Apple Final Cut Pro HD (4.5): New Features - Manual (Page 44)

44 Chapter 1 Using DVCPRO HD
Determining Scratch Disk Requirements for DVCPRO HD
Before capturing video and audio, make sure your hard disks have sufficient capacity
for your source footage plus some additional space for video and audio rendering. The
table below compares the on-tape data rates for DVCPRO HD formats. The actual disk
space used during capture will vary slightly depending on the number of audio
channels captured.
Because DVCPRO HD is compressed, an internal 7200RPM ATA drive or serial ATA drive
(used in computers with G5 processors) is sufficient for capturing DVCPRO HD.
In some cases FireWire drives can be effectively used to capture and edit DVCPRO HD
video. However, some FireWire drives lack the performance of internal Ultra ATA drives,
or of internal or external SCSI drives, and for this reason are not always recommended.
If you choose to use a FireWire drive, you should ensure that:
• The FireWire drive is the only FireWire device on the bus.
• The hard drive rotational speed is at least 7200 RPM.
• The hard drive can sustain minimum data rates appropriate for your video format.
• The hard drive uses a modern high-performance bridge chip such as the Oxford 911
or 922.
• The hard drive uses its own power supply.
Choosing a DVCPRO HD Easy Setup
Final Cut Pro comes with several DVCPRO HD Easy Setups. Choose the Easy Setup that
matches your source footage on tape and your output format (assuming they are the
same). If your source footage and output format are different, it’s usually best to choose
an Easy Setup that matches your source footage and convert your final movie to the
output format when editing is complete.
If you need to create a custom Easy Setup, see “Working With Easy Setups, Presets, and
the A/V Devices Tab” in the Final Cut Pro 4 User’s Manual.
Format Bits per second Bytes per second
1080i60, 720p60 100 Mbps 11.75 MB/sec.
720p30 50 Mbps 6.25 MB/sec.
720p24 40 Mbps 5 MB/sec.
UP01022.Book Page 44 Tuesday, March 23, 2004 7:32 PM