Apple Compressor 2 - Manual (Page 118)

118 Chapter 9 Creating MPEG-1 Output Files
Video Tab
You use the Video tab to make settings related to the video format.
 Enabled checkbox: Make sure this box is selected if you want the MPEG-1 output
format to include the Video tab settings.
 “Frame rate” pop-up menu: Choose the frame rate of the video you are encoding.
 With Purpose set to Web, the choices are 23.976, 25 (PAL frame rate), 29.97 (NTSC
frame rate), and Automatic.
 With Purpose set to DVD, the choices are 25 (PAL frame rate), 29.97 (NTSC frame
rate), and Automatic.
Choosing Automatic forces the encoder to determine the proper frame rate by
choosing the 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 do not match the intended video frame rate. For example, a
source frame rate of 15 fps with the Purpose set to DVD results in an automatic
selection of 25 (PAL). If you are intending to use the output on an NTSC DVD, you
must choose 29.97 as the frame rate.
 Purpose buttons: Choose the intended purpose for the output files.
 Web: Forces the resolution to 320 x 240 regardless of the “Frame rate” selection.
 DVD: Allows the “Frame rate” selection to set the resolution. With the 29.97 frame
rate, the resolution is 352 x 240. With the 25 frame rate, the resolution is 352 x 288.