Speed – Apple Cinema Tools 3 User Manual
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Appendix A
Background Basics
205
Window Burn
As part of the telecine transfer process (described in “
page 19), the key number is typically burned in to the video (along with the video and
audio timecode), helping to identify specific frames. The burned-in numbers are called
window burn.
It is much easier to use Cinema Tools if you can see the key numbers. You can use
Cinema Tools without the window burn, but it requires more effort on your part to
ensure edits are being tracked properly.
Note: Once you have captured your video but before you start editing, check the
burned-in key numbers and timecode to make sure they match the actual ones on the
film and videotape. Any errors at this point will result in serious problems when the
negative is conformed. The most common way to verify these numbers is to have the
lab or transfer facility physically punch a hole or otherwise mark a film frame, note its
key number, and compare it to the burned-in key number when viewing the
transferred video.
Speed
Film normally has a frame rate of 24 frames per second (fps). This means a new image is
exposed or projected 24 times a second. To ease conversion to video frame rates, it is
common to run the film at rates other than 24 fps during the telecine transfer.
Cinema Tools supports film transferred to video with the telecine running at the rates
of 23.98 fps, 24 fps, 25 fps, and 29.97 fps (30 fps). See “
more frame rate information.
UP01101.Book Page 205 Thursday, March 10, 2005 3:16 PM