Mixing 720p and 1080p files on same projecto (Sony Vegas)

Hey guys, as the title states, I am making a video where I mix little parts of videos with different frame rates (1080p, 720p, 480p, etc.) to make a new video. My question is, when you work like this, what frame rate do you use on the project settings? 1080p or 720p? Does it even matter? And what about the rendering? Should I render on 720p or 1080p? Any insights would be greatly appreciated. Thank you!!
 
Personally, I'd go with whatever the primary amount of your videos consist of. If you have more 1080p videos, render the whole thing in 1080p and vis versa. Depends on what your video is. If it's gaming, you can try to push 60fps, test it, if you don't notice a drop in smoothness going from the 1080 to 720 clips, keep it. Otherwise drop it to 30fps. My rule is as long as its HD and plays smooth, you're golden. Play around with it.
 
another thing to note is making sure "maintain aspect ratio" is off in switches (or properties) of EACH CLIP that is not the final file size's size. so for example if your project is 1080p, make sure all of your 480p and 720p clips have the aspect ratio turned off so they dont have those dreadful black bars. happy editing!
 
So, if I have some footage on 30fps, and some other footage on 60fps, and want to mix them on a same video, I should use 30fps in the render settings? Because 60fps would make double frames on the 30fps bits? Please help!!! THANKS!!
 
So, if I have some footage on 30fps, and some other footage on 60fps, and want to mix them on a same video, I should use 30fps in the render settings? Because 60fps would make double frames on the 30fps bits? Please help!!! THANKS!!
Afaik, it doesn't really matter if you render 30 FPS videos in 60FPS. they will still look 30FPS, and not double the frames or anything.
 
Vegas allows you to mix media format types on a single Timeline which is one reason I liked it so much. If it is a 30fps media clip on a 60fps project it will do its own frame interpolation. If it's 60fps on a 30fps project it will do what it needs to adapt it down to 30fps.
Just make sure that if media is interlaced that you set those clips to deinterlace. (There's also a deinterlace global project setting but I'm not sure if this affects already-progressive media.)
The resolution is all up to your preference. The frame rate should probably be 30 unless your main media is 60 and you want to render to that.
 
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