Oh, thanks, i totally forget that!
With lens correction fx i cannot get the same great correction as in Insta.
So this is a feature request :)

+1 for that projection type requirement choices.

However, the more I experiment with it, let's say 'linear', I feel a bit 'uncomfortably not natural feel' due to over-wide result - and the fish eye feels more 'natural'. - but I guess this is personal preferences.

Yes, both looks strange because of very wide fov, but for normal fov 5.7k res is just not enough.

With very wide fov i can use in 4k projects too if the lighting was good!
 

From left field: Have you tried using the FFMPEG V360 filter for any of this?

FFMPEG has been a handy tool over the years in my 3D and 3D360 workflow. Lately, I've been using it for VR180 format conversions---SBS fisheye (already 3D aligned in Vegas) to SBS equilateral, 3D360 to VR180, etc.

What you mean "left field"? For linear projection? I dont tried ffmpeg with vegas.
Any tutorial?

@relaxvideo: Sorry...I meant an idea that isn't available within Vegas itself and might be considered a distraction from the main thread of discussion.

I don't know of a tutorial for that specifically, but a couple of options come to mind:

First, you could reorient the 360 so the subject of interest is centered, create the cubemap face centered on that location, and crop it to your desired frame size.

Or, you could reorient the image and convert it to a rectilinear (normal) projection, again cropping or specifying the target field of view for the final image.

I haven't tried either of these myself, though I have tinkered a little with cubemaps.

Here is a link to the ffmpeg filters documentation. Search for the v360 filter.

https://ffmpeg.org/ffmpeg-filters.html

If you haven't used it before the learning curve is daunting...I've learned by doing, referencing a book (in storage now) and lots of google searches for specific tasks.

There are a couple of GUI's available: I used myffmpeg for a while many years ago, but it was a bit limited.

 

I tinkered with the FFMPEG v360 filter back in July 2021 to get an understanding of it's cubemap functionality. Looking back I'm thinking the results may be applicable to 360 video reframing, though more cropping is likely needed either in the ffmpeg command or in Vegas.

The videos I tinkered with were created while I was playing with a new to me Rokinon/Samyang 8mm fisheye lens on a Nikon D7000 SLR, mounted on a Neewer panorama head on a tripod. I shot a still panorama using 6 shots around with 2 up and 2 down, plus several offset nadir shots to hide the tripod. I also shot 6 short videos around. I stitched the videos using Autopano Video Pro & Giga. I forget my exact workflow, but believe I used the still images in Giga to correct any issues in the apex and nadir of the video either as part of the Autopano workflow or using masking in Vegas.

The video itself was silly...me walking around the tripod with the camera in each position, counting so I spent about the same time walking through the 60 degree field of view (after stitching). I'd hoped it would look like I was walking around a stationary 360 camera, but that didn't work, eh? I made a remix where I'm walking through each view at the 8 time! Here are the two original videos:



To create a 3x2 cube map I used the following FFMPEG input:

ffmpeg -i input -vf v360=e:c3x2:cubic:out_pad=0.01 cubemap.mp4

Note: I didn't explicitly specify the codec so it defaults to libx264 and yields a 3840x1920 video (or 3840x3840 for the individual cubes below).

and the video

The image order in the upper row is Right, Left, Up.
The image order in the bottom row is Down, Foreward, Back.

Here are the FFMPEG inputs, and resulting videos for each of the individual cube faces:

ffmpeg -i input -vf v360=e:sg:d_fov=90:yaw=90:pitch=90 right.mp4 https://youtube.com/shorts/KJvLHCM-wcc

ffmpeg -i input -vf v360=e:sg:d_fov=90:yaw=-90:pitch=90 left.mp4 https://youtube.com/shorts/cNerKgIrwJs

ffmpeg -i input -vf v360=e:sg:d_fov=90:yaw=0:pitch=180 up.mp4 https://youtube.com/shorts/c3cn95uG398

ffmpeg -i input -vf v360=e:sg:d_fov=90:yaw=0 down.mp4 https://youtube.com/shorts/5rj0bJAebXs

ffmpeg -i input -vf v360=e:sg:d_fov=90:yaw=0:pitch=90 foreward.mp4 https://youtube.com/shorts/YcZBZFCczqQ

ffmpeg -i input -vf v360=e:sg:d_fov=90:yaw=180:pitch=90 back.mp4 https://youtube.com/shorts/hX3U48AkL1w

A couple of comments on the input: V360=e:sq:d_fov=90 tells it to convert an equirectangular projection to a Stereographic projection cropped to a 90 degree field of view. Yaw is horizontal rotation, pitch is rotation up and down. There is also a roll parameter but it wasn't used here.

If it isn't cropped the stereographic projection yields the popular "little planet" view. Here the first video formatted as an uncropped little planet:



Finally, an alternative to using a cube face for reformatting a 360 is to use the flat, i.e. regular video, option:

ffmpeg -i input -vf v360=e:flat:yaw=180 flat.mp4
 

cool, thanks for the detailed infos!