I made a .mov h265 file with alpha, which works fine in other software, but blender doesn’t respect the alpha channel and outputs black on the parts where it should be transparent. i made sure the alpha channel was properly connected to the alpha input on the principled shader, but no luck so far. What could be wrong? does blender (3.1.2) even fully support this codec?
As I know, you could convert video source to PNG sequence with “other software” (you mentioned).
And import PNG sequence into Blender.
Blender support alpha channel in PNG image.
yeah i did that (tiff) in the meantime.
Blender also (as every other app) uses libraries which sometimes can’t do everthing what they are meant for. See https://docs.blender.org/manual/en/latest/files/media/video_formats.html
and there especially limitations of ffmpeg…