static QImage getFrame(Mlt::Producer *producer, int framepos, int frameWidth, int displayWidth, int height);
static QImage getFrame(Mlt::Frame *frame, int frameWidth, int displayWidth, int height);
/** @brief Calculates image variance, useful to know if a thumbnail is interesting.
* @return an integer between 0 and 100. 0 means no variance, eg. black image while bigger values mean contrasted image
* */
static QImage getFrame(Mlt::Producer *producer, int framepos, int frameWidth, int displayWidth, int height);
static QImage getFrame(Mlt::Frame *frame, int frameWidth, int displayWidth, int height);
/** @brief Calculates image variance, useful to know if a thumbnail is interesting.
* @return an integer between 0 and 100. 0 means no variance, eg. black image while bigger values mean contrasted image
* */