How To Transfer Video from miniDV tape to DVD
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How To Transfer Video from miniDV tape to DVD

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 How To Transfer Video from miniDV tape to DVD How To Transfer Video from miniDV tape to DVD Document Transcript

  • Re: convert VHS to DVD Re: convert VHS to DVD Source: http://linux.derkeiler.com/Mailing−Lists/Fedora/2007−03/msg01609.html • From: Tim <ignored_mailbox@xxxxxxxxxxxx> • Date: Tue, 13 Mar 2007 19:35:01 +1030 Mike McCarty: Actually, usually to remove MacroVision, one needs to *remove* the quot;extraquot; sync pulses it puts in. :−) It probably would have been best if I'd described the restoration technique more accurately: You replace the syncs signal *and* vertical blanking period. That takes care of almost everything in one go. Macrovision may also play silly buggers with the chrominance stability, most televisions don't notice it, but some VCRs do (you get weird colouration distortions). I fixed up the odd tape or two by playing it through a $3000+ analogue vision mixer, it replaces everything outside of the horizontal and vertical blanking periods with internally generated ones, and DC−restores the signal. But that's not the sort of equipment that the average person has to hand. I work in video production and got sick of crap playback, so watched some movies through the desk. I hadn't actually had a proper look at how Macrovision buggers up the signal, my CRO wasn't brilliant at that sort of thing. I now have a proper video waveform monitor, so I'll dig a disc out and have a look using the delayed sweep. You won't get a purpose−built quot;de−macroquot; box, not because of a patent reason, but because of anti−piracy laws about circumventing such things. Ah, but quot;Video Clarifiersquot; and quot;Video Stabilizersquot; are quite legal. Many TVs don't deal well with the AGC fiddling done by MacroVision, anymore than do tape recorders. AGC issues are more to do with when there's a VCR between the player and the TV set. If you connect a player to a TV set with a direct video input, there's no AGC in the path. Macrovision's varying pulses (they Re: convert VHS to DVD 1
  • Re: convert VHS to DVD transcend upper and lower legal video values) upset the AGC in VCRs, and can also upset the black level clamp in anything (VCRs or TVs) that isn't able to ignore video signals during the blanking periods. There is a simple circuit which needs a couple of pots adjusted which kills most versions of MacroVision pretty handily. I haven't built it, but I've looked over the circuit, and it should work. http://www.hobby−electronics.info/projects/MacrovisionKiller.html Hmm, output stage looks a bit simple, but a quick perusal at it looks like it'd do the job. The kit I built was really only designed to make it okay to watch a Macrovision−bastardised signal, rather than let you record it. It did what it was built to do pretty well. That was really all I was after, to be able to watch a movie on any telly set in the house, and without needing an expensive dongle. They also have disclaimers on them, like quot;This device is not for making illegitimate copies of copyright material.quot; I've got a couple of old monochrome reel−to−reel video recorders with a badge stating the same thing riveted to them. ;−) I think the old Umatic we had did, as well, but I got rid of that years ago. I'd have to dig out the service manual to see if it listed it as a part. ;−) DRM − Deny Replaying of Material... −− (This PC runs FC4, my others FC5 & FC6, in case that's important to the thread) Don't send private replies to my address, the mailbox is ignored. I read messages from the public lists. −− fedora−list mailing list fedora−list@xxxxxxxxxx To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora−list Re: convert VHS to DVD 2