Playblasting shots in the Camera Sequencer creates a movie clip of the shot’s camera over the entire shot range. By default, the movie is automatically posted to an image plane on the shot’s camera.
Clips do not follow shots. If you move a shot in time, its clip becomes unsynchronized and you must re-playblast the shot to synchronize the clip with what you see in the viewport. See also Movie Clip Indicators.
By default, playblasted movies are saved to your Movie project location. (This is set in the Edit Projects dialog box. See File > Project > Edit Current.) If there are multiple directories set in the Movie project location, Maya uses the first location listed. You can also change the Directory in the Playblast Shot Options or Playblast Sequence Options to change where movie files are saved.
Instead of just using the list connections (Maya 2012 and below):
string $fps[] = `listConnections ($shot + ".clip")`;
You must add the –shapes flag so that the imagePlaneShape node appears in the list.
string $fps[] = `listConnections -shapes 1 ($shot + ".clip")`;
The shot is rendered out to a clip. A movie indicator appears at the bottom of the shot.
To playblast all shots in a track
All shots are rendered into a single movie. Whether an individual shot contributes to the movie depends on how the shots overlap each other.
The output movie is not associated with any particular shot and is not attached to the image plane for any camera.