Apple Motion 2 - Manual (Page 945)

Appendix B Video and File Formats 945
Standard definition DV formats include DV, DVCAM, DVCPRO25, and DVCPRO50.
High Definition Video
All high definition formats use a nonanamorphic, 16:9 aspect ratio using square pixels,
just like a computer display. Despite these similarities, there are many high definition
video formats.
The different frame sizes, frame rates, and scanning methods serve different markets,
both domestically and internationally. For example, the availability of the 720p format
is a result of needing a lower resolution format, so that current standard definition
programming can be blown up more easily. It is also seen as a format suitable for
programming that would not benefit from additional resolution, such as local news. For
broadcast, bandwidth is a critical issue, and the larger resolution of 1080 video takes up
valuable room on the broadcasting spectrum as well as on the available bandwidth of
cable and satellite services.
As you can see in the previous table, each high definition standard supports numerous
frame rates. These can be divided into two categories:
• Frame rates for film production and post-production
• Frame rates for broadcast video applications
Digital format Maker
Color
sampling Compression
ratio Compression
type Recorded
bit rate
DV Sony 4:1:1 5:1 DV 3.6 MB/sec.
DVCAM Sony 4:1:1 5:1 DV 3.6 MB/sec.
DVCPRO25 Panasonic 4:1:1 (NTSC)
4:2:0 (PAL)
5:1 DV 3.6 MB/sec.
DVCPRO50 Panasonic 4:2:2 3.3:1 DV 7 MB/sec.
Standard Frame size Frame rates Scanning method
720p 1280 x 720 23.98, 24, 25, 29.97,
59.94, 60 Progressive
1080p 1920 x 1080 23.98, 24, 25, 29.97,
59.94, 60 Progressive
1080i 1920 x 1080 25, 29.97, 59.94, 60 Interlaced
01112.book Page 945 Sunday, March 13, 2005 10:36 PM