Apple DVD Studio Pro 4 - Manual (Page 390)

Editing Video and Audio Clips
You can trim the start and end of a clip, which is useful when you need to remove a
portion of an asset for artistic reasons (such as a bumped camera). It is important to
understand that video clips in DVD Studio Pro are trimmed based on GOP boundaries—you
cannot choose a specific frame to trim to. The typical GOP (Group of Pictures) size for
NTSC video is 15 frames—for PAL video it is 12 frames. This means you may have to
choose between trimming a little too much or not quite enough. If you need to trim a
clip precisely, you should use a video editor to make the trim, and then bring the asset
back into DVD Studio Pro.
You can trim audio clips by frames, making it possible to trim off a popping noise.
Trimming can also be a way to use a small part of a longer asset. Only the part of the
asset that is in the stream is included in the final disc size.
About the V1 Stream
The first video stream, V1, has requirements different from the other streams.
DVD Studio Pro automatically ensures these conditions are met.
• The first clip must be at the beginning of the timeline. There cannot be a gap between
the timeline’s first frame and the first frame of the V1 clip. All other streams, including
the other video streams, can have their first clip start anywhere in the timeline.
• You cannot have gaps between clips in the V1 stream. All other streams can have gaps
between their clips.
• When building the project, the track ends at the last frame of video in the V1 stream.
Any streams that have clips extending beyond the V1 clips are automatically truncated
by the build process.
Trimming and Positioning Clips
There are several methods you can use to trim and position a stream’s clips within the
Track Editor.
To trim a stream’s clip by dragging
1 Position the pointer over the end of the clip you want to trim. The pointer changes to a
bracket with an arrow pointing in the direction you can trim.
2 Drag the clip’s edge to its new position.
Note: You cannot trim a clip beyond the edges of the asset.
390 Chapter 17 Creating and Editing Tracks