From cubmap to equirectangular about transform360 HOT 7 CLOSED

I've added an option to specify different input_layout. You can now pass cubemap_32 in the input_layout and equirect as an output_layout. It'll generate an equirect from the cubemap_32 layout.
It doesn't let you use multiple videos. But if you combine them into single cubemap_32 layout then you can get the equirect output. Depending on what expansion around the faces you use, you may want to specify the input_expand_coef. If you don't use any expansion around the edges of each face, then specify input_expand_coef=1.0

Example command to run reverse cubemap_32 to equirectangular format is:

ffmpeg -i input.mp4 -vf transform360=input_layout=cubemap_32:input_expand_coef=1.0:output_layout=equirect:w=2048:h=1024 -c:v libx264 -preset veryfast -crf 10 -threads 0 -c:a copy output.mp4

from transform360.

You probably can use complex filter to merge 6 images into 1 and then chain transform filter with it. Example of complex filters: https://github.com/nwochaadim/ffmpeg-installation/wiki/Applying-complex-filters-to-videos

from transform360.

Equirect -> cubemap is a lossy transformation, as the resolution of the former is higher than the latter. This implies that a cubmap -> equirect transform would not be possible without interpolation which will degrade the image quality.

from transform360.

That's right, but one might adjust the resolution of the cubemap to ensure the equirect at desired resolution will not be affected too much by interpolation. Let say I want a 4k equirect (about 2160p), I would produce a cubemap with each face side having 2048px - or the correct amount so that the interpolation does not affect too much the result.

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thanks a lot! would be very helpful to be able to provide six input sequences - 6 images for each frame of the 360 sequence, the naming to be defined by ffmpeg if images are given in determined order (first input is front, second is left, ...), but I imagine it will require more work. Nice addition!

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@evgenykuzyakov @jo-chemla @kcircnc Do you know to change the order of the faces cubemap?

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How about YouTube's cube map to equirectangular?

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