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• RTP livestream to browser using FFMPEG/nginx

  21 avril 2020, par Niels

  I have a streaming transcoder which converts a high bandwidth fiber stream to a multicast RTP stream. I want to be able to show this stream to a client in a browser. There are 2 issues if I understand correctly :

  



  

  1. The client most likely does not support multicast over his network

  


  2. RTP cannot be played in a browser, so this needs to be converted to another format

  


  



  What I have done so far (using FFMPEG) :

  



  Method 1 : copy the stream to a .m3u8 without muxing, then hosting it with a Webserver (Nginx)
ffmpeg -protocol_whitelist file,udp,rtp -i ./stream.sdp -c:v copy -c:a copy -bufsize 50k -flags -global_header -hls_time 1 -f hls -hls_playlist_type event -hls_list_size 3 ./video/stream.m3u8

  



  Method 2 : enable HLS on Nginx and convert the stream to RTMP
ffmpeg -protocol_whitelist file,udp,rtp -i ./stream.sdp -vcodec libx264 -vprofile baseline -acodec aac -strict -2 -f flv rtmp://localhost/show/stream

  



  Both of these methods result in a working livestream, but the delay remains around 5 seconds.

  



  Is there any way to make the livestream faster ? The multicast livestream has around a 1 second delay at max.

  


• Controlling "Real-Time" sending rate in RTP Streaming with FFMpeg

  14 décembre 2020, par Robert_Ordis

  I'm trying to build an experimental audio telephony system with ffmpeg to talk some G.711 VoIP machine.

  


  Then, I tried this command.

  


  .\ffmpeg.exe -re -f dshow -i audio="CABLE Output (VB-Audio Virtual Cable)" -ac 1 -ab 64k -ar 8000 -f mulaw -f rtp "rtp://192.168.3.175:4449?fifo_size=240&localrtpport=5100&pkt_size=240"


  


  In WireShark capturing, the audio in each packets was actually divided in each around 30[ms].

  


  However, 17- 18 packets was sent together once per 500[ms].

  


  Sent audio was correct, but in this situation, an opponent machine can't treat this correctly.

  


  How do I send these packets in per "UNDER 0.5 SEC" ?

  


• Configure NVR to accept video stream from IP camera routed through PC

  11 juin 2021, par BenStackover

  I currently have an IP camera connected to an ethernet port on my PC. I also have my PC connected to a network switch via another ethernet cable. I have a NVR connected to the same network switch. I would like to be able to access the video stream from the camera (that is connected to the PC) on the NVR. I have tried restreaming the camera feed using ffmpeg and udp :

  


  ffmpeg -i 'rtsp://user:pwd@192.168.xxx.xxx:554' -preset ultrafast -tune zerolatency -codec:v libx264 -f mpegts udp://admin:admin@192.168.yyy.yyy:8090

  


  where the xxx.xxx is my PC and yyy.yyy is the NVR however the NVR cannot connect. If I connect another PC to the same network switch and change yyy.yyy to that PC's IP I can view the stream.

  


  I have also tried setting up ffserver as an rtsp server using ffserver and can view the rtsp stream from the first PC on the second PC using ffplay rtsp://192.168.xxx.xxx/test1.sdp on the second PC after launching the server on the first PC. I cannot connect to the same stream from the NVR.

  


  Can anyone tell me if what I am attempting to do is even possible ? Ie. how can I make my NVR see a video stream that isn't directly from an IP camera ?

  


  Any help would be much appreciated.

  


  Thanks !