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Do you know a method to play three (QuickTime) videos in sync on three different machines? At least I would trigger the space bar to start them in sync.

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If the computers are near each other and you have a Bluetooth keyboard, have you tried pairing it with all of them? – user495470 Sep 8 '12 at 10:31
up vote 0 down vote accepted

Did you try Multiscreener? I have used this in the past and worked flawlessly for 3 day runs.

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I don't know how well synchronized it would be, but you could try using at (or launchd or cron) to run an osascript command at a specified time.

sudo launchctl load -w /System/Library/LaunchDaemons/
at 16:12 <<< 'osascript -e "tell app \"QuickTime Player\" to play document 1"'
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Thanks for the answer! (never heard of osascript, I will do a research) Anyway, I think that the three macs will have different loading time for loading quicktime application and the videos, so I think it will be hardly synchronize with this command.. It would be very good if I find the method just for triggering for example the space bar when videos are loaded.. I will continue my research :-) – sekmo Sep 7 '12 at 21:03
The command just tells QuickTime Player to play a video that has been opened before. You could try adding something like sleep 0.1; before it on faster computers. – user495470 Sep 8 '12 at 10:38

You could use VLC to push the video out as a UDP Multicast stream (or on HTTP). You can then receive the stream on all machines.

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