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• avutil/frame : Fix direct pointer compare between different array

  11 février, par Zhao Zhili

  avutil/frame : Fix direct pointer compare between different array
  Signed-off-by : Zhao Zhili <zhilizhao@tencent.com>
  

  • [DH] libavutil/frame.c

• illegal text-relocoation (direct reference) to (global,weak) for architecture i386

  7 janvier 2015, par OrangeDog

  Searching about shows this error in a number of mailing lists, but neither a general solution nor explanation is forthcoming.

  What does illegal text-relocoation (direct reference) to (global,weak) mean and how can it be resolved.

  Specifically, I have built ffmpeg-2.5.2 using this script. When building XCode tests that use it, there is the following error :

  ld: illegal text-relocoation (direct reference) to (global,weak)
  
      _ff_h264_cabac_tables in <...>/myLib.a(cabac.o)
  
      from _ff_h264_decode_mb_cabac in <...>/myLib.a(h264_cabac.o)
  
      for architecture i386

  Does this require compiler/linker options to fix, or some kind of code change ?

• 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...