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Summary: How do I get VideoStitch Studio, AutoPano Video, or any other video stitcher to properly crop an equirectangular or cylindrical projection?

Details: I am creating a wide-angle video from two GoPro (120° HFoV each) overlapped by about 50%. The desired end result is about 190° horizontal, 45° vertical. When I bring two (synchronized) video frames into Hugin as pictures, I can set up a stitch and projection and crop…

Two warped images with crop markers
(Ignore the phantom hand and unblended screenshot)

…and Hugin produces the result I want:
enter image description here

However, when I bring the two videos into either VideoStitch Studio or AutoPano Video I can get the two videos synchronized and calibrated, but I cannot figure out how to crop the projection to include the region of interest. (With VideoStitch Studio I even load the Hugin .pto file; I thought this should include the crop.) The videos they produce are always a small region of the video inside a sea of black:
enter image description here

Using either of these two video-stitchers—or any other process—how can I get Hugin-like cropping of my videos?

(The final video dimensions will be very high resolution, on the order of 6k horizontal pixels, so I'd strongly prefer not to say "Just render it extra extra big and then use After Effects to crop out the center.")

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  • I do know that there are several stitching artifacts, both in the "result I want" image and the screenshot of the video. At this point I'm trying to figure out the proper production pipeline—which software to buy—and so I'm not yet spending a lot of time getting really good control points set up in any package.
    – Phrogz
    Feb 20, 2017 at 17:34
  • Getting closer: in AutoPano Video I can open the Preview pane, click on the tiny "Authoring" tab in the Timeline pane, and then the projection mode can be changed and I can drag and zoom the view. I still can't set an arbitrary aspect ratio, nor crop asymmetrically around the 'horizon'.
    – Phrogz
    Feb 21, 2017 at 14:01
  • Support from VideoStitch Studio wrote: "Right you will only be able to create a full sphere is Studio in an equirectangular projection (no zoom, no crop) but it will enable you to bypass the template options. In my opinion, stitching 2 videos might not be the best option for what you are trying to do as they will be stitched in a full sphere (using a wider lens on your camera might be better)." So: VideoStitch Studio cannot produce the output.
    – Phrogz
    Feb 21, 2017 at 18:09

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