Pal and Double Pal in Same Project

Peter Riding wrote on 2/15/2011, 4:15 AM
This question might equally apply to NTSC and double NTSC but I am in a PAL region.

I'm using Vegas Pro 10c.

I have files from the Canon 5DII and the Panasonic TM700 and TM900. All European versions.

The files from the 5DII are AVCHD 1080p 25fps. The files from both the Panasonics are AVCHD 1080p 50fps.

When I start a new project and use the icon click through the 5DII files are identified correctly as 1080p 25fps PAL. When I start new project with the Panasonic files they are identified as 1080p 50fps DOUBLE PAL.

I now want to combine files from all the cameras into one project (there are 4 cams in all including 2 x 5DII's). Sometimes the clips are events in the same track, otherwise they are on separate tracks prior to multi-camera editing of the same subject.

Whether I start the project as a 25fps or a 50fps I'm not seeing any difference in the playback. It doesn't seem to matter which I select. Nor does Switches > Disable Resample appear to make a difference.

Can anyone explain what I should be looking for, if anything, and whether there is an advantage in choosing one over the other? I should add that the indoor shutter speed is normally 1/50th for all the cameras to avoid lights strobing (would be 1/60th in USA obviously), and its files shot indoors that I am reviewing.

Output would normally be PAL DVD standard definition plus a high def web version.

I have a feeling I'm going to feel pretty stupid once I know the answer. Thanks!



farss wrote on 2/15/2011, 6:03 AM
Put it all onto a 50i timeline and render it out to a 50i DVDA template.

The 25p will become what is technically 25PsF50 and the 50p will become 50i. Motion will look different, nothing that can easily be done about that as the underlying temporal resolution is different. Depending on the subject few to none will notice.
Problems with "stobing" will or will not happen no matter what you do.

TheHappyFriar wrote on 2/15/2011, 6:22 AM
If you make a 50p project the 25p file should stutter somewhat. But, if you're not displaying more then 25p max for some reason then you won't notice.

If you make a 25p project the 50p file will drop every other frame by default & it will look the same as the 25p (in most cases).

I'd suggest rendering out a HD file @ 50p & 25p to see the difference. Could be it's to small of a difference to see in the preview window.