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• Streaming a video with serial port [on hold]

  23 août 2019, par kanki66

  I need an application which is streaming an video recorded by an webcam over the serial port in c#

  I opened an port and can send some data over the port. I have access to the webcam and have an picture/video on the screen. For the webcam part i used this tutorial :
  https://en.code-bude.net/2013/01/02/how-to-easily-record-from-a-webcam-in-c/

  void videoSource_NewFrame(object sender, AForge.Video.NewFrameEventArgs eventArgs)
  
  {
  
    //Cast the frame as Bitmap object and don't forget to use ".Clone()" otherwise
  
    //you'll probably get access violation exceptions
  
    pictureBoxVideo.BackgroundImage = (Bitmap)eventArgs.Frame.Clone();
  
  }

  How can i convert now this to an video as small as possible and send it over the serial port, without saving the video like directly to the serial port ?

  Thank you very much for the help

• libopenjpegenc : fix out-of-bounds reads when filling the edges

  13 octobre 2016, par Andreas Cadhalpun

  libopenjpegenc : fix out-of-bounds reads when filling the edges
  The calculation of width/height should round up, not round down to
  
  prevent setting width or height to 0.
  Also image->comps[compno].w is unsigned (at least in openjpeg2), so the
  
  calculation could silently wrap around without the explicit cast to int.
  Reviewed-by : Michael Bradshaw <mjbshaw@gmail.com>
  
  Reviewed-by : Michael Niedermayer <michael@niedermayer.cc>
  
  Signed-off-by : Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
  

  • [DH] libavcodec/libopenjpegenc.c

• SDL2.0 Alternative for SDL_Overlay

  2 février 2017, par Josh

  So I’ve been trying to go through the following tutorial on ffmpeg : http://dranger.com/ffmpeg/tutorial02.html

  However, when I try to compile using gcc, I get the following output :

  root:/Users/mbrodeur/Downloads/HACKATHON CONTENT/Tutorials-> gcc -o tutorial02 tutorial02.c -lavutil -lavformat -lavcodec -lz -lavutil -lm -lswscale -D_THREAD_SAFE -lSDL2
  
  tutorial02.c: In function ‘main’:
  
  tutorial02.c:41: error: ‘SDL_Overlay’ undeclared (first use in this function)
  
  tutorial02.c:41: error: (Each undeclared identifier is reported only once
  
  tutorial02.c:41: error: for each function it appears in.)
  
  tutorial02.c:41: error: ‘bmp’ undeclared (first use in this function)
  
  tutorial02.c:98: warning: assignment makes pointer from integer without a cast
  
  tutorial02.c:110: error: ‘SDL_YV12_OVERLAY’ undeclared (first use in this function)

  Now, I read that SDL_Overlay is no longer used in SDL2, so therein lies the problem. I’ve been poking around, but can’t seem to find anything helpful. Is there a replacement for SDL_Overlay ? Is it necessary ?

  SDL_Overlay is used in the following context :

  SDL_Overlay     *bmp;
  
  bmp = SDL_CreateYUVOverlay(pCodecCtx->width, pCodecCtx->height,
  
                         SDL_YV12_OVERLAY, screen);