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This reduces the amount the horizontal filters read beyond the filter width to a consistent 1 pixel. The data is not used so this is usually not noticeable. It becomes a problem when the application allocates frame buffers only for the aligned picture size and the end of it is at a page boundary. This happens for picture sizes which are a multiple of the page size like 1280x640. The frame buffer allocation is based on its most likely done via mmap + MAP_ANONYMOUS so start and end of the buffer are page aligned and the previous and next page are not necessarily mapped. Under these conditions like seen by Firefox a read beyond the end of the buffer results in a segfault. After the over-read is reduced to a single pixel it's reasonable to use VP9's emulated edge motion compensation for this. Fixes: https://bugzilla.mozilla.org/show_bug.cgi?id=1881185 Signed-off-by: Janne Grunau <janne-ffmpeg@jannau.net> Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>