Moving and Resizing Sources
Any source in the timeline can be moved or resized easily. In addition to dragging sources (used for shuffling sources), they can also be moved and resized within in the same track. The duration of the sources can be changed as well.
Moving Sources
In addition to dragging sources, to move a source to a different location on the same track, simply select it with the mouse and drag it to the desired location. You can also select the source and move it by tapping the Right or Left arrow keys. Keep the Shift key pressed while using Right and Left if you want the movement to be slower.
Multiple sources (even on multiple tracks) can be moved in one operation. This is very important when the alignment of the video and audio streams of the same media file is to be maintained while moving them. Multi select the sources to move by pressing the Ctrl key while clicking them, and move the sources together, either by dragging or using the Right and Left arrow keys.
Resizing Sources
To resize a source, use the mouse to grab the triangle at the top right hand corner of the clip and drag. This will change the duration of the source. Whenever you resize a media clip, the speed at which the video or audio is played changes.
For example, if an audio clip is 10 seconds long and contains 20 beats of the drum, 2 beats will be audible every second. If you change the duration of this clip to 5 seconds by dragging it, you will hear 4 beats in a second. Technically this is called as a pitch shift.
If the duration of a video file is reduced, it will play faster than normal and if the duration is increased, it will appear to play in slow motion.
Thus, resizing sources drastically is not a good idea. However, it is an easy way of changing the speed of the media that is being played in that clip.
You may select multiple sources and resize them together. This helps when video and audio belonging to the same file needs to be resized.
Restoring a Source to its original size
If you have resized the source and do not like the effect, you may restore it back to its original size (duration). Just select the media clip and choose Edit > Restore Size.
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