ffmpeg Not converting some mov videos to mp4 -

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i using ffmpeg convert videos, command works fine videos format including mov not converting mov videos,i don't understand problem in mov video? although video playing on player commands trying :

$command = "$ffmpeg_path -i $video_path -acodec copy -ar 22050 -ab 32 -f mp4 -s 858x480 $mobile_video.mp4";

or

$command="$ffmpeg_path -i $video_path -codec:v libx264 -preset slow -b:v 550k -maxrate 550k -bufsize 1100k -threads 0 -codec:a libfdk_aac -b:a 128k $mobile_video.mp4";

or

$command="$ffmpeg_path -i $video_path -vcodec copy -acodec copy $mobile_video.mp4";

i try these commands mov videos not converted mp4

interesting comment because there entire discussion (and possible answer) here: ffmpeg convert mov file mp4 html5 video tag ie9

ffmpeg -i input.mov -c:v libx264 -c:a libfaac -strict experimental output.mp4

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