Apple Compressor (4.0) - Manual (Page 113)

Chapter 5 Custom settings and output formats 113
Video tab
You use the Video tab to make settings related to the video format.
Automatic button
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Enabled: Make sure this checkbox is selected if you want the MPEG-1 output format to include
the Video tab settings.
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Frame Rate: Choose the frame rate of the video you’re encoding. The Purpose buttons (Web
and DVD) modify the options available in this pop-up menu:
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With Purpose set to Web: The Frame Rate choices are 23.976, 25 (PAL frame rate), 29.97 (NTSC
frame rate), and Automatic.
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With Purpose set to DVD: The Frame Rate choices are 25 (PAL frame rate), 29.97 (NTSC frame
rate), and Automatic.
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Automatic button: Clicking the Automatic button forces the encoder to choose the frame rate
that most closely matches the source frame rate.
Note: Using the Automatic setting with nonstandard source frame rates may result in output
frame rates that don’t match the intended video frame rate. For example, a source frame rate
of 15 fps with Purpose set to DVD results in an automatic selection of 25 (PAL). If you intend to
use the output on an NTSC DVD, you must choose 29.97 as the frame rate.
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Purpose: Select the intended purpose for the output files.
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Web: Forces the resolution to 320 x 240 regardless of the Frame Rate setting.
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DVD: Allows the Frame Rate setting to determine the resolution. With the 29.97 fps frame
rate, the resolution is 352 x 240. With the 25 fps frame rate, the resolution is 352 x 288.
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Bit Rate: Use this slider to set the bit rate to use for the output video, or enter a number in the
field. Although the available range is from 0.5 Mbps to 2.0 Mbps, the actual setting you should
use depends on how the output is to be used. Higher bit rates produce better picture quality,
but they also produce larger output files.
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For web projects: Choose a bit rate that best balances the picture quality with file size and
download expectations.
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For VCD projects: The recommended video bit rate is 1.15 Mbps, with a system stream
(multiplexed video and audio in the same file) bit rate of under 1.3944 Mbps.
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For DVD projects: The typical video bit rate is 1.15 Mbps, with 1.856 Mbps being the
maximum allowed.