time base correction plugin ... is there one?

digilyd schrieb am 18.06.2020 um 09:25 Uhr

I have some old video that was transferred without timebase-correction because that fancy hardware was not available to me in 1985, it came from a Philips VCR. Is a timebase-correction plugin available, logically it shouldn't be all that complex to get the start times of new scanlines aligned, if it can be done in hardware it must be doable in software.

Kommentare

Musicvid schrieb am 18.06.2020 um 15:13 Uhr

Unfortunately, your captured file comes with the errors baked in. It can't be reversed. TBC is done in realtime.

The solution "would be" to recapture with a TBC capable hardware device, but I realize that isn't possible.

@johnmeyer has done some really good work with frame-by-frame alignment. May want to search some of his old posts.

Dexcon schrieb am 18.06.2020 um 15:26 Uhr

Philips VCR

There's a blast from the past. The first color VCR I ever saw was a Philips VCR circa 1980 or even a bit earlier. I am not sure that it was either VHS or Beta.

At my then employer (an ad agency), I had been using AMPEX VR7000s and then the later color AMPEX versions (I can't remember the model number) - complete with crash editing in both cases.

At the time, the Philips color VCR was a true revelation in technology.

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digilyd schrieb am 19.06.2020 um 18:08 Uhr

Unfortunately, your captured file comes with the errors baked in. It can't be reversed. TBC is done in realtime.

The solution "would be" to recapture with a TBC capable hardware device, but I realize that isn't possible.

@johnmeyer has done some really good work with frame-by-frame alignment. May want to search some of his old posts.


Hi,

when I look at the mpg video from the record on computer with my hardware video capture card it is obvious that the sides are "fluffy", ie the scan lines are there in their full length, so it does not to my way of thinking compute that this is impossible. It is "advanced" because it also has to fix audio speed variation, but if you can align the beginning of scan lines with  hardware then that must also be doable with software.

Mind you, I saw the original VCR cassettes when I made a safety copy of them in 1985 before returning them, the last thing that VCR machine did, it failed on a retry of a tape that I had tried and skipped as unplayable.

The original video was excellent, except that a certified TV-technician had been recording it and he had lighted up the lectures as if for plumbicon. The VCR system was for reasonably available light in normal rooms. IF video could have bypassed the RF output of the VCR and the RF input of the VHS then  there had been a much better result, the most overlighted of course clipped RF video. But that is an other tale. I did then the best I could do within my means. And it has not been without a reward, learning a lot about audio and video salvage.

The video I generate now will not be correctable as I clip to nice clean edges, but I still have the original salvage of the VHS and I still have the VHS tapes, most of the fluffyness of the edges may be from that machine, even though there are obvious errors from damaged VCR cassettes. Except for the idiotic pancaking in the cassettes to make them housewife friendly it was a good system.

Thanks both of you, it is more uphill than I had expected, some things are like that …. but trying a hardware tbc on the VHS copy would be possible … hmmm …. a new large frontier of ignorance opens ….

Musicvid schrieb am 19.06.2020 um 21:50 Uhr

I understand, and there seems to be a gray area for you between capturing with TBC and restoration of "whatever" result.

If you have a copy of the tapes, you can try again with a properly cleaned and aligned machine through an AVDC 300, which has good TBC. If the tape edge is wavy or there is visible coating loss, there is little you can do except frame-by-frame. I know of no software to do what you imagine, although I'm sure it exists on a commercial/forensic platform.

digilyd schrieb am 23.06.2020 um 22:08 Uhr

I think I will ask overspil.dk if they can digitize the vhs-tapes with a TBC then, most of the fluffyness seems to  be the best that generation of consumer VHS machine could do, thank you! - I just naively thought that such corrections would have gone digital by now. As I remember the image from the VCR-machine, it was impressively good, what was less good was having to do the transfer via antenna output and input, can't remember if it could have been done differently, just did what I actually could. If not, there had been nothing …. and no problem. Something that is bound to happen with lots of archives, impossible transfer logistics send them to the dump.