public static function fixFlvTimestamps($srcName, $outName)
{
$flv_wrapper = new myFlvHandler($srcName);
$header = $flv_wrapper->getHeader();
$fh = fopen($outName, "wb");
fwrite($fh, $header);
$aTS = 0;
$aInsaneTS = null;
$vTS = 0;
$vInsaneTS = null;
while (true) {
list($type, $size, $timestamp, $keyframe, $start_pos, $data) = $flv_wrapper->getNextTag(myFlvHandler::GET_NEXT_TAG_ALL);
if (!isset($type)) {
break;
}
$fixedTS = null;
switch ($type) {
case myFlvHandler::TAG_TYPE_AUDIO:
if (!isset($aInsaneTS) && $timestamp - $aTS > 200) {
$aInsaneTS = $timestamp - $aTS;
}
if (isset($aInsaneTS)) {
$fixedTS = $timestamp - $aInsaneTS;
}
$aTS = $timestamp;
break;
case myFlvHandler::TAG_TYPE_VIDEO:
if (!isset($vInsaneTS) && $timestamp - $vTS > 200) {
$vInsaneTS = $timestamp - $vTS;
}
if (isset($vInsaneTS)) {
$fixedTS = $timestamp - $vInsaneTS;
}
$vTS = $timestamp;
break;
case myFlvHandler::TAG_TYPE_METADATA:
break;
default:
continue;
}
if ($size == self::TAG_WRAPPER_SIZE) {
// dont write tag with no actual data
continue;
}
if (isset($fixedTS)) {
$data = self::updateFlvTagTimestamp($data, $fixedTS);
}
fwrite($fh, $data);
}
fclose($fh);
}
public static function fixRed5WebcamFlv($flv_file_name, $new_file)
{
$flv_wrapper = new myFlvHandler($flv_file_name);
$header = $flv_wrapper->getHeader();
// sort timestamps because of a bug in red5 webcam recording
$sorted_tags = array();
$index = "";
$tag_count = 0;
$last_pos = $flv_wrapper->pos;
while ($tag = $flv_wrapper->getNextTag()) {
// list($type, $size, $timestamp, $keyframe, $start_pos) = $tag;
$index = sprintf("%010d%06d", $tag[self::TAG_FIELD_TIMESTAMP], ++$tag_count);
$sorted_tags[$index] = $last_pos;
$last_pos = $flv_wrapper->pos;
}
ksort($sorted_tags, SORT_NUMERIC);
$fh = fopen($new_file, "wb");
fwrite($fh, $header);
foreach ($sorted_tags as $timestamp => $pos) {
$flv_wrapper->seek($pos);
list($type, $size, $timestamp, $keyframe, $start_pos, $data) = $flv_wrapper->getNextTag(myFlvHandler::GET_NEXT_TAG_ALL);
if ($size != self::TAG_WRAPPER_SIZE) {
// dont write tag with no actual data
fwrite($fh, $data);
}
}
fclose($fh);
}
