I loaded both files from post #46 into VirtualDub and honestly I can't see any white color clipping (VirtualDub set to Rec601, limited)
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I meant that if you use a VCR with TBC, you only have 1 A/D conversion (outside what happens in the VCR itself). When we compare your 2 captures, the standard flow is penalized. The "alternative" method includes TBC and A/D in the same device from what I have understood from your description.
Not what has been clipped during capture. In general, when you see a spike a Y = 255 it means that details are lost, and not recoverable. You can brig back data that are in the 235-255 range and that are clipped by the player or by the software or by the processing. For example if you need a RGB conversion somehow, you shrink the Y > 235 and well position the details that otherwise will be missed.
Yes, see my answer to Krazern. In general, if the DVD recorder acting as capture device ALSO features TBC correction, you have everything in one device, Then you can compare with the standard workflow using a VCR with TBC and a classic capture card. If you need to add a stabilization device as Krazern is doing in the standard workflow, the comparison is somehow unfair.
Data in the reange 235-255 can be easily recovered. But when you have a spike at 255 or a little bit lower, you already lost details, and these cannot be recovered. -
If you setp some frame forward you will see the accumulation of the whites: hyst.mp4
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Intrinsic quality consideration apart, what has not been lost can be "recentered" and the rest can be "cleared". What is lost, is lost. In this specific case is not that important, because we are talking about some stripes in the white lines; in other cases you can miss important details.
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No, you didn't really recover much. The clipped luma has just been shifted down to Y=216, but is still clipped as you can see from the solid lines at Y=216. The clipping is not catastrophic, buts it's there, killing details and gradients in that area.
Edit: and the colors are too bluish. But that's a different story. Something for post processing. In RGB it's mainly the blue which gets clipped.
Edit2: Attachment 2 added, same as above but correctly scaled.Last edited by Sharc; 19th Oct 2024 at 05:23.
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@Krazern, I haven't been following closely so may have missed it, but are you using the proc amp in your capture software to adjust your levels before capture?
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Of course i didn't recover much but the "standard" method didn't as well. Thats my point here.
https://imgsli.com/MzA5MTE0 -
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You do not seem to realize, I give up (is not that important, what needed has been said)
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From what I understand the B.E.S.T feature works at the RF level before the signal has any visual meaning, So I highly doubt it has any effect on the video visually (besides noise), RF is essentially like digital, good signal means the content is intact, bad signal means glitches in this case RF noise.[/QUOTE]
The operation of B.E.S.T/Video calibration is described in the attached JVC Video technical guide (VTG82081) and only notes adjusting deemphasis and noise reduction parameters though it's of course entirely possible they altered how it worked in later implementations.
That said changes in frequency response of the rf signal can also have some impact on the final softness/sharpness/ringing of the image output, though it will pretty quickly result in streaks and noise as well if it's too off. (Can be observed if you mess with the rf eq trimpots on an older vcr) -
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"Natural colors" of analog VHS (S-VHS) video is a topic of its own as much as a personal preference. I usually start with a white balance check/adjustments and then apply some more color grading to make home VHS look "more natural" - as good as it gets and fits my preference.
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