Python发送和接收RTP包

Question

我想通过RTP发送多媒体数据。我想知道的是如何用Python发送和接收RTP包。我找到了python类DPKT。但无法找到一个很好的参考来展示如何在RTP中生成每个字段。

如果有人能够帮助我在服务器上生成和接收rtp数据包，我将不胜感激。

Answer 1

经过几天的研究，我能够在Ubuntu终端中使用gstreamer来完成上述任务。我的主要范围是了解流的同步。我在gstreamer中使用了RTP和RTCP功能。我将视频垂直分成四部分，从一台PC发送到另一台，并显示在第二台PC上。以下是使用的代码。

发件人：

gst-launch -v \ 
\ 
gstrtpbin name=rtpbin1 \ 
filesrc location=/home/x101.avi ! decodebin ! x264enc ! rtph264pay ! rtpbin1.send_rtp_sink_0 \ 
rtpbin1.send_rtp_src_0 ! udpsink host=192.168.1.100 port=5011 \ 
rtpbin1.send_rtcp_src_0 ! udpsink host=192.168.1.100 port=5012 \ 
udpsrc port=5013 ! rtpbin1.recv_rtcp_sink_0 \ 
\ 
gstrtpbin name=rtpbin2 \ 
filesrc location=/home/x102.avi ! decodebin ! x264enc ! rtph264pay ! rtpbin2.send_rtp_sink_0 \ 
rtpbin2.send_rtp_src_0 ! udpsink host=192.168.1.100 port=5021 \ 
rtpbin2.send_rtcp_src_0 ! udpsink host=192.168.1.100 port=5022 \ 
udpsrc port=5023 ! rtpbin2.recv_rtcp_sink_0 \ 
\ 
gstrtpbin name=rtpbin3 \ 
filesrc location=/home/x103.avi ! decodebin ! x264enc ! rtph264pay ! rtpbin3.send_rtp_sink_0 \ 
rtpbin3.send_rtp_src_0 ! udpsink host=192.168.1.100 port=5031 \ 
rtpbin3.send_rtcp_src_0 ! udpsink host=192.168.1.100 port=5032 \ 
udpsrc port=5033 ! rtpbin3.recv_rtcp_sink_0 \ 
\ 
gstrtpbin name=rtpbin4 \ 
filesrc location=/home/x104.avi ! decodebin ! x264enc ! rtph264pay ! rtpbin4.send_rtp_sink_0 \ 
rtpbin4.send_rtp_src_0 ! udpsink host=192.168.1.100 port=5041 \ 
rtpbin4.send_rtcp_src_0 ! udpsink host=192.168.1.100 port=5042 \ 
udpsrc port=5043 ! rtpbin4.recv_rtcp_sink_0 

接收机：

gst-launch -v \ 
videomixer name=mix ! ffmpegcolorspace ! autovideosink sync=false async=false \ 
\ 
gstrtpbin name=rtpbin1 \ 
udpsrc port=5011 caps = "application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264, sprop-parameter-sets=(string)\"Z01AFeygbCPNLgIgAAADAC7msoAB4sWywA\\=\\=\\,aOvssg\\=\\=\", payload=(int)96, ssrc=(uint)861153369, clock-base=(uint)4026289255, seqnum-base=(uint)30449" ! rtpbin1.recv_rtp_sink_0 rtpbin1. ! rtph264depay ! queue ! ffdec_h264 ! videobox border-alpha=0 top=0 left=0 ! mix. \ 
udpsrc port=5012 ! rtpbin1.recv_rtcp_sink_0 \ 
rtpbin1.send_rtcp_src_0 ! udpsink port=5013 host=192.168.1.104 \ 
\ 
gstrtpbin name=rtpbin2 \ 
udpsrc port=5021 caps = "application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264, sprop-parameter-sets=(string)\"Z01AFeygbCPNLgIgAAADAC7msoAB4sWywA\\=\\=\\,aOvssg\\=\\=\", payload=(int)96, ssrc=(uint)861153369, clock-base=(uint)4026289255, seqnum-base=(uint)30449" ! rtpbin2.recv_rtp_sink_0 rtpbin2. ! rtph264depay ! queue ! ffdec_h264 ! videobox border-alpha=0 top=-120 left=0 ! mix. \ 
udpsrc port=5022 ! rtpbin2.recv_rtcp_sink_0 \ 
rtpbin2.send_rtcp_src_0 ! udpsink port=5023 host=192.168.1.104 \ 
\ 
gstrtpbin name=rtpbin3 \ 
udpsrc port=5031 caps = "application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264, sprop-parameter-sets=(string)\"Z01AFeygbCPNLgIgAAADAC7msoAB4sWywA\\=\\=\\,aOvssg\\=\\=\", payload=(int)96, ssrc=(uint)861153369, clock-base=(uint)4026289255, seqnum-base=(uint)30449" ! rtpbin3.recv_rtp_sink_0 rtpbin3. ! rtph264depay ! queue ! ffdec_h264 ! videobox border-alpha=0 top=-240 left=0 ! mix. \ 
udpsrc port=5032 ! rtpbin3.recv_rtcp_sink_0 \ 
rtpbin3.send_rtcp_src_0 ! udpsink port=5033 host=192.168.1.104 \ 
\ 
gstrtpbin name=rtpbin4 \ 
udpsrc port=5041 caps = "application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264, sprop-parameter-sets=(string)\"Z01AFeygbCPNLgIgAAADAC7msoAB4sWywA\\=\\=\\,aOvssg\\=\\=\", payload=(int)96, ssrc=(uint)861153369, clock-base=(uint)4026289255, seqnum-base=(uint)30449" ! rtpbin4.recv_rtp_sink_0 rtpbin4. ! rtph264depay ! queue ! ffdec_h264 ! videobox border-alpha=0 top=-360 left=0 ! mix. \ 
udpsrc port=5042 ! rtpbin4.recv_rtcp_sink_0 \ 
rtpbin4.send_rtcp_src_0 ! udpsink port=5043 host=192.168.1.104 

我能收到四流在一个窗口预期。但是仍然流不完全同步。

Answer 2

您还可以将来自RTP流的音频有效载荷与rtpdump一起传输到SoX。我最近写了一个小Python脚本来做到这一点。

https://github.com/kylophone/xplay