[greenythebeast]

Originally Posted by Elgero

I've been playing around with the FlvFixer script for a while. I know that packet 2021, 4181, 8230 and 10607 are keyframes and I have currently hardcoded them as a test.

The code below works fine, it extracts the parts from keyframe 2021 to 4181 and from keyframe 8230 to 10607. The only problem I don't know how to solve is fixing the timestamps. The timestamps of the first part are fixed correctly, but not the second part.

Is there an "easy" fix for that?

  while ($filePos < $fileLen)
    {
      $flvTag     = fread($flvIn, $tagHeaderLen);
      $tagPos     = 0;
      $packetType = ReadByte($flvTag, $tagPos);
      $packetSize = ReadInt24($flvTag, $tagPos + 1);
      $packetTS   = ReadInt24($flvTag, $tagPos + 4);
      $packetTS   = $packetTS | (ReadByte($flvTag, $tagPos + 7) << 24);
      $flvTag      = $flvTag . fread($flvIn, $packetSize + $prevTagSize);
      $totalTagLen = $tagHeaderLen + $packetSize + $prevTagSize;
      if (strlen($flvTag) != $totalTagLen)
        {
          DebugLog("Broken FLV tag encountered! Aborting further processing.");
          break;
        }

      $PacketCount += 1;

      if (($PacketCount >= 2021 and $PacketCount <= 4181) or ($PacketCount >= 8230 and $PacketCount <= 10607))
        {

        if (($baseTS === false) and (($packetType == AUDIO) or ($packetType == VIDEO)))
          $baseTS = $packetTS;
        if ($baseTS > 1000)
          {
            $packetTS -= $baseTS;
            WriteFlvTimestamp($flvTag, $tagPos, $packetTS);
          }

        switch ($packetType)
          {
            case AUDIO:
                if ($packetTS >= $prevAudioTS - TIMECODE_DURATION * 5)
                  {
                    $FrameInfo = ReadByte($flvTag, $tagPos + $tagHeaderLen);
                    $CodecID   = ($FrameInfo & 0xF0) >> 4;
                    if ($CodecID == CODEC_ID_AAC)
                      {
                        $AAC_PacketType = ReadByte($flvTag, $tagPos + $tagHeaderLen + 1);
                        if ($AAC_PacketType == AAC_SEQUENCE_HEADER)

Will Avidemux do what you want? http://fixounet.free.fr/avidemux/