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• How to properly parse the H.265 RTSP stream from the Bosch DINION IP 3000iIR (CPP7.3) camera

  5 août 2024, par Pirlo Zhang

  Description :

  


  I am trying to parse the H.265 RTSP stream from two Bosch cameras :

  


  DINION IP 3000iIR (CPP7.3), commercial model NBE-3502-AL
DINION IP 4000i IR (CPP7.3), commercial model NBE-4502-AL
These cameras are configured in the BVMS management software to stream via RTSP on port 554 with H.265 video encoding.

  


  Despite extensive testing, I am unable to properly parse the stream using :

  


  VLC software
FFmpeg software
Custom programs

  


  None of these methods seem to work. The stream does not parse correctly or is not displayed at all.

  


  We have tried various stream URLs including :

  


  rtsp ://user:password@10.177.100.xxx:554/h265/ch1/main/av_stream
rtsp ://user:password@10.177.100.xxx:554/h264/ch1/main/av_stream
rtsp ://user:password@10.177.100.xxx:554/h265/ch1/sub/av_stream
rtsp ://user:password@10.177.100.xxx:554/h264/ch1/sub/av_stream

  


  Additionally, when testing other models with BVMS configured to use H.264, we can successfully retrieve the video stream.

  


  Has anyone experienced similar issues or have any insights on how to resolve this ? Any help would be greatly appreciated.

  


• ffplay does not exit in forked child

  6 septembre 2019, par user12030145

  ffplay  -autoexit does not exit in a forked child

  I need to pipe my application (stdout) to ffplay (stdin). I do this by forking ffplay as a child and using -i pipe:0 as argument.

  #include 
  
  #include 
  
  #include <sys></sys>types.h>
  
  #include <sys></sys>wait.h>
  
  
  
  int main(int argc, const char** argv)
  
  {
  
  int tube[2];
  
  int c;
  
  FILE* f = fopen(argv[1], "rb");
  
  pid_t pid;
  
  if (argc &lt; 2) return -1;
  
  if (pipe(tube))  {
  
      perror("Pipe");
  
      return -1;
  
    }
  
  
  
  // main process cats a .mlp file to stdout, sent to a child ffplay stdin through a pipe
  
  char* const arg[] = {"-i", "pipe:0", "-f", "mlp", "-nodisp", "-autoexit", NULL};
  
  switch (pid = fork())    {
  
              case -1:
  
                  fprintf(stderr,"%s\n", "Could not launch ffplay");
  
                  break;
  
  
  
              case 0:
  
                  close(tube[1]);
  
                  dup2(tube[0], STDIN_FILENO);
  
                  execv("/usr/bin/ffplay", arg);
  
                  fprintf(stderr, "%s\n", "Runtime failure in ffplay child process");
  
                  return -2;
  
  
  
              default:
  
                  close(tube[0]);
  
                  dup2(tube[1], STDOUT_FILENO);
  
          }
  
  
  
  // Here the main process code sending the .mlp file to stdout...
  
  
  
  while ((c = fgetc(f)) != EOF) putchar(c);
  
  
  
  waitpid(pid, NULL, 0);
  
  fclose(f);
  
  
  
  // main never returns
  
  return 0;
  
  }

  The issue is that in this context, ffplay -autoexit never exits (GNU-Linux platform). In a main process, ffplay -autoexit always exits at the end of a media file.
  Is there a pure C workaround without using system, popen or scripting ?
  Is this a feature or a bug of ffplay (I cannot tell) ?

• Fastest way to extract moving dynamic crop from video using ffmpeg

  5 avril 2024, par NateW

  I'm working on an AI project that involves object detection and action recognition on roughly 30 minute videos.

  


  My pipeline is the following :

  


  

  • determine crops using object detection model

  


  • extract crops using Python and write them to disk as individual images for each frame.

  


  • use action recognition model by inputting a series of the crops.

  


  


  The models are fast but actual writing of the crops to disk is slow. Sure, using an SSD would speed it up but I'm sure ffmpeg would greatly speed it up.

  


  Some of the challenges with the crops :

  


  

  • the output size is always 128x128

  


  • the input size is variable

  


  • the crop moves on every frame

  


  


  My process for extracting crops is simple using cv2.imwrite(output_crop_path, crop) in a for loop.

  


  I've done experiments trying to use sndcommand and filter_complex. I tried this https://stackoverflow.com/a/67508233/4447761 but it outputs an image with black below the crop and the image gets wrapped around on the x axis.