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How to Add a Watermark to Video

FFMPEG filters provide a powerful way to programmatically enhance or alter videos, and it’s fairly simple to add a watermark to a video using the overlay filter. The easiest way to install ffmpeg is to download a pre-built binary for your specific platform. Then you don’t have to worry about including and installing all the right dependencies and codecs you will be using.

Once you have ffmpeg installed, adding a watermark is as easy as passing your existing source through an overlay filter like so:

ffmpeg -i test.mp4 -i watermark.png -filter_complex "overlay=10:10" test1.mp4

Basically, we’re passing in the original video, and an overlay image as inputs, then passing it through the filter, and saving the output as test1.mp4.

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function isValidInteger($integer)
{
    if (filter_var($integer, FILTER_VALIDATE_INT) && $integer > 0) {
        return true;
    } else {
        return false;
    }
}

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function isValidFloat($float)
{
    if (filter_var($float, FILTER_VALIDATE_FLOAT)) {
        return true;
    } else {
        return false;
    }
}

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function isValidString($string)
{
    if (empty($string)) {
        return false;
    }

    if (preg_match("/[\||\'|\<|\>|\[|\]|\"|\!|\?|\$|\@|\/|\\\|\&\~\*\{\+]/", $string)) {
        return false;
    } else {
        return true;

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function isValidUrl($url)
{
    if (empty($url)) {
        return false;
    }

    // only ASCII URL
    if (filter_var($url, FILTER_VALIDATE_URL)) {
        return true;
    } else {

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function isValidEmail($email)
{
    if (empty($email)) {
        return false;
    }

    if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
        if (@count(explode("@", $email)) != 2) {
            return false;
        } else {

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function isValidDate($date, $format = "d-m-Y H:i:s")
{
    //since php 5.3
    $parsedate = date_parse_from_format($format, $date);
    $datetmp = mktime($parsedate['hour'], $parsedate['minute'], $parsedate['second'], $parsedate['month'], $parsedate['day'], $parsedate['year']);

    return (strtotime($date) == $datetmp) ? true : false;
}

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function isValidTax($vatid)
{
    $vatid = str_replace(array(
        ' ',
        '.',
        '-',
        ',',
        ', '), '', trim($vatid));
    $prefix = substr($vatid, 0, 2);
    $number = substr($vatid, 2);

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// look into http://php.net/manual/en/language.types.float.php
function compareFloatValues($a, $b, $operator = '==')
{

    // This value is known as the machine epsilon, or unit roundoff, and is the smallest acceptable difference in calculations.
    $epsilon = 0.00001;

    // make equal to 5 digits of precision
    $a = (float)$a;
    $b = (float)$b;

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	/**
	 * isNetworkAvailable() TRUE wenn eine Datenverbindung vorhanden ist
	 * 
	 * @param mixed activity
	 * @return
	 */
	public static boolean isNetworkAvailable(Activity activity) {
		ConnectivityManager connectivity = (ConnectivityManager) activity.getSystemService(Context.CONNECTIVITY_SERVICE);
		if (connectivity == null) {
			return false;