seem to effect the a/v sync.

I've been doing a bit of reading and i've learnt that when old VHS tapes get so worn, the sync signal gets messed up causing these problems. One way to solve it, apparently, is to copy the worn tape to a new one and capture from that. The other way is to use a time base corrector.

Could worn tapes be the cause of my problems and would a time base corrector really fix it for sure?

I'm using Sage Recorder to capture.
3.06GHz HT Processer
C-Media AC97 onboard Soundcard
1Gb Ram
Nvidia Geforce FX 5200
160Gb HDD Partitioned

Thanks in advance for any help!
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Someday, 12:01 PM
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  #2  
04-30-2007, 02:23 AM
kwag kwag is offline
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Quote:
Originally Posted by rab
One way to solve it, apparently, is to copy the worn tape to a new one and capture from that.
NEVER do that
You'll loose a generation of quality in the copy, and the result will be worse!
Quote:
The other way is to use a time base corrector.
Way to go

-kwag
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  #3  
04-30-2007, 10:54 AM
rab rab is offline
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Quote:
Originally Posted by kwag
You'll loose a generation of quality in the copy, and the result will be worse!
Yeah, that's what i thought.
Quote:
Way to go
I guessed that would be the answer. That's a shame, they are so expensive. Have you ever used one? Are they easy to use?
I found two on ebay. Do you know if they are any good?
http://cgi.ebay.co.uk/Digital-Time-b...QQcmdZViewItem

http://cgi.ebay.co.uk/Electrocraft-T...QQcmdZViewItem

Cheers!
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  #4  
04-30-2007, 06:37 PM
kwag kwag is offline
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Quote:
Originally Posted by rab
Do you know if they are any good?
Sorry, no. I've never seen these before.

-kwag
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  #5  
05-01-2007, 05:05 PM
GFR GFR is offline
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I think there are some JVC SVHS VCRs that have a buit-in TBC. Problably not as good as a standalone TBC, but it's practical and not so expensive.
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  #6  
05-01-2007, 05:24 PM
Dialhot Dialhot is offline
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TBC works only in SVHS mode, not in VHS. So the source must be recorded in SVHS.
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  #7  
05-10-2007, 10:14 PM
Boulder Boulder is offline
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Nope, TBC does work for both VHS and SVHS. I've got a friend who has one of those JVC units GFR mentioned. In fact, they are better than standalone TBCs because the signal comes directly from the tape!
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  #8  
05-11-2007, 02:34 AM
Dialhot Dialhot is offline
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I had a JVC SVHS camcorder and the TBC works only on S-VHS recording (either on VHS or S-VHS tape, as this unit allowed to use VHS tapes even for SVHS recording). So I guess it depends on them.

Nevertheless, one thing is sure : the timecode is put at the recording time, and only by units that manage it. Chances are poor than rab's ones have it.
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  #9  
05-11-2007, 03:16 AM
Boulder Boulder is offline
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http://en.wikipedia.org/wiki/Time_Base_Corrector

You don't need a timecode, any tape can be used
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  #10  
05-11-2007, 07:15 AM
Dialhot Dialhot is offline
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Lol. You are talking about 2 kinds of TBC :
1/ standalone TBC, that are based on what wikipedia describes :
Quote:
A time base corrector is simply a big bucket that video can be stored in and then let out at a precise rate. In modern time base correctors the video is digitized and stored in a buffer. A clock chip then releses the video at a steady rate.
2/ TBC that you find on SVHS unit use a timecode registered on the video, called the LTC, but that can be also registered by any regular VHS unit, as long as it has stereo audio.
http://en.wikipedia.org/wiki/Linear_timecode

As you said,#1 are less efficient than #2 (but can be used with any tapes).
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  #11  
05-11-2007, 09:15 AM
Boulder Boulder is offline
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Funny, the friend I mentioned processed two tapes for me, both were shot on a regular VHS tape with a mono camcorder.. but maybe the device still recorded the timecode. The camcorder was bought something like 13-15 years ago. The difference between a normal capture and a TBC'd capture was huge so it can't be just a better VHS unit being used
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