Add parsing for Gopro *.360 format

[smathermather]

GoPRO .360 format is weird. Fortunately, David at Trekview did the homework in this 4 part series:
https://www.trekview.org/blog/2021/reverse-engineering-gopro-360-file-format-part-1/
https://www.trekview.org/blog/2021/reverse-engineering-gopro-360-file-format-part-2/
https://www.trekview.org/blog/2021/reverse-engineering-gopro-360-file-format-part-3/
https://www.trekview.org/blog/2021/reverse-engineering-gopro-360-file-format-part-4/

The TL;DR is that it is a cube format already, but split into 2 video channels, with some (36 pixels) overlap between the cube faces in order to allow for blending.

[smathermather]

An easy way to solve this is with the imagemagick python API replicating (and modifying for resolution of our 1/2 resolution data) this bit of work from here:

# Track 1
# convert -crop 1376x1344+0+0 track0/img1.jpg pre_cubefaces/left_img1.jpg
convert -crop 688x672+0+0 track0/img1.jpg pre_cubefaces/left_img1.jpg

# convert -crop 1344x1344+1376+0 track0/img1.jpg final_cubefaces/forward_img1.jpg
convert -crop 672x672+688+0 track0/img1.jpg final_cubefaces/forward_img1.jpg

# convert -crop 1376x1344+2720+0 track0/img1.jpg pre_cubefaces/right_img1.jpg
convert -crop 688x672+1360+0 track0/img1.jpg pre_cubefaces/right_img1.jpg

# Track 2
# convert -crop 1376x1344+0+0 track1/img1.jpg -rotate pre_cubefaces/bottom_img1.jpg
convert -crop 688x672+0+0 track1/img1.jpg -rotate pre_cubefaces/bottom_img1.jpg

# convert -crop 1344x1344+1376+0 track1/img1.jpg -rotate final_cubefaces/back_img1.jpg
convert -crop 672x672+688+0 track1/img1.jpg -rotate final_cubefaces/back_img1.jpg

# convert -crop 1376x1344+2720+0 track1/img1.jpg pre_cubefaces/top_img1.jpg
convert -crop 688x672+1360+0 track1/img1.jpg pre_cubefaces/top_img1.jpg


# convert -crop 688x1344+0+0 pre_cubefaces/left_img1.jpg precut_cubefaces/left_l_img1.jpg
convert -crop 344x672+0+0 pre_cubefaces/left_img1.jpg precut_cubefaces/left_l_img1.jpg

# convert -crop 688x1344+688+0 pre_cubefaces/left_img1.jpg precut_cubefaces/left_r_img1.jpg
convert -crop 344x672+344+0 pre_cubefaces/left_img1.jpg precut_cubefaces/left_r_img1.jpg

#convert -size 1344x1344 xc:transparent PNG32:precut_cubefaces/left_l_r_img1.png
convert -size 672x672 xc:transparent PNG32:precut_cubefaces/left_l_r_img1.png

convert precut_cubefaces/left_l_r_img1.png precut_cubefaces/left_l_img1.jpg -geometry +0+0 -composite PNG32:precut_cubefaces/left_l_r_img1.png
convert precut_cubefaces/left_l_r_img1.png precut_cubefaces/left_r_img1.jpg -geometry +640+0 -composite PNG32:precut_cubefaces/left_l_r_img1.png

convert -size 672x672 xc:transparent PNG32:precut_cubefaces/left_l_r_img1.png
convert precut_cubefaces/left_l_r_img1.png precut_cubefaces/left_l_img1.jpg -geometry +0+0 -composite PNG32:precut_cubefaces/left_l_r_img1.png

#convert precut_cubefaces/left_l_r_img1.png precut_cubefaces/left_r_img1.jpg -geometry +640+0 -composite PNG32:precut_cubefaces/left_l_r_img1.png
convert precut_cubefaces/left_l_r_img1.png precut_cubefaces/left_r_img1.jpg -geometry +320+0 -composite PNG32:precut_cubefaces/left_l_r_img1.png

###################################
# We don't need the rest of these steps...  #
###################################

##############################################
# But we do need the missing alpha compositing step...  #
##############################################



# convert -size 4032x2688 xc:transparent PNG32:img1_cubemap.png
convert -size 2016x1344 xc:transparent PNG32:img1_cubemap.png

# top row
convert img1_cubemap.png pre_cubefaces/left_img1.jpg -geometry +0+0 -composite PNG32:img1_cubemap.png
convert img1_cubemap.png cubefaces/forward_img1.jpg -geometry +1344+0 -composite PNG32:img1_cubemap.png
convert img1_cubemap.png cubefaces/right_img1.jpg -geometry +2688+0 -composite PNG32:img1_cubemap.png
# bottom row
convert img1_cubemap.png cubefaces/bottom_img1.jpg -geometry +0+1344 -composite PNG32:img1_cubemap.png
convert img1_cubemap.png cubefaces/back_img1.jpg -geometry +1344+1344 -composite PNG32:img1_cubemap.png
convert img1_cubemap.png cubefaces/top_img1.jpg -geometry +2688+1344 -composite PNG32:img1_cubemap.png