MULTITRACKWRITE provides a list of records by media type and processes the data by using the pointers in the write record table to locate the data in the buffers and write the data to the file.
If the MULTITRACKWRITE_MERGE bit flag is not set, MULTITRACKWRITE writes all of the records sequentially from the first entry in the track map table (for the first track) followed by all records for the second track.
If the MULTITRACKWRITE_MERGE bit flag is set, MULTITRACKWRITE attempts to interleave the digitalvideo track with the digitalaudio track. Interleaving is accomplished based on the size of the audio buffer. For example, if a 4KB audio buffer represents one-third of a second and the frame rate is 15 frames per second, the interleave factor would be 5:1 (5 video frames to 1 audio chunk).