I see Word clock out on the Omni, but no "clock in" on the Nitris. My guess is the Nitrs and Omni are "locked" together, but how. Often I see an Omni and (now legacy) Nitris in a sound suite. So afaik you need a seperate device for video and audio. I don't think there is such a thing as an Aiso supported I/O box that can receive both picture and audio from ProTools.
#Play sound through two different outputs pro
In that case, power Pro Tools guys must somehow lock their audio interface and video I/O box together. Not meaning delay, but long-term synchronization of the signals. Hence the need for devices to lock to the same clock for this to work properly.
#Play sound through two different outputs full
Over the course of a 90 minute film you could be off by a full second. 10,000 frames is about 200 seconds (depending on frame rate) so could easily be off by a frame after just three or four minutes of playback. Using typical accuracy specifications from a catalog of oscillator crystals, 50 parts per million, I computed that using two devices you could have a difference of 100/1000000 or one frame every 10,000.
While they will track together for a little while, eventually they drift apart. It’s not delay – we can usually figure that out – it’s that the clocks don’t run at the same speed. Here's what I meant, but by someone way more knowledgable: I mean, modern monitors probably cause more delay than I/O boxes, and one needs to compensate for that at the end anyway, that should be easy enough, I reckon. Perhaps that can be done in software, I don't AFAIK it is not so much a question of different delays is in the I/O paths but of the signals being clocked identically while playing. Somehow, using two different devices would require some form of slaving for reliable syncing - as far as I understand. I've seen that too often and wouldn't want it to be that way in MC.īack in the ABVB and Meridien days, Avid systems actually shipped with two separate I/O boxes, one for picture and one for sound, but they were sync locked by a cable, essentially slaving the audio box to the video box (and it worked similarly on he PT side). Which means occasionally, there can be hickups in the picture playback. The main difference is that in PT, video chases the clocked audio. I don't know whether to be unhappy at Media Composer, for not supporting multiple outputs, or Pro Tools, for not supporting audio output devices that are not AISO enabled. For Media Composer, I have a Blackmagic SDI de-embedder. To my eyes, I can't see/hear any sync issues. I use pro tools quite a bit, and have it setup to send video to my blackmagic I/O card, and audio through my computer's soundcard. I disagree that sending video to an I/O box and sending audio to a separate sound card will introduce sync issues. No get a de embedded to strip the audio off the output.
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