Pyro Industries API-1394PCI Instrukcja Użytkownika Pobierz pdf (Strona 47)

CHAPTER 2: CAPTURING ■

When using Free DV or Xpress Pro, it’s highly recommended that you store

media on a separate drive. In other words, do not store your captured media on the

system drive where your operating system (OS), applications, and other materials are

stored. There are a few good reasons for this.

When you press the Play button on your Free DV/Xpress Pro system, it gives a

command to the clip in the database, which finds the media database, which finds the

media and tells it to read back at the point where your blue position indicator or play-

head is located, which also reads ahead of the media for effects and other precomputes.

All this activity, known in the industry as “building the pipes,” is pushing the drive to

its limits. If you have other software on that same drive, chances are the drive will

“time out” and not be able to properly play back your media.

This is especially true with laptops, whose drives are usually slower than desktop

internal and external drives. Although you might be able to get away with capturing

and playing back a short sequence, it’s very likely that the drive will time out when play-

ing back a longer stream. Laptops have drives that run as slow as 4200 revolutions per

minute (rpm). By contrast, most external drives run 10,000 rpm. More revolutions

per minute means more data played in a minute and less wear on the drive, although it

could be argued that the drive is wearing out faster because it spins faster. Keeping

your media on a separate external drive also allows you to move the project to another

computer if necessary.

If you are using Xpress Pro with the optional Mojo hardware and you capture

your media at 1:1 lossless compression, it will be nearly impossible to play back any

media from the system drive.

Here is a rule of thumb that is easy to remember when capturing DV resolution:

Every five minutes of media takes up about one gigabyte of space. So if you have a

hard drive with 80 GB available, you should, in theory, be able to capture 400 minutes

of media, or 6 hours 40 minutes.

Here’s the Catch-22 on drive space: You could purchase one huge drive and save

money, but the caveat is that when the drive fails (and all drives do eventually fail),

you’ll lose a lot more media. So it’s wise to purchase just a couple of medium-size

drives. Those terabyte drives are really cool for bragging rights, but when they crash,

you’ve lost a lot of footage

In addition to the media that is captured, you’ll need more space for rendering,

which is the process of creating new media for effects and imported files. Any time an

effect is created or a file is imported, it needs to be rendered for final output. This takes

up a lot of space on the drive.

One final consideration when figuring drive space is the media database. Inside

of every media drive is a file that contains a database for the media on that specific

drive. Without this database, your Free DV/Xpress Pro system could not figure out

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Pyro Industries API-1394PCI Instrukcja Użytkownika Strona 47