Grass Valley Profile XP Aug 16 2004 - Manual (Page 133)

Selecting video quality and crosspoints
23 July 2004 Profile XP System Guide 133
6. Click the Browse Video check box if you want to add MPEG-1 proxy video to the
track.
NOTE: The Browse Video option is available only in media platforms equipped
with standard definition MPEG encoder boards. Browse video is not available with
video codecs configured as MPEG encoders or with high definition MPEG
encoders.