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I have to convert some video to "h264" using FFmpeg.When I hit the below command as a cloud user with ssh login it converts successful.

 ffmpeg -i /var/www/media/photos/video_demo/55291482115655.MP4 -codec:v libx264 -profile:v high -preset slow -b:v 500k -maxrate 500k -bufsize 1000k -vf scale=-1:300 -threads 0 -pass 1 -codec:a libfdk_aac -b:a 500k -f mp4 /var/www/media/photos/video_demo/5888.MP4.

But when I run this command using PHP it gives me an error.

$cmd = "ffmpeg -i /var/www/media/photos/video_demo/55291482115655.MP4 -codec:v libx264 -profile:v high -preset slow -b:v 500k -maxrate 500k -bufsize 1000k -vf scale=-1:300 -threads 0 -pass 1 -codec:a libfdk_aac -b:a 500k -f mp4 /var/www/media/photos/video_demo/85493.MP4 ";
  exec($cmd .' 2>&1', $outputAndErrors, $return_value);



  php error: Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

I also followed this link similar to my problem but still not get solution for this problem,In my server there is 3 FFmpeg installed.

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