ffmpeg Progress Bar - Encoding Percentage in PHP

Question

I\'ve written a whole system in PHP and bash on the server to convert and stream videos in HTML5 on my VPS. The conversion is done by ffmpeg in the background and the conten

Answer 1

Okay, I've found what I needed - and hopefully this helps someone else as well!

First and foremost, you want to output the ffmpeg data to a text file on the server.

ffmpeg -i path/to/input.mov -vcodec videocodec -acodec audiocodec path/to/output.flv 1> block.txt 2>&1

So, the ffmpeg output is block.txt. Now in PHP, let's do this!

$content = @file_get_contents('../block.txt');

if($content){
    //get duration of source
    preg_match("/Duration: (.*?), start:/", $content, $matches);

    $rawDuration = $matches[1];

    //rawDuration is in 00:00:00.00 format. This converts it to seconds.
    $ar = array_reverse(explode(":", $rawDuration));
    $duration = floatval($ar[0]);
    if (!empty($ar[1])) $duration += intval($ar[1]) * 60;
    if (!empty($ar[2])) $duration += intval($ar[2]) * 60 * 60;

    //get the time in the file that is already encoded
    preg_match_all("/time=(.*?) bitrate/", $content, $matches);

    $rawTime = array_pop($matches);

    //this is needed if there is more than one match
    if (is_array($rawTime)){$rawTime = array_pop($rawTime);}

    //rawTime is in 00:00:00.00 format. This converts it to seconds.
    $ar = array_reverse(explode(":", $rawTime));
    $time = floatval($ar[0]);
    if (!empty($ar[1])) $time += intval($ar[1]) * 60;
    if (!empty($ar[2])) $time += intval($ar[2]) * 60 * 60;

    //calculate the progress
    $progress = round(($time/$duration) * 100);

    echo "Duration: " . $duration . "
";
    echo "Current Time: " . $time . "
";
    echo "Progress: " . $progress . "%";

}

This outputs the percentage of time left.

You can have this as the only piece of text echoed out to a page, and from another page you can perform an AJAX request using jQuery to grab this piece of text and output it into a div, for example, to update on your page every 10 seconds. :)