OSC and infinite loops
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simon.c...@gmail.com
Oct 3, 2023, 9:11:17 AM10/3/23
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Hi team. I have an installation where (due to things out of my control) audio is played off one machine and the video which needs to be in sync is played off another one. LTC or MTC is off the cards. My questions is, is there a way for the audio machine to send out an OSC message each time the audio is looped if it is set to infinite loop? Any other suggestions of neat ways for them to both stay in sync? I also realise that the video should be set to "hard stop and restart" on a second trigger, but that will result in a frame of black each loop...
micpool
Oct 3, 2023, 11:24:51 AM10/3/23
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There can be no guarantee (or expectation) that these will remain in sync without using QLab 5 and Timecode, as the timebase for the audio track will be derived from the audio device clock and the video won't.
What I don't understand is that by saying MTC is off the cards and implying that the video can't send its soundtrack to the audio inputs of the installation, you seem to be saying that one of the machines is completely electrically isolated from the other. If this is the case how are you sending OSC between the machines? If copper or wireless transmissions can breach the barrier, then they can carry audio or timecode.
If however there is some strange force field which means any reasonable engineering solution is off the table, then you will need to unloop and follow on from the end of the audio to start cues for the audio and video so they are at least close to sync at the beginning if the cue. As you can't predict whether the video willl be behind or ahead of the audio at the end, you will have to set hard stop and restart, on the videocue on the remote machine when it receives a second trigger To try and avoid any missing video the best thing to do is to run the last frame of the video on a lower layer so that when the video stops and restarts it shows this content.
Mic
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