Hi, I had a look at the failures in Clip_Tests.cpp . Actually comparing with what is done on other architectures, the content of the frame is already wrong before the effect being applied, that is the content that is imported from the test .mp4 seems false. I digged into FFmpegReader.cpp and pixels get wrong content after sws_scale is called in FFmpegReader::ProcessVideoPacket . This function comes from libswscale (ffmpeg) . This library has accelerated altivec code on powerpc for colorspace conversion and forcing use of software processing there makes the Clip tests works.
So I'd say there is some issue in ffmpeg-3.4.2/libswscale/ppc/yuv2rgb_altivec.c or around, that I've not been able to locate so far. F.
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