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• Run 2 exec command in for loop with time interval of 30 seconds using TCL and FFMPEG

  29 novembre 2017, par M. D. P

  i want to Run 2 exec command in for loop with time interval of 30 seconds using TCL and FFMPEG

  my exec command for image is :

  exec ffmpeg -f dshow -benchmark -i video="Integrated Webcam" -s 1280x720 c:/test/sample_image%d.jpg

  my exec command for video is :

  exec ffmpeg -f dshow -benchmark -i video="Integrated Webcam" -s 1280x720 c:/test/sample_video%d.avi

  i want my code to be like this :

  proc a {} { 
  
  
  
  set a 1
  
  
  
  while {$a < 10} {
  
  
  
  after 3000
  
  
  
  exec ffmpeg -f dshow -benchmark -i "video=Integrated Webcam" -s 1280x720 c:/test/sample_image.avi
  
  
  
  after 3000
  
  
  
  exec ffmpeg -f dshow -t 00:00:30 -benchmark -i "video=Integrated Webcam" -s 1280x720 c:/test/sample_video.avi
  
  
  
  incr a
  
  
  
  }
  
  
  
  }
  
  a

  problem here is, after completion of first exec command, it stops its execution. that is it captures the image and stops its execution.

  I also want that this process of capturing image and video should work in loop (while or foreach).

  i have my present working code which execute only one exec command, that to only one. so i want this two exec command to run after one another in loop.

  error report for above program :

  % source c:/other/a/d.tcl
  
  
  
  ffmpeg version N-89212-ga60b2425c3 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 7.2.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-cuda --enable-cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth --enable-libmfx
  
    libavutil      56.  2.100 / 56.  2.100
  
    libavcodec     58.  3.105 / 58.  3.105
  
    libavformat    58.  2.102 / 58.  2.102
  
    libavdevice    58.  0.100 / 58.  0.100
  
    libavfilter     7.  2.102 /  7.  2.102
  
    libswscale      5.  0.101 /  5.  0.101
  
    libswresample   3.  0.101 /  3.  0.101
  
    libpostproc    55.  0.100 / 55.  0.100
  
  Input #0, dshow, from 'video=Logitech HD Webcam C525':
  
    Duration: N/A, start: 90055.057000, bitrate: N/A
  
      Stream #0:0: Video: rawvideo, bgr24, 1280x720, 30 fps, 30 tbr, 10000k tbn, 10000k tbc
  
  File 'c:/test/sample_20171128_111245.jpg' already exists. Overwrite ? [y/N] [dshow @ 052d4ac0] real-time buffer [Logitech HD Webcam C525] [video input] too full or near too full (181% of size: 3041280 [rtbufsize parameter])! frame dropped!
  
      Last message repeated 886 times
  
  Not overwriting - exiting
  
  bench: maxrss=50856kB
  
  [dshow @ 052d4ac0] real-time buffer [Logitech HD Webcam C525] [video input] too full or near too full (181% of size: 3041280 [rtbufsize parameter])! frame dropped!
  
      Last message repeated 1 times
  
  %

  please provide me the code as answer which will work for above problem.

• Get image from direct show device [duplicate]

  13 août 2014, par user2663781

  This question already has an answer here :

  • Capturing image from webcam in java ?
    
    15 answers
    

  I want to get image from direct show device in Java but I can’t find a good solution for it.
  My device is screen-capture-recorder which is easy to get with ffmpeg, so my first idea was to use Xuggler.
  I tried this code :

  String driverName = "dshow";
  
  String deviceName= "screen-capture-recorder";
  
  // Let's make sure that we can actually convert video pixel formats.
  
  if (!IVideoResampler.isSupported(IVideoResampler.Feature.FEATURE_COLORSPACECONVERSION))
  
            throw new RuntimeException("you must install the GPL version of Xuggler (with IVideoResampler support) for this demo to work");
  
  // Create a Xuggler container object
  
  IContainer container = IContainer.make();
  
  // Tell Xuggler about the device format
  
  IContainerFormat format = IContainerFormat.make();
  
  if (format.setInputFormat(driverName) < 0)
  
            throw new IllegalArgumentException("couldn't open webcam device: " + driverName);
  
  // devices, unlike most files, need to have parameters set in order
  
  // for Xuggler to know how to configure them, for a webcam, these
  
  // parameters make sense
  
  IMetaData params = IMetaData.make();
  
  params.setValue("framerate", "30/1");
  
  params.setValue("video_size", "320x240");
  
  
  
  // Open up the container
  
  int retval = container.open(deviceName, IContainer.Type.READ, format,
  
  false, true, params, null);

  But when I try to open the device (by his device name) it is not working :
  0 [main] ERROR org.ffmpeg - [dshow @ 05168820] Malformed dshow input string.
  0 [main] DEBUG com.xuggle.xuggler - Could not open output url : screen-capture-recorder (../../../../../../../csrc/com/xuggle/xuggler/Container.cpp:436)
  Exception in thread "main" java.lang.IllegalArgumentException : could not open file : screen-capture-recorder ; Error : Input/output error
  at DisplayWebcamVideo.main(DisplayWebcamVideo.java:99)
  Java Result : 1

  After searching a bit I found DSJ, but it is for non-commercial use only and we need a registry version, so impossible to use for me.

  I also found LTI-CIVIL but it could not detect the "screen-capture-recorder".
  I tried FMJ and JMF but it does not find the device too.

  I tried VLCj but the container with the video must be open if I want to get image and it is not what I need.

  I tried webcam-recorder (github.sarxos.webcam), it detects the device but i got this error when I try to open it :

  #
  
  # A fatal error has been detected by the Java Runtime Environment:
  
  #
  
  #  EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x5faf910d, pid=2552, tid=9780
  
  #

  I am a bit stuck now, I don’t know how to solve this problem someone can help me ?
  Or give me a simple DLL that I can use through JNA to get an image from direct show device...

• Sending big packets gets Bad Address error

  30 mars 2012, par Roi

  Im writing a live webcam stream using ffmpeg and sdl on C.
  my platform is linux.

  my application is a client server based.
  The client is reading from the webcam, produce an AVPacket, then send to server.

  My problem is, that the AVPacket struct has a member named data which is approximately 600k.
  At first, i had not checked the send() return value,
  So, of course the packet had failed to send completely.

  But after I checked, the send() returns Bad Address error at the second iteration of the big packet.
  the length of the data packet must be correct because is supplied from the AVPacket struct.

  It sends 2 members of the AVPacket before, so the server is up and functional.

  The problematic section :

      int send_video_data(video_client_t *client, void* buf, int length)
  
      {
  
          int rc;
  
  
  
          while (length > 0)
  
          {
  
             if ((rc = send(client->sockfd, buf, length, 0)) == -1) {
  
                       perror("failed sending data to server");
  
                       exit(1);
  
              }
  
  
  
              length-=rc;
  
              buf+=rc;
  
          }
  
  
  
          return 0;
  
  
  
      }

  Any one got any ideas why it's not working ?
  Thanks in advanced !