I recently added a GoPro Hero3 Black camera to my cameras. I own a Canon XLH1a. Until today a always recorded in HDV 1440*1080 50i. The Hero3 captures in HD 1920*1080 30p.
I always edited in HDV but now i have to mix the two together.
What is the best I can do?
With the XLH1a i have the possibility to also record progressive. Normally I use interlaced because i think it is more dynamic and works better for slowmotion. But it's 25p and not 30p like the Hero3. (I will probaply also use the 60fps/120fps function).
Otherwise is the problem with the resolution. I have imported 1440 footage in vegas while the properties are set to 1920 in stead of 1440. But it seems not to change, not streched or cropped? How is that possible?
Thanks for the help!

What is the best I can do?

You have one NTSC camera and one PAL camera. There is almost no reasonable way to mix 30p with 50i. Assuming the electric grid in your country uses is 50hz AC, what you need is a GoPro with 25p and 50p shooting modes?

Although Eric is right, Vegas does a reasonable job mixing 30 fs and 25 fps - if you render to 25 fps it just drops every seventh frame from the 30fps and if you're lucky you don't notice. Basically, setting the project properties to the same scale as your footage is just a convenience for getting the same preview on your edit - you can set the project properties to anything you like and put any kind of footage on your timeline, only thing you'd really notice is aspect ration, e.g. if it's 3:4 or 16:9. But unless you've got a really powerful machine you might want to transcode the GoPro footage first.

Sorry - that's "every sixth frame". And don't forget to disable resampling.

Thanx for the answers. So if i'm correct, i should better start recoding with the xlh1 in 25p in stead of 50i?

And for my other question, i didn't tought of the pixelaspectratio :). 1 for the gopro and 1.33 for the xlh1 results in the same resolution.

Thanx for the answers. So if i'm correct, i should better start recoding with the xlh1 in 25p in stead of 50i?

And for my other question, i didn't tought of the pixelaspectratio :). 1 for the gopro and 1.33 for the xlh1 results in the same resolution.

You are correct about the pixel aspect ratios. If you are converting 30p to either 50i or 25p be careful because any camara pan of the GoPro may judder in a rather unacceptible way.