Re: [MLUG] video compression

["Mark Rages" <EMAIL:PROTECTED>]

On Jan 7, 2008 2:15 PM, Pottinger, Hardy J. <EMAIL:PROTECTED> wrote:
> Mike, unless the cost of tapes is prohibitive, you should plan on
> keeping them, regardless of your *other* backup decisions. Those tapes
> are your original source materials, anything you do to read off of them
> is creating a derivative (i.e. lower quality copy). Stored correctly,
> your sources can function as an additional backup. AND, more
> importantly, you'll never get any better quality than the source
> material. So if a better codex comes along, you'll be able to take
> advantage of it. Finally, re-using tape will put future recordings at
> risk--tape is inherently fragile, the more you use it, the less reliable
> it will become.
>

Derivative copies of digital content (such as DV tape) are equal to
the originals.

I would not count on the tape for long-term storage. It's probably
good to keep it around, but a migration plan is the only way to
archive large amounts of digital data.  Those little tapes are
physically fragile.  Consider how badly 15-20 year old VHS home movies
are faring.

The DV codec is an interesting product of its time.  It is designed to
gracefully degrade in the presence of dropouts.  ( Modern formats, by
contrast, separate completely the compression (redundancy removal) and
media formatting (redundancy addition).  DV integrates the two is a
way that made real-time compression possible in the early 90s. ) So
you should capture as soon as possible after recording the tape, so
you capture the fewest dropouts.

Regards,
Mark
EMAIL:PROTECTED
-- 
Mark Rages, Engineer
Midwest Telecine LLC
EMAIL:PROTECTED

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