Visual Circuits H-DVP, User Manual

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Appendix
52
Visual Basic Call
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Remarks
A delay should be introduced between the call to mpgLoad and
mpgPlay in order to allow the driver memory buffers to be filled
from the hard drive. This delay depends on the number of channels
playing and the speed of the hard drive. If the file is played to
quickly, starvation artifacts may result.
The InitOnOpen driver parameter effects the behavior of the
mpgLoad function. If initonopen is set to 0, the last frame of the
previous file played will remain on the output. If initonopen is 1,
the video out will go black and video sync will be lost. If
initonopen=2 the output will go black but video sync will not be
lost (4ReelTime RGB with RT daughterboard only.)
This function also will detect the audio and video PIDs used by the
file, as well as the audio type. If you would like to overwrite the
PIDs set automatically, you must use the mpgSetAudioPID or
mpgSetVideoPID functions.
mpgSetInitOnOpen
The mpgSetInitOnOpenl function allows the user to control some
behavior of the driver when a new file is loaded.
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Parameters
Val
1 to set initialization upon file loading.
0 to not set initialization upon file loading.