private static function evaluateTargetVideoFramerate(KDLVideoData $source, KDLVideoData $target)
{
/*
* Frame Rate - If the flavor fps is zero, evaluate it from the source and
* the constants theshold.
*/
if ($target->_frameRate == 0) {
$target->_frameRate = $source->_frameRate;
if ($target->_frameRate > KDLConstants::MaxFramerate) {
$target->_warnings[KDLConstants::VideoIndex][] = KDLWarnings::ToString(KDLWarnings::TruncatingFramerate, KDLConstants::MaxFramerate, $target->_frameRate);
$target->_frameRate = $target->_frameRate == 50 ? 25 : KDLConstants::MaxFramerate;
} else {
if ($target->_frameRate == 0 && $source->IsFormatOf(array("h.263"))) {
$target->_frameRate = 24;
}
}
/*
* For frame rates to comply w/HLS (relevant for low br 110 and 200 kfps)
*
* 110 - either 10 (for ~30fps) or 8 (for 24/25fps)
* 200 - for 24 to 30fps, take half of the original targetFR
* otherwise - keep the targetFR (the targetFR<24)
*/
if ($target->_isFrameRateForLowBrAppleHls) {
if ($target->_bitRate <= 110) {
$target->_frameRate = $target->_frameRate >= 29.97 ? 10 : 8;
} else {
if ($target->_bitRate <= 200 && round($target->_frameRate) >= 24) {
$target->_frameRate = round($target->_frameRate / 2, 2);
}
}
}
}
/*
* MPEG2 constraint - target fps should be at least 20
*/
if ($target->_id == KDLVideoTarget::MPEG2) {
$target->_frameRate = max(20, $target->_frameRate);
}
return $target->_frameRate;
}
private static function evaluateTargetVideoFramerate(KDLVideoData $source, KDLVideoData $target)
{
/*
* Frame Rate - If the flavor fps is zero, evaluate it from the source and
* the constants theshold.
*/
if ($target->_frameRate == 0) {
$target->_frameRate = $source->_frameRate;
if (isset($target->_maxFrameRate) && $target->_maxFrameRate > 0) {
$maxFR = $target->_maxFrameRate;
} else {
$maxFR = KDLConstants::MaxFramerate;
}
if ($target->_frameRate > $maxFR) {
$target->_warnings[KDLConstants::VideoIndex][] = KDLWarnings::ToString(KDLWarnings::TruncatingFramerate, $maxFR, $target->_frameRate);
$target->_frameRate = $target->_frameRate == 50 ? 25 : $maxFR;
} else {
if ($target->_frameRate == 0 && $source->IsFormatOf(array("h.263", "h263", "sorenson spark", "vp6"))) {
$target->_frameRate = 24;
}
}
/*
* For frame rates to comply w/HLS (relevant for low br 110 and 200 kfps)
*
* 110 - either 10 (for ~30fps) or 8 (for 24/25fps)
* 200 - for 24 to 30fps, take half of the original targetFR
* otherwise - keep the targetFR (the targetFR<24)
*/
if ($target->_isFrameRateForLowBrAppleHls) {
if ($target->_bitRate <= 110) {
$target->_frameRate = $target->_frameRate >= 29.97 ? 10 : 8;
} else {
if ($target->_bitRate <= 200 && round($target->_frameRate) >= 24) {
$target->_frameRate = round($target->_frameRate / 2, 2);
}
}
}
}
/*
* MPEG2 constraint - target fps should be at least 20
*/
if ($target->_id == KDLVideoTarget::MPEG2) {
$target->_frameRate = max(20, $target->_frameRate);
}
//Frame rate smaller than 1 causes Memory Fatal Error so in this case set it to 1
//Changed the setting to force the frame rate from 1 to 5 since we noticed in some cases this causes mp4 h264 assets to played unusually like in a fast forward mode
if ($target->_frameRate > 0 && $target->_frameRate < 1) {
$target->_frameRate = 5;
}
return $target->_frameRate;
}
