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• How to overlay clock with real-time in screen recording using ffmpeg for Sharex open source ?

  1er septembre 2022, par calengineer

  I currently have ShareX and using the following command but the clock with real time is not being added and the video gets considerably cut. A 30 second video turns out to be a 4 second video.

  


  -hide_banner -f dshow -thread_queue_size 1024 -rtbufsize 256M -audio_buffer_size 80 -framerate 30 -i video="screen-capture-recorder":audio="virtual-audio-capturer" -f dshow -i audio="Microphone (HyperX QuadCast S)" -filter_complex amix=inputs=2:duration=longest -vf "drawtext=fontfile=/usr/share/fonts/dejavu/DejaVuSans-Bold.ttf: \ text='%{localtime\:%T}': fontcolor=white@0.8: x=7: y=700" -c:v libx264 -r 30 -preset ultrafast -tune zerolatency -crf 28 -pix_fmt yuv420p -movflags +faststart -c:a aac -ac 2 -b:a 128k -y "output.mp4"


  


• Real-Time Buffer Too Full (FFMPEG)

  25 janvier 2018, par Nimble

  So I’ve been having this issue with ffmpeg, it has been a journey getting the hardware and command to actually do what I want, but I still have one problem.

  Sometimes when I’m recording I just start dropping frames like crazy, this can be after an hour of recording or even ten hours in... Everything will be working fine and then suddenly I’ll start dropping frames due to "real-time buffer too full or near too full". This happens regardless of how low I put the bitrate, and the buffer size is high as it will allow, eventually I’ll just start dropping frames. Almost seems like it could be like a power saving feature kicking in but it’s too inconsistent it seems. Like I said sometimes I can go 10 hours without having this issue.

  Any ideas ?

  Here is my block of code :

  ffmpeg -guess_layout_max 0 -y -f dshow -video_size 3440x1440 -rtbufsize 2147.48M -pixel_format nv12 -framerate 200 ^
  
  -i video="Video (00 Pro Capture HDMI 4K+)":audio="SPDIF/ADAT (1+2) (RME Fireface UC)" -map 0:0,0:1 -map 0:1 ^
  
  -preset: llhp -codec:v h264_nvenc -pix_fmt nv12 -b:v 250M -maxrate:v 250M -minrate:v 250M -bufsize:v 250M -b:a 320k ^
  
  -ac 2 -r 100 -async 1 -vsync 1 -segment_time 600 -segment_wrap 9 -f segment C:\Users\djcim\Videos\PC\PC%02d.mp4 ^
  
  -guess_layout_max 0 -f dshow -rtbufsize 2000M -i audio="Analog (3+4) (RME Fireface UC)" -map 1:0 -b:a 320k -ac 2 ^
  
  -af "adelay=200|200" -segment_time 600 -segment_wrap 9 -f segment C:\Users\djcim\Videos\PC\Voices\Theirs\TPC%02d.wav ^
  
  -guess_layout_max 0 -f dshow -rtbufsize 2000M -i audio="Analog (5+6) (RME Fireface UC)" -map 2:0 -b:a 320k -ac 2 ^
  
  -af "adelay=825|825" -segment_time 600 -segment_wrap 9 -f segment C:\Users\djcim\Videos\PC\Voices\Mine\MPC%02d.wav

  Here is the error, it repeated around 300 times before locking up ffmpeg forcing my to quit before starting the recording again :

  [dshow @ 0000019a596bdcc0] real-time buffer [Video (00 Pro Capture HDMI 4K+)] [video input] too full or near too full (62% of size: 2147480000 [rtbufsize parameter])! frame dropped!

• libav : How to clear real-time buffer ?

  29 novembre 2018, par user67

  Here’s the c++ code that I’m using to access my webcam.

  int Camera::Init(char* file_name,
  
                  char* device_name,
  
                  char* format,
  
                  char* resolution,
  
                  char* frame_rate,
  
                  char* pixel_format)
  
  {
  
      av_log(NULL, AV_LOG_INFO, "---INIT STARTED\n");
  
      avdevice_register_all();
  
      av_register_all();
  
  
  
      AVDictionary* properties_collection = NULL;
  
      av_dict_set(&properties_collection, "f", format, NULL);
  
      av_dict_set(&properties_collection, "video_size", resolution, NULL);
  
      av_dict_set(&properties_collection, "framerate", frame_rate, NULL);
  
      av_dict_set(&properties_collection, "pix_fmt", pixel_format, NULL);
  
      AVInputFormat *input_format = av_find_input_format("dshow");
  
      char command_line[256];
  
      sprintf(command_line, "video=%s", device_name);
  
      AVFormatContext *input_context = avformat_alloc_context();
  
      //input_context->flags |= AVFMT_FLAG_NOBUFFER;      //DOESN'T HELP
  
      //input_context->max_picture_buffer = 0;            //ERR
  
  
  
      int err_code = 0;
  
      err_code = avformat_open_input(&input_context,
  
                                      command_line,
  
                                      input_format,
  
                                      &properties_collection);
  
      int i = 0;
  
      while (i++ < 30)
  
      {
  
          Sleep(1000);
  
          //avformat_flush(input_context); //DOESN'T HELP
  
          //av_free(input_context); //ERR
  
      }
  
      system("pause");
  
      return 0;
  
  }

  Right after "avformat_open_input()" it starts reading frames to some internal buffer without me even calling "av_read_frame()".
  After about 10 seconds it start’s giving me error messages :

  [dshow @ 0014ed40] real-time buffer [VirtualBox Webcam - FULL HD 1080P Webcam] [video input] 
  
  too full or near too full (62% of size: 3041280 [rtbufsize parameter])! 
  
  frame dropped!
  
  ...
  
  ...
  
  ...
  
  [dshow @ 0014ed40] real-time buffer [VirtualBox Webcam - FULL HD 1080P Webcam] [video input] 
  
  too full or near too full (100% of size: 3041280 [rtbufsize parameter])! 
  
  frame dropped!

  How to clear this buffer or avoid using it ?

  Thanks in advance.

  P.S.Please pardon my english.

  P.P.S.Have a good day.