#2151: Warning: data is not aligned! This can lead to a speedloss --------------------------------+----------------------------------- Reporter: viric | Owner: (none) Type: defect | Status: closed Priority: normal | Component: swscale Version: 1.1 | Resolution: invalid Keywords: | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | --------------------------------+----------------------------------- Changes (by Niklas Haas): * resolution: => invalid * status: new => closed Comment: I'm pretty sure this is an unavoidable consequence of cropping to an unaligned offset. There is nothing we can do about this except do a full memcpy into an aligned buffer, which I'm pretty sure will not help. swscale.c prints this message whenever the data pointers are not a multiple of 16, and since the yuv422p chroma plane is subsampled by a factor of 2 (in the horizontal direction), that means the chroma plane now starts at an offset of 8 (relative to the aligned image start). Closing since everything is "working as intended". The message is just letting you know that you are requesting a crop that will inevitably slow down scaling. -- Ticket URL: <https://trac.ffmpeg.org/ticket/2151#comment:3> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker