Its possible to run cropdetect and crop in one line and get thumbs from video?
something like this
ffmpeg -ss 1 -i 0.flv -vf cropdetect=24:16:0,crop=w:h:x:y -vcodec mjpeg -vframes 1 -an -f rawvideo -s 240x180 0.jpg
Or maybe need to run in 2 line, first run cropdetect and than run crop and generate thumbs from video, but in this way i need to get value from cropdetect?
cropdetect outputs to the console, so you can parse the output and then use it as a variable:
ffmpeg -i input -t 1 -vf cropdetect -f null - 2>&1 | awk '/crop/ { print $NF }' | tail -1
This will result in something like:
crop=640:480:0:50
Then run your actual crop command:
ffmpeg -i input -vf $cropvalue,scale=240:-1 -vframes 1 -qscale:v 2 output.jpg
-vcodec mjpeg, -an, and -f rawvideo are superfluous
Use -qscale:v to control jpg output quality. A sane range is 2-5 (a lower value is a higher quality).
Use the scale filter instead of -s; especially if you're already using filters. Also the scale filter will allow you to set a specific width or height and with -1 it will automatically provide the correct value to preserve aspect. Otherwise if you try to force a specific size you can risk a squished or stretched output.
Obviously I'm not a PHP coder, but this should give you an idea at least.
function crop($id){ $d = shell_exec("ffmpeg -i $id -t 1 -vframes 1 -ss 50 -vf cropdetect -f null - 2>&1 | awk '/crop/ { return $NF }' | tail -1"); $array = explode('crop=',$d); $cropvalue = $array[1]; $cropvalue = 'crop='.$cropvalue; return $cropvalue; } and than im call in new line 'crop("111.mp4")'
Commented
Jun 29, 2013 at 23:50
ffmpeg -ss 600 -i $filename -f matroska -t 120 -an -vf cropdetect=24:16:0 -y -crf 51 -preset ultrafast /dev/null 2>&1 | grep -o crop=.* | sort -bh | uniq -c | sort -bh | tail -n1 | grep -o crop=.*
$array = explore('crop=', $d); $cropvalue = $array[1]; on your output. When you explode the output at this value, you would have to use $cropvalue = $array[0]; since arrays start at 0 in PHP. The output of your shell_exec command would be something like crop=1440:1072:240:4 or similar. So, you don't need your explode part and concatenate string. Just use the output of shell_exec, so return shell_exec('...');.
Commented
Apr 5, 2015 at 22:02
-vframes 1 limits the output to 1 frame, and in the case of outputting a single image avoids the error: Could not get frame filename number 2 from pattern 'output.jpg' (either set updatefirst or use a pattern like %03d within the filename pattern). It is used because in the original question wanted to output a single JPEG image. If you want to output a video then remove -vframes 1.