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Sony VX2100 / PD170 / PDX10 Companion
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Old April 24th, 2003, 09:38 AM   #16
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excuse my ignorance

Reading one of the posts:

'use Sony Premium miniDV and shoot DVCAM'.

What does that actually mean? I use mini dv tapes but whats shooting in DVCAM?

Also, do you lose any quality using the long play option on a tape?
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Old April 24th, 2003, 07:53 PM   #17
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Trent, remember these are all zeroes and ones being recorded so that the material of the media will not really have an impact on the video quality, with the exception of maybe drop outs, if using a real bad tape. DV and DVCAM are formats and MINI DV is the physical type of tape(media). So they are saying if you buy the DVCAM tapes, shoot using DV (setting on the cam) in order to get more shooting time on the DVCAM tape.

The loss in quality, I'm not too sure about, but it may deal with the change of bit rate or the increase of compression applied to the video. I guess using LP, may utilize a higer compression rate in order to fit more video.
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Old April 24th, 2003, 08:31 PM   #18
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The DV format (including DVCAM) uses 5:1 compression. The tape length is the same, but the speed the tape moves across the video heads changes. If you slow the tape speed down, you can record longer. However, tracking and playback on different machines can be problematic. It is best to avoid LP speed if at all possible.
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Old April 24th, 2003, 08:46 PM   #19
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Jeff how then can the data rate stay the same if the tape is playing slower? Not being a smarta$$, I'm curious...If the file size will ultimately be the same how can the data rate not change if the physical tape is moving slower?
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Old April 24th, 2003, 09:01 PM   #20
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The tracks that contain the data are written closer together. The guard bands (blank space between tracks of data) become narrower. That is what make tracking more problematic. The head must now nearly perfectly align with the data track. Even slight misalignment can cause error correction to kick in and degrade the picture
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Old April 24th, 2003, 09:27 PM   #21
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Great explanation, I got it now. Sorry for postulating inaccurate data, but it made sense...right? Anyway, thanks Jeff. Lastly, wouldn't narrower=greater possibility of dropouts
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Old April 24th, 2003, 09:37 PM   #22
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Yes, the greater the likely hood a spec of dust would cover a data track as opposed to a guard band.
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