10-25-2020, 03:39 PM
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Hello,
This thread is as a reply to Lordsmurf. I am responding to a private message you sent me on October 6th, 2020 at 2:09PM.
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Originally Posted by lordsmurf
BTW, I can probably tell you about some odd rare errors. Not easy to recreate, but may prove interesting. As a taste, the most interesting is when the mode data is destroyed, so the tape doesn't know if it's SP, LP or SLP/EP. Weird stuff happens. But in the thread, not email, not PM.
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Do you have any additional information on this? I would love to know more about "some odd rare errors" because there is not much information about VCR errors
Quote:
Originally Posted by lordsmurf
It would help to understand VHS signal theory, and I know a few books you could read.
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Where can I find these books and can they be purchased online or downloaded? Would love to hear more from you!
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Someday, 12:01 PM
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10-25-2020, 04:07 PM
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Site Staff | Video
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Buy these:
- https://amzn.to/37K0SmT (VCR Troubleshooting and Repair)
- https://amzn.to/3mn2Aik (Video and Camcorder Servicing and Technology)
When reading, remember this is THEORY -- sometimes PRACTICAL APPLICATION will vary. Experience will tell you which is which.
I want to re-read both of these myself. I have crisp new copies that I bought in the 2000s.
I'd need to ponder weird errors for a bit. Some things are so unusual that I've only seen the error once in 25 years, and others have never heard of such a thing.
The primary cause of weird errors is nth gen, often what happens when an idiot meets a cheap VCR. But not always.
Just thought of one, have samples somewhere. The interlace is visually revsed, vibrates the picture. And then randomly unreverses, re-reverses, etc. The tape must be multi-captured, advanced Avisynth shifting. You can also cheat with drop-frame deinterlace and anti-alias, which is actually not bad (but not best).
Another is DV/MPEG-type blocks ... in a VHS tape, a decade before either existed. CCD/CMOS weirdness there.
I have a lot of sample, of lots of things, just not had time to share and catalog like I want.
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10-25-2020, 06:13 PM
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You want to see some weird $hit? Get a recorded VHS tape, Take it a part, disconnect the tape from the spools and flip the tape upside down and reconnect it back to the spools you can only do one spool at a time and you need a way to spool it outside the VCR. and play it back.
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10-25-2020, 08:08 PM
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In addition to the books, this JVC Techical guide has a lot if info about how the signal is stored on tape and how it's encoded/decoded (it's a bit old, so some of the noise reduction and chroma frequency/phase compensation circuitry may have improved and changed a little later). It's helpful to have some general idea about how a standard analog composite video signal is structured to make sense of it though.
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10-26-2020, 11:18 AM
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Quote:
Originally Posted by hodgey
In addition to the books, this JVC Techical guide has a lot if info about how the signal is stored on tape and how it's encoded/decoded (it's a bit old, so some of the noise reduction and chroma frequency/phase compensation circuitry may have improved and changed a little later). It's helpful to have some general idea about how a standard analog composite video signal is structured to make sense of it though.
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I see no download there, only a donate link, and instruction to send emails.
If you have this, please attach to this thread.
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10-26-2020, 11:55 AM
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The link is the VIDEO TECHICAL GUIDE text right of "type a", the website actually has a lot of high-res manual scans, but the interface isn't the greatest. I would attach it, but it's 120 mb and already compressed so I can't squeeze it down any further.
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10-26-2020, 12:16 PM
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Site Staff | Video
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I see the download link now. Thanks. Attached.
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