- Determining Which Tracks a Movie Contains
- Combining Tracks with the Add and Add Scaled Commands
- Extracting Tracks
- Deleting Tracks
- Disabling and Enabling Tracks
- Scaling a Track to a Specific Duration
- Setting Up Tracks with Alternate Languages
- Specifying a Language for a Track
- Designating a Set of Alternate Tracks
- Loading Tracks into Memory
Loading Tracks into Memory
Normally, when QuickTime movies play, only small amounts of data are loaded into memory (RAM) at a time. For very small tracks, you can achieve slightly better performance by specifying that all of a track's data be put into or kept in memory.
To specify that a track be loaded into memory:
From the Movie menu, choose Get Movie Properties to open the movie's Properties window (Figure 7.25).
Figure 7.25 Choose Get Movie Properties to open the Properties window.
From the left pop-up menu, choose the track you want loaded into memory; from the right pop-up menu, choose Preload (Figure 7.26).
Figure 7.26 From the left pop-up menu, choose a track; from the right pop-up menu, choose Preload.
The Preload panel has two checkboxes (Figure 7.27).
Figure 7.27 Choose the Preload or Cache Hint option to load track data into memory.
Choose Preload if you want the track to be loaded into memory before it is played. This option is ideal for tracks containing small amounts of data, such as text and music tracks. It allows the movie to play smoothly while the system is doing other things (such as loading another movie from a CD-ROM).
Choose "Cache hint" if you want the track to stay in memory for as long as possible after it has been played.
This option is useful for small files that you want to loop. If the track is too large to remain in memory, however, it will perform poorly.
Use these preloading options only for tracks that contain small amounts of data. Crashes or other unpredictable behavior may occur if QuickTime tries to load large amounts of data into memory.