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Old August 1st, 2008, 09:32 AM   #1
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gen loss in dv to dv?

Hi! This might be the most basic of questions but it would be nice if I get an answer once and for all. Do I lose a generation if I render the edited DV AVI clips on my timeline to make a single DV AVI file? How many times can I do this before I start seeing any distortion or artifacts? Naturally I won't be adding any effects or such and will always be staying in the exact format that the original footage is in.
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Old August 1st, 2008, 01:39 PM   #2
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No generational loss in DV

In theory, there should be no generational loss going from DV to DV.

In analog, you are transferring actual visual information from tape to tape. The "D" in DV is for digital, which means you are transferring the description of the visual information in 0's and 1's. Since the digital/numeric description is always the same, the signals should be identical.
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Old August 1st, 2008, 03:15 PM   #3
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As long as the video is in the form of files on your computer, there won't be any loss (although any metadata such as recording time, date etc are usually replaced with null information).

If you send the video to and fro from the PC to a DV deck/camcorder, eventually you will get losses though it will take quite a few iterations. The recording of DV to tape is not as perfect as you may be led to believe. The DV specification permits a certain level of error and quite a lot of the information written to tape is for error correction and concealment. Correction allows perfect restoration of damaged information - a lot of this on the tape is for audio. Concealment provides a way to hide damaged information - the video part has a simple but effective concealment scheme. Even a first generation DV-to-DV copy will not be bit perfect but you will be unlikely to tell where the differences are without a rigorous bit-for-bit comparison. This applies to tape. For other storage media, copying is bit-for-bit perfect.
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