Apple QuickTime Guide de l'utilisateur télécharger pdf (Page 38)

38 Chapter 4 Advanced Concepts

To export a movie:

1 In QuickTime Player, open the movie you wish to export.

2 Choose File > Export.

3 Choose a format from the Export pop-up menu.

4 To adjust compression settings, click Options.

Setting the Frame Rate for Export

With QuickTime Pro, you can set the frame rate when you export a movie. Movies

with higher frame rates show motion better but have larger file sizes.

To set the frame rate for export:

1 In QuickTime Player, choose File > Export.

2 Choose “Movie to QuickTime Movie” from the Export pop-up menu.

3 Click Options and then click the Settings button in the Video box.

4 Enter a number in the “Frames per second” box or choose a rate from the pop-up

menu.

Typical frame rates are 29.97 for NTSC video, 25 for PAL video, and 24 for film. When

exporting low-bandwidth versions, select a frame rate that is 1/2, 1/3, or 1/4 of the

original frame rate. Setting a frame rate higher than the original frame rate makes

the file larger but does not improve the quality.

To see the current frame rate for a movie while it is playing, choose Window > Show

Movie Info and click the More Info triangle.

Changing a Movie’s Preview and Poster Frame

When you open a movie file from within a QuickTime-aware application such as

QuickTime Player, a preview of the movie appears in the Open dialog. The preview,

by default, shows the first 10 seconds of the movie.

To specify a new preview:

1 Select the portion of the movie that you want to use as a preview, then choose

Movie > Get Movie Properties.

2 Choose Preview from the right pop-up menu, then click “Set Preview to Selection.”

A “poster frame” is a still image of a movie that appears, for example, in the QuickTime

Player Favorites window. The default poster frame is the first frame in the movie. If you

have QuickTime Pro, you can change the poster frame by moving to the desired frame

and choosing Movie > Set Poster Frame.

For audio-only movies, changing the poster frame has no visible effect on the preview

displayed.

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Apple QuickTime Guide de l'utilisateur Page 38