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get_y_image() wraps the decoder Y plane zero-copy but recorded FFALIGN(width,32) as the Image stride instead of the frame's real linesize[0]. For widths that are not a multiple of 32 the decoder packs the plane tighter than FFALIGN, so: - Image::Rotate/Flip re-derived the source stride via av_image_fill_arrays(...,32) and read past the end of the borrowed plane (and skewed Y-channel motion analysis, which reads the same buffer). - Image::Flip sized its destination from this->size, which is tight for a borrowed plane and smaller than the 32-aligned layout the planes are written at, overrunning the destination. Record the frame's real linesize in get_y_image(); use the Image's own linesize for the source plane-0 stride in Rotate/Flip; size Flip's destination from av_image_get_buffer_size(...,32). All are no-ops for self-consistent ZM-allocated (32-aligned) images. tests/zm_image_linesize.cpp: Rotate 90/180/270 and Flip H/V over a tight, non-32-aligned GRAY8 source verifying correct output. refs #4788 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>