12 March 2013, 14:18 | #1 |
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VideoBackup - restore in Winuae ?
Hello, is there any chance I can return data from my VHS tapes - Videobackuped 10-15 years ago back to Winuae ?
For example grab the video to AVI or MPEG and then use in winuae ? Can be videobackup HW emulated in winuae (or is it already?) so for example I start videobackup software, put MPEG as input and it will load data ? |
12 March 2013, 14:39 | #2 |
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Time to rewrite VBS for modern OSes and skip the WinUAE part. :-)
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12 March 2013, 15:06 | #3 |
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Also, MPEG is a lossy codec, I wouldn't use that, it will probably yield data corruption. You need a lossless codec.
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12 March 2013, 15:11 | #4 |
HOL/FTP busy bee
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Storing digital data as a backup on a VHS tape deserves a Darwin award to begin with, but after 10+ years... I honestly wish you all the best that you can restore anything
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13 March 2013, 00:08 | #5 |
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@TCD
If it's been stored in the correct conditions it may be ok. If not - as you said "Good luck" Dave G |
13 March 2013, 00:20 | #6 |
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I can't think of a more 'instable' medium for storing data than VHS or audio tapes, but if there is an easy way to implement it in WinUAE and the tape can be recorded in a way to enable reading the data, I'm the last person to be against that feature Just... the person that offered this method in the first place 'because you can'... deserves the Darwin award for 'awesome ways to store your backups'
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13 March 2013, 00:27 | #7 |
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13 March 2013, 05:32 | #8 | |
old bearded fool
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After reading up a bit on VBS, as Jope mentioned. I think the backups should stand the test of time just fine, much better than most modern software used for backing up files.
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13 March 2013, 08:58 | #9 |
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VBS uses very high serial bit rate (~600 000 bps+) and 9-bit serial mode (1 start bit, 9 data bits, 1 stop bit) which is incompatible with standard PC serial ports.
Someone would need to write VBS "simulator" that reads captured video directly. |
13 March 2013, 09:04 | #10 |
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Just capture the video when played on a VHS to a lossless format!
Am I missing something? |
13 March 2013, 09:23 | #11 | |
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Quote:
VHS combined with proper error correction should be quite recoverable today, once you get the head tracking properly aligned with the backup tape. IMO, VHS backup was a good solution back then as it offered high speed backup and lots of space for a low price since most people already had the player. It might not have been perfect, but it was preferable to floppy backups which would have been the alternative. |
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13 March 2013, 09:33 | #12 |
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Reading modrobert's post, doing a bit of looking up how much data capacity a VHS can hold and your argument I've changed my mind too It's mainly about how you store the data on the VHS and the error-correction indeed makes a huge difference regarding standard home recorders and tapes.
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13 March 2013, 09:45 | #13 |
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You can get reliable data storage from any medium, no matter how unreliable it really is. It is simply a matter of trading storage space for reliability. A CD is also a good example as the raw data is about 3x as big as the data you can put on a data CD, due to the massive amounts of error correction it uses.
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13 March 2013, 10:10 | #14 | |
old bearded fool
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Quote:
That should work, good idea. Just need to code something to handle the lossless format chosen. |
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13 March 2013, 10:20 | #15 |
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13 March 2013, 10:56 | #16 |
old bearded fool
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FYI: I sent an email to Hugo Lyppens, the author of VBS (Video Backup System Amiga), asking for the source code.
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13 March 2013, 10:59 | #17 | |
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13 March 2013, 11:18 | #18 |
HOL/FTP busy bee
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I'd also assume the ratio would be around the 1/100 mark. Thanks for that figure Maybe someone can tell that used the software how much space was available?
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13 March 2013, 11:27 | #19 | |
old bearded fool
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I haven't tried VBS, but this was on the same page I found the other info.
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13 March 2013, 18:54 | #20 |
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I seem to remember one of my Amiga buddies of yore using this. I was curious why TCD thought this worthy of a Darwin award. Seems like a great way to not spend loads of money on proper SCSI tape drive or whatever real back up system. VHS tape may be a crappy medium for analogue video but as has been said, a decent encoding method for digital data and this type of tape should be totally servicable. Could this type of tape even be better in terms of noise immunity and decay because being designed for analogue signals it would need a high dynamic range?
I'm trying to imagine how it worked though. Did the software actually generate a video signal recorded to VHS via composite or even RF? If so I'm having more trouble imagining how you recovered the data. I can't imagine you did it with a frame grabber As for getting it back now, I think you might need a quality video capture card since you need the raw frames. Any compression would destroy the data which probably rules out any cheapy USB capture devices. |
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