Video Master file format: (VID,FLM & VSQ)
                   -----------------------------------------


     Header (32 bytes)
     size    name            Description
     ----------------------------------------------------------------------
     long    header          Contains 'VMAS'
     word    version         Contains '1x' for version 1.x
     word    no_frames       No. of frames of video...
     word    frame_rate      Playback rate of video (see table)
     long    sample_size     Amount of audio in file... (0=no audio - VID)
     word    sample_rate     Sample playback rate (Hz)
     word    seq_length      Size of sequence data...  (0=no seq - FLM)
     word    no_keys         How many keys there are...
     .
     .
     .
     Padded to 32 bytes


     Video frames
     ------------
     16 words of palette, 1 word for each colour 0 to 15
     (the palette data is in the AMIGA format... xxxxrrrr/ggggbbbb).
     8000 bytes of picture per frame, no. of frames in header.

     Audio data
     ----------
     8 bit signed samples, size of sample in header.

     Sequence data
     -------------
     No. of bytes given in the header. Each byte represents 1/10s interval.
     0 = no event, 128+key = event

     Key data
     --------
     No. of keys as given in the header, each key definition contains the
     following:

     word    start_frame     First video frame for this key
     word    last_frame      Last video frame for this key
     word    video_speed     Speed of video for this key (see table)
     long    audio_start     Offset to start of audio for this key
     long    audio_length    Length of audio for this key
     word    audio_rate      Sample speed of this key (Hz) 0=audio off
     byte    video_loop      Flag - loop video
     byte    audio_loop      Flag - loop audio



     Speed of video playback
     -----------------------
     Value   PAL     NTSC    Units
     -------------------------------------
     0       25      30      frames/second
     1       12      15      frames/second
     2       8       10      frames/second
     3       6       7       frames/second
     4       4       5       frames/second
     5       3       3       frames/second
     6       2       2       frames/second
     7       1       1       frame/second
     8       2       2       seconds/frame
     9       3       3       seconds/frame
     10      4       4       seconds/frame
     11      5       5       seconds/frame
     12      6       6       seconds/frame
     13      7       7       seconds/frame
     14      8       8       seconds/frame
     15      9       9       seconds/frame