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mixing 25i and 50p footage - cannot sync them.

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Stewart Bourke
mixing 25i and 50p footage - cannot sync them.
on Jun 7, 2015 at 3:39:05 pm

VP12, tring to mix 50p from Canon hg30 (pal) and footage from sony scr hc1000 25i.

I have been asked to make a dvd from two sets of footage I have been given. A show was shot using two cameras - the wide being the canon - HG30 which was set for 50p, and the sony DV camera was delivered in 25i for the close-ups. I know there will be a lot of quality wasted from the canon.

My problem is that I cannot sync the two sets of video on the timeline. If I line up the video on two tracks, very quickly they start to go out of sync. I think it may be down to the 50p vs 25i.

I set the project properties to the PAL DVD widescreen template as that is wheat I will be rendering. I tried disabling smart-re-sample on the various events.

Given that fact that the canon is 50p, is there a way to tell it to 'resample' down to the 25 frames, or do I need to render it into an intermediary first? I did try rendering a region at 25 fps, but it did not make any difference.

Would anybody have any suggestions on how to sync the t?racks

Thanks

STBO.


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Bob Peterson
Re: mixing 25i and 50p footage - cannot sync them.
on Jun 7, 2015 at 7:43:52 pm

Try disabling resample. That may give you what you want which is 25i.


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John Rofrano
Re: mixing 25i and 50p footage - cannot sync them.
on Jun 11, 2015 at 3:06:43 am

It may have more to do with using two cameras made from two different manufacturers one SD, one HD, with two different clock crystals of varying quality that aren't synchronized in any way. Usually they will stay in sync for around 10 minutes but if one clock crystal runs a little fast and the other runs a little slow the difference can be greater and they can go out of sync quicker. The solution is to cut one video and move it back in sync or try and stretch one video to match the other more closely. The only way to get two cameras in perfect sync is to use GenLock with an external World Clock.

~jr

http://www.johnrofrano.com
http://www.vasst.com



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Stewart Bourke
Re: mixing 25i and 50p footage - cannot sync them.
on Jun 12, 2015 at 7:43:10 am

@Bob - thanks for the suggestion. I had tried that but it did not make a difference.

@JR - I think that you are correct - going out of sync over time was certainly an issue. Because of the cuts I was able to do as you suggested

Thanks for the input.


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John Rofrano
Re: mixing 25i and 50p footage - cannot sync them.
on Jun 12, 2015 at 11:17:19 am

Glad that worked for you. This is very common. Luckily Vegas Pro makes it very easy to retime video and audio.

~jr

http://www.johnrofrano.com
http://www.vasst.com



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