Video Master Film
From Just Solve the File Format Problem
Video Master Film is an animated graphics format associated with Atari ST computers.
Format Specification
Video Master file format: (VID,FLM & VSQ)
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Header (32 bytes)
size name Description
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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...
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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
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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
