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Perhaps hard to tell from the sample, but about 6 lines down, there is rainbow head-switching noise. Is it normal for the 1980 to show this on top? It should also be noted that the bottom noise is only 2-4 pixels. I have no issue cropping it out, just seems odd.
Thanks. http://www.digitalfaq.com/forum/atta...1&d=1436926026 |
Well within the crop range, I wouldn't worry about it. Also, you have some obvious chroma ghosting, likely from the DNR circuit.
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So is this with all tapes played in this VCR?
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Premiumcapture PM'd me the other day asking whether my SwitchHead function could be altered to work on the top of the image instead. I'm guessing it was related to the topic of this thread. (Note: As I allude to in the link, this still won't actually work properly with interlaced video, but for telecined animation like this it shouldn't cause problems.)
In theory the two functions (bottom and top) could be combined, but I can't bothered since this is a one-off. Admin refused to unhide hidden content nothing will help to see hidden content There is some random magenta at the top, but in the screenshot it's nearly invisible. Maybe you don't want to keep the original top color in the actual video itself. Code:
ImageSource("Switch Noise.png").ConvertToYV24() |
Exactly what I was looking for - thanks a lot!
I noticed it still treated the bottom - is it running the method twice in different places? Also, what do you recommend as a chain - looks like I could probably detelecine here and apply it, but for straight 59.97i, does QTGMC followed by this sound right? Thanks again |
The script is included in the post, including comments identifying each stage of processing. Yes, I ran it on the bottom two lines in addition to the separate top pass.
You don't need to deinterlace for proper interlaced handling in this case. You can SeparateFields, run the filter, then Weave. I was intending to include that as part of the function, but thinking about it, things would get confusing when you're looking at the full interlaced frame and wanting to correct an odd number of lines. I think advising the user to Separate and Weave is preferable. |
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As someone who doesnt pull AviSynth scripts from forums all that often, I am having difficulty actually copying this and keeping the formatting. I am not sure that it even affects how it runs, but notepad and wordpad seem to hate it, which I have traditionally used for scripting. Is there a best way to copy this? |
Well that's certainly annoying. I think it's an interaction between the CODE tag and the Javascript that adds the "Read more" link to the end of all copy-pastes.
In future, you can work around this by hitting the QUOTE button and then copying from the reply text box. This bypasses the Javascript. I didn't save the script file, so I used this workaround to re-post it on Pastebin for you. |
Chroma offset and chroma noise is partially to blame here.
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AG-1980 flashing color lines at top of video
Having experienced this myself now, I can say that it's indeed related to head-switching noise.
For some reason, the AG-1980 outputs this chroma error at the top of the image when the head-switching point is set "too low". The error can be removed by adjusting a potentiometer to raise the switching point higher into the bottom of the frame. But then of course, you will see more skewed lines at the bottom. In theory, for particularly important content, you could do two captures and combine them:
I'll try this later. |
Why not just adjust the PG Shifter pot viewing the image on a display showing the overscan? I usually have to set up any VCR I buy as the PG is always to high or low. Saying that you can actually adjust the PG for each tape so you won't have to crop any of the image. The position is not always the same as it depends on the setup of the recording VCR.
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With some of my recordings, it seems that no position of PG Shifter can keep both the top and bottom of the image clear in the case of the AG-1980.
With the Panasonic PV-S4670, I also just noticed that the top 10-15 lines of the image are very slightly brightened in the cap where I removed the noise from the bottom. Whereas they are correct in the cap with HSW noise where PG SHIFT was at its original position. But it's possible there is a good position for that one. I haven't tried since noticing this artifact. Very subtle. Do you know specifically why it varies based on the recording VCR? Is it due to the recording VCR's PG adjustment? |
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I don't know about AG1980, nothing like that in PAL region - but on my Panasonic F70 I can shift the PG out of the visible image most times. I have added an external pot with knob and flying leads so I can adjust without taking the lid off. |
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Can you provide any more info on your mod? The AG-1980 trimpot is actually on the bottom because the mainboard is mounted upside-down. Very awkward to adjust. Would be nice to have it externally controllable. |
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FS200 G Deck, AG-1980 K deck (huge mechanical difference) FS200 does not have regular capacitor issues, AG-1980 has on almost all units. FS200 has no SMD caps. Internal PCB's are completely different shape. FS200 has different front panel controls and layout to AG-1980 (AG-1980 is closer to FS100) FS200 is from 1992, AG-1980 is from 1995 FS200 has very different remote with jog and shuttle built in and supplied with barcode reader I will share how I did my mod, but really need to tidy up the work so as it looks good enough to share here - looks a bit scrappy at the mo! |
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But so is the NV-HS1000. Is that one more mechanically comparable to the AG-1980? I've never had a chance to own these. My informatino on PAL Panasonics comes from several knowledgeable peers. My hands-on PAL is with non-SVHS Panasonics (mostly worldwides) and JVC S-VHS models. So I will defer to you on this exact subject. |
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Someone with both PAL and NTSC units needs to do a proper evaluation, find out what is what, but that would not help with converting old tapes to digital so it would just be a by-the-way. HS1000 is different to FS200 (I have both). FS200 is more 'old fashioned' in its image, less cleaning, but has the better mechanism with brass impedance roller - the HS1000 is less tolerant of worn tapes. Anyone in PAL area have an AG-1980 and FS200 to compare? |
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