On Jul 12, 2012 6:30 PM, "Alexandre Millette" <[email protected]> wrote: > > Hello all. > > I'm working on a C++ video player using libav. > Upon testing with various video formats and files, I've encountered a problem with a small MPEG4/mp4v file (190x240). > The issue is that a small green band (6 px in width) will appear on the right side of the frames. > > This is what I've gathered so far: > - The YUV420 frame read in the stream is ok. > - The RGB32 frame output by sws_scale (there is no resize, the function is used only for conversion purpose) has the green band, so the problem comes from sws_scale. > - The green color comes from the original allocation of the YUV frame (data to 0 equals to a green shade). > - If sws_scale is used also as a resizing device (say converting YUV420 190x240 to RGB32 191x240), there is no colored band, but the frame is of course 1 pixel wider than intended (frame accuracy is an important feature of the project, so this is not acceptable).
I believe your problem could be rooted in bicubic transform. It makes n9 sense when source and target sizes are the same. Try to set linear. > img_convert_ctx = sws_getContext(w, h, PIX_FMT_YUV420P, > w, h, PIX_FMT_RGB32, SWS_BICUBIC, NULL, NULL, NULL); > > Thank you, > Alex M I hope this helps. Alex
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