Recherche avancée

Sur d’autres sites (3453)

• I have a log file with RTP packets : now what ?

  9 mai 2012, par Brannon

  I have a log file with RTP packets coming off of a black box device. I also have a corresponding SDP file (RTSP DESCRIBE) for that. I need to convert this file into some kind of playable video file. Can I pass these two files to FFMpeg or VLC or something else and have it mux that data into something playable ?

  As an alternate plan, I can loop through the individual packets in code and do something with each packet. However, it seems that there are existing libraries for parsing this data. And it seems to do it by hand would be asking for a large project. Is there some kind of video file format that is a pretty raw mix of SDP and RTP ? Thanks for your time.

  Is there a way for FFmpeg or VLC to open an SDP file and then get their input packets through STDIN ?

  I generally use C#, but I could use C if necessary.

  Update 1 : Here is my unworking code. I'm trying to get some kind of output to play with ffplay, but I haven't had any luck yet. It gives me invalid data errors. It does go over all the data correctly as far as I can tell. My output is nearly as big as my input (at about 4MB).

      public class RtpPacket2
  
      {
  
          public byte VersionPXCC;
  
          public byte MPT;
  
          public ushort Sequence; // length?
  
          public uint Timestamp;
  
          public uint Ssrc;
  
          public int Version { get { return VersionPXCC >> 6; } }
  
          public bool Padding { get { return (VersionPXCC & 32) > 0; } }
  
          public bool Extension { get { return (VersionPXCC & 16) > 0; } }
  
          public int CsrcCount { get { return VersionPXCC & 0xf; } } // ItemCount
  
          public bool Marker { get { return (MPT & 0x80) > 0; } }
  
          public int PayloadType { get { return MPT & 0x7f; } } // PacketType
  
      }
  
  
  
  
  
      static void Main(string[] args)
  
      {
  
          if (args.Length != 2)
  
          {
  
              Console.WriteLine("Usage: <input rtp="rtp" file="file" /> <output 3gp="3gp" file="file">");
  
              return;
  
          }
  
          var inputFile = args[0];
  
          var outputFile = args[1];
  
          if(File.Exists(outputFile)) File.Delete(outputFile);
  
  
  
          // FROM the SDP : fmtp 96 profile-level-id=4D0014;packetization-mode=0
  
          var sps = Convert.FromBase64String("Z0LAHoiLUFge0IAAA4QAAK/IAQ=="); //      BitConverter.ToString(sps)  "67-42-C0-1E-88-8B-50-58-1E-D0-80-00-03-84-00-00-AF-C8-01"  string
  
          var pps = Convert.FromBase64String("aM44gA=="); //      BitConverter.ToString(pps)  "68-CE-38-80"   string
  
          var sep = new byte[] { 00, 00, 01 };
  
  
  
          var packet = new RtpPacket2();
  
          bool firstFrame = true;
  
          using (var input = File.OpenRead(inputFile))
  
          using (var reader = new BinaryReader(input))
  
          using (var output = File.OpenWrite(outputFile))
  
          {
  
              //output.Write(header, 0, header.Length);
  
              output.Write(sep, 0, sep.Length);
  
              output.Write(sps, 0, sps.Length);
  
              output.Write(sep, 0, sep.Length);
  
              output.Write(pps, 0, pps.Length);
  
              output.Write(sep, 0, sep.Length);
  
              while (input.Position &lt; input.Length)
  
              {
  
                  var size = reader.ReadInt16();
  
                  packet.VersionPXCC = reader.ReadByte();
  
                  packet.MPT = reader.ReadByte();
  
                  packet.Sequence = reader.ReadUInt16();
  
                  packet.Timestamp = reader.ReadUInt32();
  
                  packet.Ssrc = reader.ReadUInt32();
  
                  if (packet.PayloadType == 96)
  
                  {
  
                      if (packet.CsrcCount > 0 || packet.Extension) throw new NotImplementedException();
  
  
  
                      var header0 = reader.ReadByte();
  
                      var header1 = reader.ReadByte();
  
  
  
                      var fragmentType = header0 &amp; 0x1F; // should be 28 for video
  
                      if(fragmentType != 28) // 28 for video?
  
                      {
  
                          input.Position += size - 14;
  
                          continue;
  
                      }
  
                      var nalUnit = header0 &amp; ~0x1F;
  
                      var nalType = header1 &amp; 0x1F;
  
                      var start = (header1 &amp; 0x80) > 0;
  
                      var end = (header1 &amp; 0x40) > 0;
  
  
  
                      if(firstFrame)
  
                      {
  
                          output.Write(sep, 0, sep.Length);
  
                          output.WriteByte((byte)(nalUnit | fragmentType));
  
                          firstFrame = false;
  
                      }
  
  
  
                      for (int i = 0; i &lt; size - 14; i++)
  
                          output.WriteByte(reader.ReadByte());
  
                      if (packet.Marker)
  
                          firstFrame = true;
  
                  }
  
                  else input.Position += size - 12;
  
              }
  
          }
  
      }
  
  </output>

• how to restream rtsp h264 as "live dvr" for iOs using ffserver ?

  18 mai 2017, par mojovski

  I would like to grab an existing stream from an IP-Camera delivering h264 encoded rtsp stream and restream it for iPhone/Ipad, where the user would have the opportunity to jump back in time for aprox. 1 minute. And later jump back to the "live" feed.

  Actually I would like to do the same as in wowza (http://www.wowza.com/addons/wowza-ndvr-addon) but with ff** software.

  Thank you for all your hints !

• FFmpeg - trying to put a static image over existing video.

  16 juillet 2012, par Loz101

  I am using blob tracker but have timecode on video files. I want to overlay a black box over them therefore preventing the timecode interfering with the tracker. Thanks