PHP - avconv create thumbnail wrong rotation -

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in server using avconv library in order generate thumbnails videos. call works fine except image generated got rotated 90 degrees.

here call:

shell_exec("avconv -itsoffset -4  -i $video -vcodec mjpeg -vframes 1 -an -f rawvideo -s 400x244 $thumbnail");

how can remove rotation in order exact image orientation?

it possible using transpose video filter. cannot rotate 180 degrees, can rotate 90 degrees , chain filter.

avconv -i video.mp4 -vf transpose=1,transpose=1 out.mkv

see transpose in avconv manpage: http://manpages.ubuntu.com/manpages/quantal/en/man1/avconv.1.html


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