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December 18th, 2005, 04:35 PM | #16 |
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Ltc/vitc
There is still a major distinction in that LTC is an audio bandwidth signal separate from the video signal and which, therefore, requires a separate channel for capture, processing etc. VITC is embedded in the video signal and so where it is employed no separate T/C connection is required. A secondary difference is that LTC persists troughout the frame and as it is a BPSK signal I'm guessing that the recovered carrier gives a continuous reference which can be used for rough sync (I'm pretty sure that systems which derive audio word clock from just LTC work this way).
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December 20th, 2005, 05:24 AM | #17 | |
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I don't want to put words in Roy's mouth but I got the impression he thought that setting the timecode to be recorded to audio or video to drop or non-drop, 30 or 29.97 or 24 or 23.976 fps would somehow affect the recording process itself and that when using double system sound, having the camera recording code at 23.976 fps but the audio recording it at 29.97 fps would make difficult or impossible to achieve or maintain sync. It's going to an inconvenience to find matching frames when the numbers on the video frame are showing, say, 01:23:45;12 while the numbers recorded with the audio matching that frame are 01:23:45;15 but hardly something to lose sleep over <grin>. Roy gives the impression he thinks that when you drop a video clip with timecode into an NLE and then drop an audio file in alongside it that has the same timecode, they can automatically sync up, shifting and stretching or contracting the audio file so the the timecode numbers for each frame recorded by the audio recorder will align themselves to matching frame number recorded in the video - am I correct in reading your questions that way Roy? I'm not aware of any NLE's that do that but I admit I'm not familiar with Avid, FCP or amy number of others. As an aside, the combo of a Canon XLH1 camera and a Sound Devices 744T recorder looks like it would be a dyn-o-mite package for shooting double system. And I imagine if you can derive TC from the LANC connector on an XL2 the two would be a good match as well. The 744's timecode module is by the Ambient folks, basically a Lockit box mounted in the recorder, and they claim an accuracy of <0.2ppm. It can serve as either a master or a slave. When syncing to external code but with the camera and recorder set to different frame rates the Ambient and SD folks say in their manual that the recorded code jams at each full second.
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December 21st, 2005, 12:32 PM | #18 | |||
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Now say you use 23.976 TC for both your cameras and the audio recorder on the set. The audio recorder records to timestamped BWF-files (with embedded TC start position for each take). Fom what I've gathered so far the video location TC is shown by the NLE in a window. Here's the idea: if the NLE can read the video TC, it could automatically move all the BWF-files I'm importing into it straight to their correct postion in relation to the video.. (making syncing your dailies very easy) Quote:
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December 21st, 2005, 02:25 PM | #19 | |
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December 22nd, 2005, 05:22 AM | #20 | |
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Syncing double system audio in post
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Anyone know of NLEs that can do this? |
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December 22nd, 2005, 09:18 AM | #21 | |
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December 23rd, 2005, 01:44 AM | #22 | |
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