Every frame of an animation or picture list has a timecode associated to it.
The timecode controls the time the frame is shown during playback. MainActor VE
displays the timecode in milliseconds, therefore a timecode of 1000 would mean
that the frame would be displayed exactly one second.
Projects can have two different kinds of timecodes: Global or local timecodes.
Pictures have always a default local timecode of 1 second.
Converting projects with different timecode methods can be tricky, have a look
at the Timecode Translation .