Dual Roller Trimming and Sync

[Jon Zanone]

I’m not sure I would call this ‘breaking synch’. Maybe just call it an L-cut.

If you perform an L-cut with the same media (say you subclip your shots from a single piece of media), you’ll have ‘out-of-synch’ numbers all over the place, IF you use the audio from the same clip. If you digitize each individual clip, OR you are cutting say a music video, you won’t have ‘out-of-synch’ numbers show up. The audio and the video have to be associated with one another (or digitized together) for Avid to call the audio and video ‘out-of-synch’ with one another.

I hope this helps – post back if it doesn’t!

Jon

“So you want to throw out the old you – but the old you is old enough to know it won’t make it better”
Del Amitri – “Make it Better”

[Jonathan Byrd]

It’s hard for me to explain what I’m talking about. Let me try again and thanks for your reply by the way.

What I’m talking about came up while I was teaching L-cuts. I teach the students that if you use dual roller trim that you will NOT break sync in your timeline.

Now, that being said, if you create an L-cut and you have a source of video over a different source of audio your sequence CAN become “out of sync” if you’re not careful although, as you said, Avid will not “warn” you of that because it only gives you the white numbers when the audio and video from the SAME SOURCE is off.

So what I’m basically wondering is what exactly is Avid’s defintion of sync as it relates to the timeline? Because I’m taught that using dual roller will not break it, however I can make my audio and video clips not match by using dual roller.

I’d just like to be able to tell my students what I’m referring to when I say they can’t break sync when using dual roller trim. Hopefully that makes more sense. It’s hard to put all this into writing. Thanks again.

[Jon Zanone]

My interpretation of Avid’s definition (based on working with various systems over the years, not any academic knowledge)of synch is any clip containing audio and video, sharing the same TC, tape name, digitize date and time, plus a number of other factors. Relating synch to the time line is a little different – the timeline is very fluid and is’nt necessarliy synched to anything, except itself. And that can be a matter of judgement (maybe your students like the Chinese film overdub method of synch…) Using dual rollers will not affect synch down the line as much as it will affect synch in the immediate area, especially when crossing an audio cut.

To make this clear, you’d probably need to demonstrate left / right side trimming as well. Pulling one side of the clip will definitely affect synch of the whole timeline.

I hope I said what I meant to say, instead of not saying what you hoped I’d say….

Jon

“So you want to throw out the old you – but the old you is old enough to know it won’t make it better”
Del Amitri – “Make it Better”

[Jeff Greenberg]

It’s not out of sync. Sync only exists with Video and audio that came from the same tape.

Instead, do a single roller trim of video only. Since you’re making video longer (and every shot after is pushed down), it’ll throw every clip after out of sync.

Also, I always use pieces of film to teach this. Not Paper towel rolls, not toilet paper, but actual film.

Best,

Jeff G
Principal Instructor
Future Media Concepts

FMCTraining.com
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