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• My (FFMPEG issue ) RTMP server(freebsd) wont let me hear video when I play a huge file over the server itself :/

  19 avril 2021, par Engi Gang

  Hey my name is Alisha from Norway im trying to get my RTMP server working the thing is that it works just fine but I just cant stream over it with ffmpeg I can stream to it on OBS and it works fine, but I am trying to a website where people could watch old public domain movies from the 1950 some of the films are actually pretty big lol.... anyways I detailed bellow more

  


  rm -rf /mnt/hls/loool && ffmpeg -re -i "$file" -c:v libx264 -c:a aac -b:v 300k -b:a 95k -f flv -flvflags no_duration_filesize rtmp ://lambright.xyz:1935/live/loool

  


  any work around I literally cant play the audio :( I can only hear (my source file is an MKV and 3gb )

  


  Note I had a smaller mp4 file and it did played the audio, the video isnt even playable in chrome but on VLC it is, but only a small file worked fine... its fine when I stream from my pc, but whats the point I am trying to set up my vintage 1950 serverbox :') trying to build a nice website where users could watch neat and decent old movies that are public domain if you wonder :/

  


  Another note when I am trying to play it on my iphone safari browser it does actually play parts but audio is super corrupted like you hear the audio sometimes :((

  


  rtmp {
    server {
        listen 1935; # Listen on standard RTMP port
        chunk_size 4000;

        application live {
            allow play all;
            live on;
            record off;
            hls on;
            hls_nested on;
            hls_path /mnt/hls/;
            hls_fragment 2s;
        }
        
    }
}


  


• Open USB camera with OpenCV and stream to rtsp server

  12 septembre 2017, par user2594166

  I got a Logitech C920 camera connected via USB to a NVIDIA TX1. I am trying to both stream the camera feed over rtsp to a server while doing some computer vision in OpenCV. I managed to read H264 video from the usb camera in Opencv

  #include <iostream>
  
  #include "opencv/cv.h"
  
  #include <opencv2></opencv2>opencv.hpp>
  
  #include "opencv/highgui.h"
  
  
  
  using namespace cv;
  
  using namespace std;
  
  
  
  int main()
  
  {
  
      Mat img;
  
      VideoCapture cap;
  
      int heightCamera = 720;
  
      int widthCamera = 1280;
  
  
  
      // Start video capture port 0
  
      cap.open(0);
  
  
  
  
  
      // Check if we succeeded
  
      if (!cap.isOpened())
  
      {
  
          cout &lt;&lt; "Unable to open camera" &lt;&lt; endl;
  
          return -1;
  
      }
  
      // Set frame width and height
  
      cap.set(CV_CAP_PROP_FRAME_WIDTH, widthCamera);
  
      cap.set(CV_CAP_PROP_FRAME_HEIGHT, heightCamera);
  
      cap.set(CV_CAP_PROP_FOURCC, CV_FOURCC('X','2','6','4'));
  
  
  
      // Set camera FPS
  
      cap.set(CV_CAP_PROP_FPS, 30);
  
  
  
      while (true)
  
      {
  
          // Copy the current frame to an image
  
          cap >> img;
  
  
  
          // Show video streams
  
          imshow("Video stream", img);
  
  
  
          waitKey(1);
  
      }
  
  
  
      // Release video stream
  
      cap.release();
  
  
  
      return 0;
  
  }
  
  </iostream>

  I also have streamed the USB camera to a rtsp server by using ffmpeg :
  ffmpeg -f v4l2 -input_format h264 -timestamps abs -video_size hd720 -i /dev/video0 -c:v copy -c:a none -f rtsp rtsp://10.52.9.104:45002/cameraTx1

  I tried to google how to combine this two functions, i.e. open usb camera in openCV and use openCV to stream H264 rtsp video. However, all I can find is people trying to open rtsp stream in openCV.

  Have anyone successfully stream H264 rtsp video using openCV with ffmpeg ?

  Best regards
  Sondre

• opencv V3 mixing shared and non shared

  31 décembre 2015, par Kellerspeicher

  The current stable (V3.0.0) and unstable (V3.1.0) version of openCV is mixing shared and non shared libraries if compiled on an Ubuntu 14.04.3 LTS.

  Linking CXX shared library ../../lib/libopencv_videoio.so
  
  /usr/bin/ld: /usr/local/lib/libavcodec.a(avpacket.o): relocation R_X86_64_32 against `.rodata.str1.1' can not be used when making a shared object; recompile with -fPIC
  
  /usr/local/lib/libavcodec.a: error adding symbols: Bad value
  
  collect2: error: ld returned 1 exit status
  
  make[2]: *** [lib/libopencv_videoio.so.3.1.0] Error 1
  
  make[1]: *** [modules/videoio/CMakeFiles/opencv_videoio.dir/all] Error 2
  
  make: *** [all] Error 2

  Trying to create libopencv_videoio.so using libavcodec.a seems to be the problem. There is a bug report about that, but it is only giving the advice to check if libavcodec.so is installed (which is) and a workaround to use -DBUILD_SHARED_LIBS=OFF to prevent creation of shared libraries. Does anyone knows the reason for this problem. The openCV people just state the Ubuntu packaged ffmpeg library to be not correct. Any idea ?

  The problem seems to be old. I just found a very similar question not answered but commented with the advice of compiling ffmpeg with ./configure --enable-shared. But there is already a shared library /usr/lib/x86_64-linux-gnu/libavcodec.so which obviously is not found. I am not a cmake expert but couldn’t it be a problem of a miss leaded build process ?