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6th October 2011, 19:08 | #1 | Link |
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Black lines extend right on VHS
You can see them here, despite using my multipass technique:
http://screenshotcomparison.com/comp...4395/picture:3 Anyone found a way to get rid of them? They seem to be on sharp luma transitions. This video is still pretty bad even when cleaned up a huge amount by multipass. @yup you worked on this? |
7th October 2011, 06:45 | #4 | Link | |
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7th October 2011, 12:43 | #5 | Link |
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Easy, just record it 9 times and take the median
What's left is purely the original tape/camera noise, I guess. temptr Are you sure you viewed the pic with the mouse over it? That's the clean version. Last edited by jmac698; 7th October 2011 at 12:50. |
9th October 2011, 11:59 | #6 | Link |
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Do they shift from frame to frame? If so, I think I'd try TemporalDegrain or Didée's script for single frame spot removal. With the spot remover, medianblur seems to be faster, but I suggest to use version 0.5 as the latest version was causing x264 and QuEnc to crash.
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9th October 2011, 14:17 | #8 | Link |
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G
Thanks for the advice, however this VCR plays other tapes fine. This is the first tape I've seen with the white lines, originally, which ppl on the internet call dropouts. I have to talk to yup, he made a mask for this problem. |
9th October 2011, 15:39 | #9 | Link |
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Yes, I know, but dropouts are the problem of the tape, while these lines of yours are not dropouts. Most VCRs have a dropout correction/masking circuit.
Of course, it may be that the recording VCR had problems and if these are part of a signal you can only hope for a correction in SW. BTW, have you tried the tape in another deck?
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9th October 2011, 20:18 | #10 | Link |
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yes in 5 decks actually, by far this was the best result. I have seen the black lines before and recreate them, though I think from another reason. If I record svhs-et and playback in a non-et vhs I get the same look.
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9th October 2011, 20:22 | #11 | Link |
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Have you tried manually adjusting the tracking control? This sure looks like a tracking problem. On most VCRs, tracking can be manually adjusted by pressing either the Channel UP or the Channel DOWN button on your remote control while playing the tape (the tape has to first be playing before you press these buttons). I think this might solve the problem.
The other thing to try on your VCR, when capturing, is to see if it has an "EP correction" circuit. On JVC decks, this is called "Video Stabilizer." It is NOT a TBC, and it only works on EP (6-hour) mode recordings. I am less confident that this will improve your capture, but it is worth a try if the tape is EP. Again, this looks like something that can be corrected by using manual tracking. |
9th October 2011, 20:55 | #12 | Link |
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Hi,
Yes it was captured by adjusting the tracking for each scene. This did affect the white lines noise, I could minimize it. Of course I can completely eliminate the white lines with my multipass technique, but the black lines continue. The black lines are fairly consistent, which is why that even after 9 captures I can't eliminate them. Actually I have given the tape back to the customer now, I have a half dozen captures lying around, they all have the black lines. |
10th October 2011, 02:54 | #14 | Link |
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ps I have an SVHS JVC with tape calibration, actually that didn't end up being the best deck. It seems one deck will be best for each kind of tape.
Let me try some of the suggestions here; I think depulse could be adjusted to find black lines instead of white lines for one thing. |
10th October 2011, 07:05 | #16 | Link | |
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10th October 2011, 14:44 | #17 | Link |
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Assuming your VCR is not at fault, then I bet the tape was recorded with a worn head. A similarly worn head may play it back just fine.
I know that's no help - just sharing! You mention yup - have you seen his thread about this? I think the lines are too clustered together for his approach to work, but I don't know. Cheers, David. |
10th October 2011, 23:46 | #18 | Link | |
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Quote:
http://forum.doom9.org/showthread.ph...14#post1355414 EDIT: Added the missing default values to the linked post.
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I sometimes post sober. StainlessS@MediaFire ::: AND/OR ::: StainlessS@SendSpace "Some infinities are bigger than other infinities", but how many of them are infinitely bigger ??? Last edited by StainlessS; 11th October 2011 at 00:18. |
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12th October 2011, 13:07 | #19 | Link |
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Please see http://forum.doom9.org/showthread.php?t=121197&page=3 for a specific script developed by yup for removing these black lines.
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