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• FFmpeg - capture a rtsp stream and re-stream it to another rtsp-server

  15 mars 2021, par moster67

  I want to capture a Rtsp-stream from a Live-CAM which I then want to re-stream to another Rtsp-server.
Basically, my computer will work as a relay-server using FFMpeg.

  


  I have tried this temporary command but I cannot get it working i.e.

  


  ffmpeg.exe -i rtsp://InputIPAddress:554/mystream -preset medium -vcodec libx264 -tune zerolatency -f rtsp -rtsp_transport tcp rtsp://localhost:8554/mysecondstream


  


  I have then tried, for testing purposes, using FFplay to watch the stream from localhost as follows :

  


  ffplay rtsp://localhost:8554/mysecondstream


  


  but no luck.

  


  Anyone who can help me out ? Thanks.

  


• ffmpeg latency even on 127.0.0.1 udp

  3 juin 2016, par KKKk

  I’ve got a problem with ffmpeg video stream(udp). Thing is I’ve got about 2 sec delay on live stream even on loopback(!).

  I use those parameters :

  ffmpeg -f dshow -i video="screen-capture-recorder" -vcodec libx264 -preset ultrafast -tune zerolatency -r 10 -maxrate 750k -bufsize 3000k -f mpegts udp://127.0.0.1:1234

  I tried also those :

  ffmpeg -f dshow -i video="screen-capture-recorder" -framerate 30 -c:v libx264 -preset veryfast -tune zerolatency -pix_fmt yuv444p -x264opts crf=20:vbv-maxrate=3000:vbv-bufsize=100:intra-refresh=1:slice-max-size=1500:keyint=30:ref=1 -f mpegts udp://127.0.0.1:1234

  but it’s even worse.
  I tried to raise framerate, or decrease GOP value, but it didn’t help me. Any ideas ? Maybe I did some basic mistakes since I’m beginner yet..
  (probesize at 32 didn’t help me too).

• Reduce relative latency on ffmpeg video mosaic filter

  23 juin 2016, par Luke E

  I’m working a Google Cardboard project which involves a 3D video captured from two webcams being combined into a single stream by ffmpeg and then streamed to an android phone. I’ve created a custom complex filter to do everything I need in ffmpeg, however, I’ve found that the latency between the videos is very high — there’s is almost a second of lag between the left video and the right. Does anyone know if there’s a way to synchronize the two ? Even if it means just delaying the faster stream. Thanks a ton, and below is the command I’m using.

  ffmpeg -f dshow -video_device_number 0 -i video="Logitech HD Pro Webcam C920" -f dshow -video_device_number 1 -i video="Logitech HD Pro Webcam C920" -filter_complex "[0:v]setpts=PTS-STARTPTS[c];[1:v]setpts=PTS-STARTPTS[d];[c]crop=320:480[b];[d]crop=320:480[int3];[b]transpose=2[a];[int3]transpose=1[int2];[a]pad=iw*2:ih[int]; [int][int2]overlay=W/2:0[vid]" -map [vid] -pix_fmt yuv420p -r 100 -an -vcodec libx264 -preset ultrafast -tune zerolatency -threads 8 -thread_type slice -f mpegts udp://192.168.43.1:1234

  P.S I apologize for the odd complex filter formatting, very early one morning I decided to re-order it to see if I could somehow synchronize the video streams that way, but obviously that was a stupid idea :) And I believe the PTS commands only do something useful for video files, but I left them in anyway.