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From: garl@nlm-mcs.arpa (Gary Letourneau)
Newsgroups: comp.sys.mac.hypercard
Subject: playVideo videodisc command
Message-ID: <9487@nlm-mcs.arpa>
Date: 14 May 89 01:03:29 GMT
Sender: root@nlm-mcs.arpa
Organization: NLM/LHNCBC, Bethesda, Md.
Lines: 26


I have a question concerning the video command playVideo. 
A typical call of playVideo is:

    playVideo here, stopFrame 

where here < stopFrame. This works fine. However, if I try the 
same command with stopFrame < here (in order to play backwards),
it just plays forward. Why did it not play backwards? Is the 
keyword 'here' only allowed for playing forward? 

How can I play backwards from the current frame? I tried the
following:

    playVideo videoframe(), startFrame

This worked, but it did not give a smooth motion.

Again how I play backwards from the current frame? By the way, 
I am using user XCMD version 2.2d9, and serial port XCMD version 
2.5d1. Unfortunately, at the time I am writing this message, I do 
not have available the version number of the videodisc driver 
for a Pioneer 4200 that I am using.

                                 Gary Letourneau
                                 letourneau@mcs.nlm.nih.gov