title: mergExt - mergAV, trying to know if the video can be saved to camera roll
body: <p>I'm trying to know if the video can be saved to camera roll of the Device.</p>
  
  <p>I use Device -> Settings -> Privacy -> Photos to negate or give permission to save on Camera Roll.</p>
  
  <ol>
  <li>First I tried by check before to use the command mergAVSaveVideo:</li>
  </ol>
  
  <blockquote>
  <pre><code>on mergAVCamRecordingFinished pFile
     if mergAVCanSaveVideo(pFile) then
        answer "OK"
     else
        answer "NO"
     end if 
  
     mergAVSaveVideo pFile
  end mergAVCamRecordingFinished
  </code></pre>
  </blockquote>
  
  <p>It answer me "OK" also if the video is not saved. </p>
  
  <ol>
  <li>Then I tryed to use the results:</li>
  </ol>
  
  <blockquote>
  <pre><code>on mergAVCamRecordingFinished pFile
     mergAVSaveVideo pFile
     answer result
  end mergAVCamRecordingFinished
  </code></pre>
  </blockquote>
  
  <p>Here the answer dialog don't appears.</p>
  
  <ol>
  <li>Then I tried to catch the error</li>
  </ol>
  
  <blockquote>
  <pre><code>   try
        mergAVSaveVideo pFile
     catch e
        answer e
     end try
  </code></pre>
  </blockquote>
  
  <p>Here the error is always the same, whether it can save whether it can't save:</p>
  
  <p>634,0,0 string conversion failed 573,13,1,mergAVSaveVideo.</p>
  
  <p>Any advice?</p>