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I use avconv to get a preview image of a video clip. The command is

avconv -i video.mp4 -vframes 1 -s 100x100 cover.jpeg

It works but I would like to have correct dimensions of the output jpeg. For example to be the half size of the input video. So I execute

avconv -i video.mp4 -vframes 1 -s 'iw/2:ih/2' cover.jpeg

but this just causes Invalid frame size: iw/2:ih/2 error. How should I pass advanced scale options to avconv in command line?

Greg Dan
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1 Answers1

1

Try

avconv -i video.mp4 -vframes 1 -vf "scale=iw/2:ih/2" cover.jpeg
aabhas
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