#2151: Warning: data is not aligned! This can lead to a speedloss
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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 |
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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.
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Ticket URL: <https://trac.ffmpeg.org/ticket/2151#comment:3>
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