Hi Andrew. The code seems great I have just tried it but can not get a convert video output. I have made some modification for example on video locations and ffmpeg location.

This is my code: Please help. Can not get converted video. thanks
function get_vid_dim($file)
{
    $command = 'ffmpeg -i ' . escapeshellarg($file) . ' 2>&1';
    $dimensions = array();
    exec($command,$output,$status);
    if (!preg_match('/Stream #(?:[0-9.]+)(?:.*): Video: (?P.*) (?P[0-9]*)x(?P[0-9]*)/',implode("n",$output),$matches))
    {
        preg_match('/Could not find codec parameters (Video: (?P.*) (?P[0-9]*)x(?P[0-9]*))/',implode("n",$output),$matches);
    }
    if(!empty($matches['width']) && !empty($matches['height']))
    {
        $dimensions['width'] = $matches['width'];
        $dimensions['height'] = $matches['height'];
    }
    return $dimensions;
}

/*
Takes in a set of video dimensions - original and target - and returns the optimal conversion
dimensions.  It will always return the smaller of the original or target dimensions.
For example: original dimensions of 320x240 and target dimensions of 640x480.
The result will be 320x240 because converting to 640x480 would be a waste of disk
space, processing, and bandwidth (assuming these videos are to be downloaded).

@param $original_width: The actual width of the original video file which is to be converted.
@param $original_height: The actual height of the original video file which is to be converted.
@param $target_width: The width of the video file which we will be converting to.
@param $target_height: The height of the video file which we will be converting to.
@param $force_aspect: Boolean value of whether or not to force conversion to the target's
                      aspect ratio using padding (so the video isn't stretched).  If false, the
                      conversion dimensions will retain the aspect ratio of the original.
                      Optional parameter.  Defaults to true.
@return: An array containing the size and padding information to be used for conversion.
            Format:
            Array
            (
                [width] => int
                [height] => int
                [padtop] => int // top padding (if applicable)
                [padbottom] => int // bottom padding (if applicable)
                [padleft] => int // left padding (if applicable)
                [padright] => int // right padding (if applicable)
            )
***********************************************************************************/
function get_dimensions($original_width,$original_height,$target_width,$target_height,$force_aspect = true)
{
    // Array to be returned by this function
    $target = array();
    // Target aspect ratio (width / height)
    $aspect = $target_width / $target_height;
    // Target reciprocal aspect ratio (height / width)
    $raspect = $target_height / $target_width;
  
    if($original_width/$original_height !== $aspect)
    {
        // Aspect ratio is different
        if($original_width/$original_height > $aspect)
        {
            // Width is the greater of the two dimensions relative to the target dimensions
            if($original_width < $target_width)
            {
                // Original video is smaller.  Scale down dimensions for conversion
                $target_width = $original_width;
                $target_height = round($raspect * $target_width);
            }
            // Calculate height from width
            $original_height = round($original_height / $original_width * $target_width);
            $original_width = $target_width;
            if($force_aspect)
            {
                // Pad top and bottom
                $dif = round(($target_height - $original_height) / 2);
                $target['padtop'] = $dif;
                $target['padbottom'] = $dif;
            }
        }
        else
        {
            // Height is the greater of the two dimensions relative to the target dimensions
            if($original_height < $target_height)
            {
                // Original video is smaller.  Scale down dimensions for conversion
                $target_height = $original_height;
                $target_width = round($aspect * $target_height);
            }
            //Calculate width from height
            $original_width = round($original_width / $original_height * $target_height);
            $original_height = $target_height;
            if($force_aspect)
            {
                // Pad left and right
                $dif = round(($target_width - $original_width) / 2);
                $target['padleft'] = $dif;
                $target['padright'] = $dif;
            }
        }
    }
    else
    {
        // The aspect ratio is the same
        if($original_width !== $target_width)
        {
            if($original_width &1';

    exec($command,$output,$status);

    if($status == 0)
    {
        // Success
        echo 'Woohoo!';
    }
    else
    {
        // Error.  $output has the details
        echo '',join("n",$output),'';
    }
}