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• Why does ffmpeg stop recording at midnight ?

  22 septembre 2019, par peter

  I have a shellscript like this under Kubuntu 19.10,

  #!/bin/bash
  
  
  
  while true
  
  do
  
      FILE=/media/petermc/Security5/Camera2/Camera2_.mp4  
  
      FILE=${FILE%.*}`date +%Y-%m-%d_%H-%M-%S-%N`.${FILE#*.}
  
      echo $FILE
  
  
  
      ffmpeg -rtsp_transport tcp -t 00:15:00 -i rtsp://*user*:*password*@192.168.1.60:554/ch02/0 -c copy -map 0 $FILE
  
  done

  It records files like this,

  Camera2_2019-09-21_23-36-57-874602376.mp4
  
  Camera2_2019-09-21_23-51-57-876639147.mp4

  Basically recording 15 minutes at a time from the RTSP feed, then starting a new file.

  However it stops working at midnight, the last few lines from the log file are this,

  frame= 3987 fps= 13 q=-1.0 size=  117760kB time=00:05:06.51 bitrate=3147.3kbits/s speed=1.01x    
  
  frame= 3994 fps= 13 q=-1.0 size=  118016kB time=00:05:07.07 bitrate=3148.4kbits/s speed=1.01x    
  
  frame= 4001 fps= 13 q=-1.0 size=  118016kB time=00:05:07.59 bitrate=3143.1kbits/s speed=1.01x    
  
  frame= 4008 fps= 13 q=-1.0 size=  118272kB time=00:05:08.11 bitrate=3144.6kbits/s speed=1.01x 

  So there doesn’t seem to be any error, it stops recording at 5 minutes into the last file with no error.

  Another piece of information is that I have 6 cameras, and 4 stopped recording, the ones connected to a DVR. I have a couple of IP cameras and they kept recording.

  What could be the cause of this ? Plus, what else could I do to work around this or diagnose this ?

  UPDATE :

  I believe the issue is because the DVR has a maintenance setup to restart once at week at midnight. If this is what happened, is there any way I can configure ffmpeg to restart if it has lost the stream ?

• Gstreamer : Hauppauge HD PVR and Multi-video file output

  7 juin 2014, par user3716978

  I have very specific requirements for a Gstreamer pipeline that I can’t seem to create. I’m running Linux Mint Mate 14 (Nadia).

  I have an HD PVR, which records in MPEG TS. It presents, as its interface, a V4L2 device at /dev/video0. What I need is to somehow have it output the captured video to multiple files. That is, like dvgrab’s autosplit, it would output, say, 1800 frames, then create a new output file, then capture another 1800, and on and on.

  I’ve tried numerous methods. First, using multifilesink with the keyframe next-file option does what I want, but it doesn’t seem to add stream headers to the segment files, so that they cannot play properly and/or are missing their initial keyframe.

  I’ve tried limiting each individual capture length using num-buffers, and just restarting the capture after the previous one ends. This works for maybe 30 or 40 files but all the switching on and off eventually locks up the HD PVR, and it has to be power-cycled.

  I could also have it dump images to the disk and work with the individual frames, but this is very slow with MPEG TS since it has to demux, decode, and reencode every frame. It eats up 100% cpu and drops about 60% of the frames on my computer.

  ffmpeg doesn’t work, because the HD PVR driver doesn’t support ioctl. I can’t seem to get mencoder to stream it this way either, but maybe it’s possible ?

  What I need is to :

  • Have a single capture stream, to avoid pissing off the HD PVR
  • Have it split the stream into multiple files which can be individually analyzed
  • Have those multiple files be valid videos
  • Not eat up 100% of my CPU (although high utilization is ok, it needs to run at full speed). Since the stream is 1920x1080x60fps, anything to do with reencoding won’t work. It pretty much needs to be a stream copy.

  Thank you

• FFMPEG MemoryAccessException on cleanup

  16 décembre 2015, par Casey Price

  I’ve written an application that records from various USB webcams using ffmpeg, however if I unplug a camera while ffmpeg is in the middle of recording I get memory access exceptions when running the following cleanup code.

  if (packet.data != 0)
  
      av_packet_unref(&packet);
  
  
  
  if (frame != 0)
  
      av_frame_free(&frame);
  
  
  
  
  
  if (ifmt_ctx != NULL)
  
  {
  
      for (i = 0; i < ifmt_ctx->nb_streams; i++) {
  
          avcodec_close(ifmt_ctx->streams[i]->codec);
  
          if (ofmt_ctx && ofmt_ctx->nb_streams > i && ofmt_ctx->streams[i] && ofmt_ctx->streams[i]->codec)
  
              avcodec_close(ofmt_ctx->streams[i]->codec);
  
          if (filter_ctx && filter_ctx[i].filter_graph)
  
              avfilter_graph_free(&filter_ctx[i].filter_graph);
  
      }
  
  }
  
  
  
  if (filter_ctx != NULL && filter_ctx->buffersink_ctx != NULL && filter_ctx->buffersrc_ctx != NULL && filter_ctx->filter_graph != NULL)
  
      av_freep(&filter_ctx);
  
  
  
  if (ifmt_ctx != 0)
  
      avformat_close_input(&ifmt_ctx);
  
  
  
  if (ofmt_ctx && ofmt_ctx->oformat != NULL && !(ofmt_ctx->oformat->flags & AVFMT_NOFILE))
  
      avio_closep(&ofmt_ctx->pb);
  
  
  
  if (ofmt_ctx != 0 && ofmt_ctx->oformat != 0)
  
      avformat_free_context(ofmt_ctx);

  Specifically it crashes on

  if (filter_ctx != NULL && filter_ctx->buffersink_ctx != NULL && filter_ctx->buffersrc_ctx != NULL && filter_ctx->filter_graph != NULL)
  
          av_freep(&filter_ctx);

  With a Null Reference exception on the if check sometimes. Other times the code runs fine and doesn’t crash. I’ve also tried

  if (filter_ctx)
  
      av_free(filter_ctx);

  But this gives me a MemoryAccessException instead of a null reference, I’m guessing something on another thread is changing my data while cleaning up, however all of my variables are are not shared with any other thread.

  Does anyone know whats going on ?