image - avconv generating frames in php -

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i'm trying generate frames (at moment) on localhost server code:

$cmd = 'avconv -i "../videos/medium.mp4" -vsync 1 -r 10 -f image2 -an -y -qscale 20 -s 120*90 -ss 00:00:05 -t 00:00:10 "out_%05d.jpg" 2>&1';  passthru($cmd, $out);

i following message:

[image2 @ 0x646120]could not open file : out_00001.jpg av_interleaved_write_frame(): input/output error failed1

the problem if run command in terminal works. know whats problem? due permisson or else?

before executing $cmd need change directory first, , execute command.

chdir('path_to_your_location/videos/'); $cmd = 'avconv -i "../videos/medium.mp4" -vsync 1 -r 10 -f image2 -an -y -qscale 20 -s 120*90 -ss 00:00:05 -t 00:00:10 "out_%05d.jpg" 2>&1';  passthru($cmd, $out);

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