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• How to receive MPEGT-TS stream with Pro-MPEG FEC using ffmpeg ?

  1er février 2019, par Antoxic

  I have two Linux computers connected through internet transmitting MPEG-TS from one PC to the other. The connection is not perfect and sometimes the packets get lost. I want to transmit an MPEG-TS from one PC to another using PRO-MPEG in order to enable error correction (FEC). On one computer I’m running ffmpeg with :

  ffmpeg-i "http://1.2.3.4:1234 -map 0 -r 25 -c:v copy -f rtp_mpegts -fec prompeg=l=5:d=5 rtp://4.3.2.1:4321

  And now I need to receive that stream and I want to correct the transmission errors using the FEC info which comes on RTP port +1 and +2. How can I achieve that with ffmpeg ? If it is not possible wit ffmpeg, what other solution can I use ?

  I’m using an ffmpeg snapshot version N-87867-g0655810. I can’t find any information about how to receive it and use the FEC information to recover transmission errors.

• ffmpeg quits if one output stream fails - can this be prevented ? [duplicate]

  5 décembre 2017, par Caius Jard

  This question already has an answer here :

  • ffmpeg rtmp and local file output
    
    1 answer
    
  • FFMPEG : How to stream to multiple outputs with the same encoding independently
    
    2 answers
    

  I’m responsible for maintaining a device that streams a live webcam feed to a remote relay server, and simultaneously writes a version of the stream to the local disk. It does this by a single instance of ffmpeg that has two outputs - one to the local disk, and one over rtsp to the streaming server

  I’m encountering a problem where by if the streaming server disconencts for any reason, ffmpeg quits. I’m not really bothered if the live stream is lost, but it’s a big problem that the local recording is lost also - it’s not a huge detriment to the particular business process if it cannot be watched live, but losing the locally stored copy is a disaster

  ffmpeg is started with a command line similar to :

  ffmpeg -thread_queue_size 4096 -async 1 -f v4l2 
  
    -input_format mjpeg -framerate 30 -video_size 1280x720 
  
    -i /dev/video0 -thread_queue_size 4096 -async 1 -f alsa 
  
    -i plughw:CARD=Set,DEV=0 -r 30 -c:a aac -b:a 96k -c:v h264 -b:v 983040 
  
    -profile:v baseline -preset veryfast -pix_fmt yuv420p 
  
    -f tee -map 0:v -map 1:a 
  
      [f=matroska]'/var/recordings/yyyy-mm-dd/backup.mkv'|
  
      [f=rtsp:rtsp_transport=tcp]rtsp://streamingserver.com:1234/session.sdp`

  Is there any way (command line switch etc) that ffmpeg can be made to carry on if an output stream is lost, rather than quitting ?

• Streaming .264 file while it is being encoded

  1er décembre 2017, par 123435258

  I have been digging around on the internet for a solution of my problem but I still haven’t found any solution yet.

  Let me describe my trouble.

  I have an IP camera that is connected to the another system. The system has a UDP output and transmits every data that is taken from the camera at each 20ms in real-time.

  I have written a Python code that takes the camera data from socket and turns it to a .264 video file while it is being encoded. To display it ;

  I first create a rtp server for streaming and open the URL address in VLC and wait for the second command.

  ffmpeg -i rtp://127.0.0.1:1234 -c copy -f flv rtp://127.0.0.1:1234/PSIA/Streaming/channels/2?videoCodecType=H.264

  Then I give this second command as soon as I run my Python code.

  ffmpeg -re -i C:\Python27\myVideo.264 -c copy -f rtp_mpegts rtp://127.0.0.1:1234 -c copy -f flv 

  What I would like to do is to display the video at real-time with 3 seconds delay forever. However, as mentioned above, the system gives the data at every each 20ms and ffmpeg can’t find the key frames to play the video at real-time at such a speed. I can display the video for 30 seconds with 5 seconds delay, then video turns into images in every 1s which is not a continuous video and which is not I want.

  Any help would be appreciated. Thanks in advance !