Can you say something about the question of whether M-JPEG supports a soundtrack? It's not clear from the specs if it does.
M-JPEG the codec format only has to do with video. Common file formats that wrap M-JPEG compressed video frames like AVI or QuickTime do have audio streams too.
A MPEG video stream is video only, although a MPEG system stream (what we think of as a MPEG file) is a combination of the MPEG video stream and audio streams.
DV format actually intertwines video and audio pretty tightly. Native DV format is actually the format used to write blocks on a DV tape, which is why things are so intertwined. It's common for editing programs to extract out the audio part and put it in a separate stream, either as a pre-edit step or else while transferring the DV data into a platform local wrapping file format, like AVI or QuickTime.
- Jan