title: ffmpeg Not converting some mov videos to mp4
body: <p>I am using ffmpeg to convert videos, command works fine for all videos format including mov but it not converting some mov videos,i don't understand is it problem in mov video? although that video playing good on player The commands which i am trying :</p>
  
  <pre><code>$command = "$ffmpeg_path -i $video_path -acodec copy -ar 22050 -ab 32 -f mp4 -s 858x480 $mobile_video.mp4";
  </code></pre>
  
  <p>OR</p>
  
  <pre><code>$command="$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";
  </code></pre>
  
  <p>OR</p>
  
  <pre><code>$command="$ffmpeg_path -i $video_path -vcodec copy -acodec copy $mobile_video.mp4";
  </code></pre>
  
  <p>I try all these commands but some mov videos not converted to mp4</p>