ATI Technologies 137-40188-60 - Manual (Page 43)

Using Your ATI Multimedia Center 43
Video
Format
IBP
Frames
(Mbps) Minimum
CPU
Required I-Frame
Only
(Mbps) Minimum
CPU
Required
160x120 1.0 P200-MMX 1.0 P200-MMX
352x240 1.5 PII-266 2.0 P200-MMX
320x480 3.0 PII-400 4.0 PII-266
640x480 4.0 Athlon 600 6.0 PIII-450
720x480 4.0 Athlon 700 6.0 PIII-450
Mbps = Megabits per second, or millions of bits per second.
1 Mbps is approximately 125Kbytes/second.
• The motion estimation slider can be used to control the quality of the
video – a high setting (75 or more) uses more CPU, but provides better
quality video. A low setting (25 or less) speeds up encoding, but
produces lower quality video at a given bit-rate.
• The above bit-rate settings are based on a motion estimation setting of
10.
• If your system is not capable of achieving smooth-looking video at 29.97,
try the following:
• Capture I frames only.
• Capture using a smaller frame size.
• Capture video only, with no audio.
MPEG-1 decoders are widely used, so video encoded in MPEG-1 format
can be played on many PCs. However, MPEG-1 playback on a PC uses the
Microsoft MPEG-1 decoder, which may not provide the best performance.
MPEG-2 playback on a PC requires an MPEG-2 decoder. With ATI graphics
cards, MPEG-2 decoders use the ATI hardware IDCT and motion
compensation, which provides higher resolution video playback and less
CPU loading than the Microsoft MPEG-1 decoder.