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cudacodec::VideoReader returns 4 channels

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Hi, the regular video reader returns 3 channels (BGR) but the gpu version returns 4 channels for the same video. Is there any documentation that could help me understand what format is it returning them? edit, I am on ubuntu 16.04, cuda 7.5, geforce 740M edit2: Further testing revealed that for a 1440x1080 video, it reads a frame of 1440x1088. It adds 8 rows to the bottom.

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