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smally_uk
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Post subject: Re: (WIP) Laserdisc software image decoder from raw signal Posted: 22 Oct 2021, 09:41 |
Shows curiousity |
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Joined: 20 Jan 2010, 23:33 Posts: 24 Location: United Kingdom Has thanked: 15 times Been thanked: 3 times
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laserdisc.ws wrote: Yep, my bad - I was thinking about the fact it has three video outputs, but one of them is RGB! The RGB decoding on the 4300 is pretty bad with an analogue comb filter and is very basic. laserdisc.ws wrote: Sure a MUSE player with its red laser could in theory grab more info - in particular with laser rot discs; still, even if I was an experienced welder (and I'm not) I would think not twice, but dozen times, to open up a MUSE player to mod it! There have been a few people with X9/X0 players moded and the results are a bit hit and miss. Due to the different wavelength of the laser they are better at reading rot as you said but also with the smaller dot on the surface of the disc there is also less crosstalk. The downside to this is that it it much harder to calibrate as you can only truly calibrate the MUSE players with a MUSE calibration disc which will cost you more than an X9 anyway... One of the moded players is in Japan and was recently serviced by Pioneer and still has difficulties playing some discs (I dont think they have the experts there any more) If you are looking to capture rotted discs the best bet is do what we did with the BBC Domesday discs and just capture lots of them in calibrated players and then stack the results. With a stack of 7 very rotted discs we have a signal to noise ratio better than what you could get with a MUSE player anyway AND.... there are no dropouts in the final result. Obviously if you captured 7 copies in a muse player you will probably get better results but one of out tactics is to capture the same disc in multiple calibrated players if at all possible. This removes the player from the equation. laserdisc.ws wrote: Forgot to ask: how many GBs is a raw captured per hour - more or less? If you capture with the Domesday Duplicator you are looking at 180GB/hr for the capture but this can be then compressed down to 75-90GB
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laserdisc.ws
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Post subject: Re: (WIP) Laserdisc software image decoder from raw signal Posted: 22 Oct 2021, 11:49 |
Serious fan |
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Joined: 05 Mar 2012, 03:43 Posts: 178 Location: Italy Has thanked: 16 times Been thanked: 10 times
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smally_uk wrote: Our 4300d's are in superb condition as mine had less than 200 hours on the player from new. and do actually outperform a traditional capture from the X9 on good discs.
_________________ FanRes - restoring wrong movies, one title at the time! blog.spoRv.com - a blog about video restoration…
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rein-o
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Post subject: Re: (WIP) Laserdisc software image decoder from raw signal Posted: 22 Oct 2021, 14:28 |
Jedi Master |
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Joined: 03 May 2004, 19:05 Posts: 8107 Location: Dullaware Has thanked: 1221 times Been thanked: 845 times
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laserdisc.ws wrote: smally_uk wrote: Our 4300d's are in superb condition as mine had less than 200 hours on the player from new. and do actually outperform a traditional capture from the X9 on good discs. :shock: This one made my laugh Off to painting my house today, wish me luck, maybe it will look as clean as an old house can
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lonerangerface
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Post subject: Re: (WIP) Laserdisc software image decoder from raw signal Posted: 22 Oct 2021, 14:35 |
Honest fan |
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Joined: 23 Dec 2019, 20:45 Posts: 88 Location: United States Has thanked: 0 time Been thanked: 11 times
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smally_uk wrote: If you capture with the Domesday Duplicator you are looking at 180GB/hr for the capture but this can be then compressed down to 75-90GB When I capture LD's with the ADVC-110 and a software like Premiere Pro or WinDV, I get around 13GB/hr. Either that or it depends on the quality of the source. Anyway, for capturing US releases, I toggle the NTSC Setup Level to 7.5 IRE, whereas for capturing JP releases, I toggle to 0 IRE.
Last edited by lonerangerface on 22 Oct 2021, 23:45, edited 1 time in total.
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laserdisc.ws
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Post subject: Re: (WIP) Laserdisc software image decoder from raw signal Posted: 22 Oct 2021, 16:59 |
Serious fan |
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Joined: 05 Mar 2012, 03:43 Posts: 178 Location: Italy Has thanked: 16 times Been thanked: 10 times
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smally_uk wrote: For the 180GB / hour, that is the RF capture and not the final video output which can be in any format that ffmpg can support. How much time would take, roughly, to decode raw capture to final video and audio tracks? I mean, are we talking about minutes or hours?
_________________ FanRes - restoring wrong movies, one title at the time! blog.spoRv.com - a blog about video restoration…
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titan91
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Post subject: Re: (WIP) Laserdisc software image decoder from raw signal Posted: 20 Dec 2021, 00:07 |
Honest fan |
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Joined: 14 Jul 2019, 02:53 Posts: 81 Location: United States Has thanked: 10 times Been thanked: 4 times
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I'm back for a bit. Not trying anything else with LaserDisc at the moment as I'm using vhs-decode on some tapes for a friend. That being said, I was able to borrow a few discs from someone else (Led Zeppelin concerts, etc, some barely played). The issue I had last time I tried was significant crosstalk at the end of a CLV disc, Sony's Take Two sample. Now when I first played that disc, it was warped so much that it was intermittently grazing against the top cover of my "good" player. So I flattened it with 50 pounds of books for a few weeks and immediately captured it again as soon as I took the books off.
The decoding result was more or less the same, which leads me to believe it's a laser alignment problem. The disc no longer grazes the top cover of the player when played, IIRC. So eventually I'll play a few of these other discs I just got to confirm that. If it is alignment, I'll have to painstakingly adjust the alignment pot little by little between discs (I can't access that potentiometer on my machine when playing that I know of).
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cplusplus
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Post subject: Re: (WIP) Laserdisc software image decoder from raw signal Posted: 21 Dec 2021, 04:04 |
Hardcore fan |
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Joined: 13 Aug 2018, 03:18 Posts: 1520 Has thanked: 449 times Been thanked: 588 times
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titan91 wrote: If it is alignment, I'll have to painstakingly adjust the alignment pot little by little between discs (I can't access that potentiometer on my machine when playing that I know of). You'll need to use an 8" disc. If you are making RF captures though, you really need to check for crosstalk with test disc since this will be in the capture. Severe amounts from warp or tilt servo issues are blatantly visible, but slight amounts are hard to see without the test patterns and manifests itself as background noise that is not actually characteristic of the player.
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titan91
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Post subject: Re: (WIP) Laserdisc software image decoder from raw signal Posted: 20 Jul 2022, 14:53 |
Honest fan |
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Joined: 14 Jul 2019, 02:53 Posts: 81 Location: United States Has thanked: 10 times Been thanked: 4 times
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Harry posted these Apple CPU results a while back. Not really too different from my Ryzen 7 CPU. Quote: 5fps - M1
6-7fps - M1 Max (top model 4TB NVME)
Observed under a Ubuntu 20.04 LTS VM
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ld_out
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Post subject: Re: (WIP) Laserdisc software image decoder from raw signal Posted: 06 May 2023, 17:00 |
Third post and above |
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Joined: 03 May 2023, 01:52 Posts: 3 Location: United Kingdom Has thanked: 0 time Been thanked: 0 time
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Hi everyone, Hope you're all doing well! I'm new here having just signed up, for reasons like many of you do I didn't know where else to ask, especially since Domesday Duplicator and has been discussed by users to fabricate PCB (which unfortunately never came to fruition ) Although I am very new to the premise, I myself am interested in creating a board for myself for the project (and hopefully the VHS variant), but I came across the GitHub page: https://github.com/simoninns/DomesdayDuplicatorand I just don't know where to start. There's so many files, documents, I just don't know which or what to use! I absolutely LOVE what these guys conceived and I really would like to try it out, thus I was wondering if anyone here can help me out on this matter?? Hope you don't mind me asking, I would be very grateful and appreciative too!
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