Question: In a 3GP file conforming to the Adaptive-Streaming profile, how are movie data and track samples organized?
Option 1: Movie data is contained in the 'moov' box with samples in the 'stts', 'stsc', and 'stco' boxes.
Option 2: All movie data is in Movie Fragments; the 'moov' box's tracks have no samples (entry_count set to 0).
Option 3: The 'mdat' box contains all movie data, with the 'moov' box only holding track metadata.
Option 4: Samples are distributed across both Movie Fragments and the 'moov' box's tracks.
Explanation: According to the Adaptive-Streaming profile constraints for 3GP files, all movie data must be contained in Movie Fragments. This implies that the tracks within the 'moov' box should not contain any samples, which is achieved by setting the entry_count in related boxes to 0, facilitating efficient adaptive streaming.