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• How to send MPEGTS streams over UDP

  24 décembre 2015, par pAkY88

  I am developing a realtime video-streaming system which is composed basically by a server and several clients.

  For now, let’s ignore how packets are forwarded among the server and the clients, let’s focus just on how the server can send a MPEGTS stream over UDP packets.

  The stream is encoded in MPEGTS format.

  What I’m trying to do is reading some packets (the main question is "how many ?") and encapsulating them in UDP packets. The destination (a client) reads these UDP packets and then forward them to VLC, which is able to play MPEGTS network streams by reading UDP packets.

  If I send only video packets, everything works fine, instead if I try to encapsulate in the same UDP packet, both some video packets and some audio packets, VLC is not able to decode and play the stream.
  I read somewhere that each UDP packet should contain 7 TS packets, but unfortunately even if I comply with this rule, VLC doesn’t decode the stream correctly.

  Here is a sample code of my program : http://pastebin.com/evMi6FkY

  How should I encapsulate MPEGTS packets in UDP packets ?

  Thanks !

• VOD HTTP Live Streaming in addition to video delivery using (flash) player

  29 mai 2012, par Luuk D. Jansen

  I have created a delivery system for HTTP Live Streaming using the Play ! framework and FFMPEG. Files are encoded on different bandwidths and subsequent segmented for delivery, current, to iOS devices.

  However, I would like to extend to embedded players (cross platform) on websites and in the future Android devices. What would be the best approach, without having too much hard drive space overhead. I could encode the MP4 files for the different bitrates, and leave them as one file.

  Is there a way that the segmented files (using the FFMPEG segment function) could be used in a Flash player and on Android devices ? It would keep the system simple, as FFMPEG seems to do a good job on creating the segments (taking in account keyframes etc.)

  I could use JWPlayer, but I don't have pseudo-live-streaming, so don't think it could switch and searching would prove difficult. It could also mean that I would need to segment on the fly when a request from an iOS device comes, which adds a small delay and also some hard-drive/processor activity. To overcome the pseudo-live-streaming issue I could redact any request to an Apache server with it enabled, but will add further complexity. Not having pseudo-live streaming for the segmented files doesn't seem that much of an issue as they are only 10 minutes each.

  Anybody who has any thoughts on moving forward.

• FFMpeg undefined reference to get_buffer

  14 juin 2012, par Kevin

  I'm trying to upgrade the FFMpeg source used with one of our projects but get_buffer has gone away. I'm not 100% sure on which method to replace it with. Here are two contexts in which its used, any help is appreciated.

  I look forward to hearing from you soon,

  Thanks,
  Kevin

      cur_offset = avio_tell(pb);
  
      if (!para->playctrl_info.read_end_flag && (0 == pkt->data_size)) {
  
          rev_byte = get_buffer(pb, pbuf, para->max_raw_size);
  
          if ((rev_byte > 0) && (cur_offset <= para->pFormatCtx->data_offset)) {
  
              try_count = 0;
  
              pkt->data_size = rev_byte;
  
              para->read_size.total_bytes += rev_byte;
  
              pkt->avpkt_newflag = 1;
  
              pkt->avpkt_isvalid = 1;
  
  
  
    do {
  
                  read_length = get_buffer(s->pb, data + 12, read_size);
  
                  if ((read_length <= 0) || (sync_flag == 1024)) {
  
                      if (read_length == AVERROR(EAGAIN)) {
  
                          continue;
  
                      } else {
  
                          FREE(data);
  
                          log_error("[%s]get data failed. ret=%d\n", __FUNCTION__, read_length);
  
                          return 0;
  
                      }
  
                  } else {
  
                      break;
  
                  }
  
              } while (retry_get_data < am_p->playctrl_info.read_max_retry_cnt);
  
              pkt = data;