DVL-Digest 1505 - Postings: Index DV - SP v. LP - (2) erasing dv tapes? External enclosures (was Pioneer Drops price on DVR-A05) Panasonic AG-DV2000 stuck on "AV3" input Pioneer Drops price on DVR-A05 - (2) - (3) What are the true DV specs(slightly OT)? What are the true DV specs? - (2) - (3) - (4) - (5) DV - SP v. LP - "Perry Mitchell" From: Ton Guiking No, as far as I know the head is the same but the safe guard or so along the tracks is left out, so tracks are very close to each other. Which can lead indeed to drop outs and / or problems with other units, since the margins are very small now. FWIW DV - SP v. LP - "Don Mitchell" isn't it true that only 'pressed' CDs actually have 'pits?' I thought the sort of CDs we burn have only areas in which the dye reflects laser light differently, thus behaving as if they were 'pits.' DM "What happens is that the bits [the 'pits', the physical ones.- T.G] are burnt less exactly on their place then with a ready made (officially pressed) CD (or the opposite can happen: they are more exactly burnt). erasing dv tapes? - "Perry Mitchell" From: Joe Parker >If you insist on risking taping over old footage, buy a degausser. Note that miniDV tapes are *very* difficult to erase. Our experience has been that nothing short of machines specifically designed and advertised for it will do the job. And they're generally > USD. Not cheap. External enclosures (was Pioneer Drops price on DVR-A05) - "Perry Mitchell" From: Mike Thanks Perry. Looks like that ones firewire or and USB2 so I wouldn't even have to make a choice :-) I'm wondering if you or anyone else has come across a swapable external enclosure that will work with both 3-1/2 format (hard drives) and 5-1/4 (DVD burner). My ideal would be to add one external enclosure which I could use for a DVD burner and an extra external drive or two (when funds allow :-). Panasonic AG-DV2000 stuck on "AV3" input - "Crittenden, Jan" From: Michael Bender [mailto:Michael.Bender@Sun.COM] Sent: Monday, April 28, 2003 3:44 PM To: DV-L Subject: [dv-l] Re: Panasonic AG-DV2000 stuck on "AV3" input Hi all, Back a while ago I wrote that my AG-DV2000 was "stuck" on input "AV3" and the input couldn't be changed. Also, the clock would never keep time over a power-cycle (AC removed and restored) and other settings in the deck, such as the SP/LP settings, wouldn't stick. I finally dug out the service manuals for the deck and opened up the skins, and sure enough there is a 3V lithium battery behind the front cover. That battery is used to provide backup power to the clock/calendar chip as well as to some non-volatile memory that is used to keep some of the deck's settings. The battery read almost zero volts, which was strange since the deck is only a few years old. Perhaps I just got a bad battery when the deck was made? Anyway, removing the battery and discharging the capcitor that was across the backup power line, then reapplying power to the deck fixed the input select problem (although it can still select input "AV3" as one of the choices!). I temporarily installed a 3V lithium button cell from Radio Shack and powered the deck back up, and sure enough everything worked (execpt that I could now also select "AV3"). Replacing the battery is a big PITA, since you have you remove the front bezel, which if you don't do carefully, you can easily break some of the plastic clips. Then, the battery is soldered into the PCB (not socketed) - you would think that after two decades of the PC world realizing that it doesn't make sense to solder in a backup battery that Panasonic would have learned as well, but nooooooooo... I am going to install a battery holder and move the holder and the battery to inside the deck proper so that to replace the battery all I have to do is to remove the top cover, and not deal with trying to get the front bezel off. So, hopefully if anyone else ever runs across problems where your AG-DV2000 deck is acting strangely, a battery replacement might be all that's necessary. Now, I still wonder about the "AV3" input selection - I suspect that was to allow selection of the internal off-air tuner that I have heard some AG-DV2000 decks were fitted with (outside the US I think). Anyone want to hazard any other guesses? Jan? Got any inside scoop on this? mike -- Pioneer Drops price on DVR-A05 - "Perry Mitchell" I think there is general confusion about whether putting your own drive in a Mac will 'switch on' the iDVD application. A Google search will find loads of confused punters on the topic! I thought by the way that Apple were switching to the Sony dual format burner as their new 'SuperDrive'. Perry Mitchell Pioneer Drops price on DVR-A05 - "Perry Mitchell" From: Robert Rouveroy I'm not confused anymore. Just installed the DVD internally in a G4, piece of cake, started up and burned me a DVD on Toast, perfect!! Pioneer Drops price on DVR-A05 - "Perry Mitchell" From: Mike Hi Perry, I've been shopping around for an external DVD burner to use with my laptop (either already assembled or separate drive and enclosure). Which enclosure do you have and are you happy with it? Is firewire a better way to go than USB2 or does it not matter? What are the true DV specs(slightly OT)? - "Perry Mitchell" From: Vidiot >Can I add a question to this whole discussion? I have shot a feature >length film in DV. I like the way the full-frame DV looks, without the >NTSC cut off at the sides. In FCP I find that if I reduce the image >size to about 95% and play it on an NTSC display (also record it to VHS >and play it back) I get a slightly letter boxed image with the full DV >frame. It looks like a 3:2 ratio on a 4:3 screen. I see no image >degradation, but this is my first real film and I may be missing >something. But it looks good, and I wonder if this would be an >acceptable way to send the film to festivals and show it to potential >buyers. The ratio is, as far as I can tell, the exact ratio of a 35mm >still, which I find more pleasing than 4:3, and it doesn't seem to get >me into the whole set of problems associated with 16:9. (It's a little >wider than 16:9, actually--16:8. It also uses all of the image recorded >by the camera. Are there compelling reasons not to do this? >Thanks in advance, >Francois Camoin Don't do it. While you'll get more of the shot image on the screen, you'll be sorry when you project it, as most projectors go out to the edges. That means you'll have nice black bars all around the image. Also, by squishing it, you lose resolution. DON'T DO IT. MB What are the true DV specs? - "Perry Mitchell" From: Richard H. Heeren If NTSC DV is specified as 720 X 480 pixels (1.500000 aspect ratio) then how is it scaled to NTSC output? Is it scaled exactly as a 4:3 aspect ratio (1.3333333333 like 640 X 480 pixels) which would then give it non-square pixels of 0.88888888889 to 1 (NOT 0.90000), or is it scaled exactly as non-square pixels of 0.90000000 to 1 giving it an NTSC output aspect ratio of 1.350000000 (like 648 X 480 pixels)? I have been one who has been operating under the assumption that the DV 720 X 480 pixels were scaled to exactly a 4:3 aspect ratio with the non-square pixels being 0.8888888889. If Adobe says to use 720 X 532 pixel images instead of 720 X 540 pixel images to import into Premiere then this is an aspect ratio of 1.35338459 with not square pixels of 0.902255639! So what are the TRUE DV specs??? Anybody an expert in these matters here? The RIGHT answer to these questions will effect what square pixel images should be sized to or scaled from before importing into Premiere for DV's non-square pixel image size. What are the true DV specs? - "Perry Mitchell" From:Vidiot >3) A cropped DV frame (486>480) is thus representing a maximum 4:3 image >width of 704 pixels. Then explain the MPEG-2 video that I can receive via satellite from CBS, UPN and NBC that uses 720x480, while Warner Bros. uses 704x480. I'm talking about the network to affiliate feeds, not any kind of consumer junk. What are the true DV specs? - "Perry Mitchell" From: Vidiot What I was talking about had nothing to do with DBS, but with US network distribution of programming, by those networks that are using MPEG-2 for delivery. The network wouldn't have to do anything. Thinking about it, the encoder would just take in the NTSC line and sample it to get 720 pixels, just like DV does. For those encoders where they want less data over the MPEG-2 stream, they just sample the line for 704 pixels. Who cares if you sample the input scan line at 360, 480, 704, 720 or 1440 pixels. Upon playback, the DtoA will still fit it in the NTSC scan line. BTW, 720 is divisible by 16 as well. :-) I truly believe that all 720 pixels are used, just like when I take a DV file and use it to create DVD MPEG-2 files. I use all 720 pixels. After I posted the query, I did some rethinking. It is obvious that the MPEG-2 encoders will use all available pixels told to use. What are the true DV specs? - "Perry Mitchell" From: Vidiot >Sure all 720 pixels can be used, but not as part of the 4:3 frame. I'll >repeat an earlier point I made which you may have missed - Sony pro cameras >usually provide an 'extra bit on the side' to give picture information on >all 720 pixels, Panasonic pro and most consumer cameras do not leaving the >pixels blanked (black). My JVC consumer miniDV camcorder fills ALL 720 pixels with image info. There are no black bars on the left or right. My DSR-20 fills all 720 pixels. Take a look at http://vidiot.com/Fox-4x3-TestImage.bmp It is an untouched DSR-20 frame grab of the analog input to the DSR-20. It exactly matched what I was seeing on my little B&W underscan monitor. What are the true DV specs? - "Perry Mitchell" From: Vidiot >The DSR-20 will simply record what it is given via the Firewire, but if you >are saying that it records all 720 pixels when presented with an analog >signal then this is wrong and it is stretching and thus distorting the >aspect ratio. I have just tried this on my DSR-11 and this definitely >preserves the blanked pixels when fed with an analog source. It has to record something on all 720 pixels :-) Did you look at the image I referenced? If not, here it is again with 2 more: http://vidiot.com/Fox-4x3-TestImage.bmp http://vidiot.com/DSR11-PAL.bmp http://vidiot.com/DSR20-NTSC.bmp http://vidiot.com/DSR20-NTSC-UPN.bmp Maybe it is a miscommunication by what you mean by blanking the pixels. All three of the images have active pixels, not something hard set to 16. On the DSR11-PAL image, which I just got from Bevis this weekend, there are indeed black vertical bars, but they are from the actual analog input, not hardcoded by the recorder. The same for the DSR20-NTSC image, which I recorded from the Warner Bros. 4:2:2 704x480 MPEG-2 affiliate feed. The DSR20-NTSC-UPN image is from the UPN 4:2:2 720x480 MPEG-2 affiliate feed. All 720 pixels came from the analog input to the DSR-11 and DSR-20. The black bars are from the active video fed the decks. I have no answer as to why 20th Century Fox had the 4:3 test image all the way out to the edges. There regular video feeds also have the black vertical bars. (diese posts stammen von der DV-L Mailingliste - THX to Adam Wilt and Perry Mitchell :-) [up] |
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