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c797e948c8
With this patch, uuid_write_png is able to capture screenshots from both legs of a bridged video call. It still expects a uuid and filename for the first two arguments. If given a third argument, it must be concat or split. If concat is specified, screenshots from both ends are taken and written side by side to the given filename. If one image is shorter than the other then it is padded with black and vertically centered. If the third argument is split then the two screenshots are written to separate files. In this case, a second filename is expected as a fourth argument.