Recherche avancée

Sur d’autres sites (7864)

• experiencing memory leakage issues before doing video encoding of images

  2 octobre 2012, par AndroidGeek

  We are building up Android 3D Animation App. We have quite a few (close to 1000) images.

  This is taking time, as we are having memory leakages and next step is to video encoding with ffpmpeg.

  Steps which are taken from our side :

  1. Capture Images identified for encoding
  2. Save them in cache or buffer
  3. Exercise the video encoding option on these images using NDK or Command Line Arguments with FFmpeg
  4. Append Audio to encoded video

  We are experiencing difficulties in second step and this is becoming memory overhead issue. We are using arrays (or hash maps), as mentioned earlier there have been quite a sizable number of images for this video encoding exercise.

• Possible bug in OpenCV2.4 capturing frames from video

  23 septembre 2013, par Jav_Rock

  Could it be that there is a bug in OpenCV2.4 highgui for capturing frames from video in windows ?

  I installed both the precompiled libraries, the ones compiled by me, I can compile everything perfectly and I can run my programs if

  they are image based. The problem is only for videos. OpenCV crashes in this function always :

   virtual IplImage* retrieveFrame(int)
  
      {
  
          unsigned char* data = 0;
  
          int step=0, width=0, height=0, cn=0;
  
  
  
          if(!ffmpegCapture ||
  
             !icvRetrieveFrame_FFMPEG_p(ffmpegCapture,&data,&step,&width,&height,&cn)) <-------CRASHES HERE
  
             return 0;
  
          cvInitImageHeader(&frame, cvSize(width, height), 8, cn);
  
          cvSetData(&frame, data, step);
  
          return &frame;
  
      }

  This is inside the class cap_ffmpeg.cpp and is called by VideoCapture.

  I tried versions 2.4.2 and 2.4.9. My programes were working finde with opencv2

  ---

  More information

  • Windows 7

  • Build the projects with cmake (important as it could be that cmake is not building/finding the right codecs)

  • VisualStudio 9 2008

  • OpenCV 2.4.2

  EDIT

  It looks like it is actually a bug, so, how can I solve this problem and change my code to be able to read avi files ?

• How to live stream from Windows 10 app to Youtube ?

  12 août 2015, par Boland

  I’m playing around with the YouTube Live Stream API. That’s working fine so far, but the next step is to stream the web cam data to YouTube via RTMP.

  In the (excellent) documentation at Google Dev, it outlines the Life of a Broadcast. However, all steps are documented in detail, except the step I’m interested in :

  Step 3.2 : Start your video

  Start transmitting video on your video stream.

  I was able to use Open Broadcasting Software to stream to a manually created YouTube Live Event, but I have no idea how to do it from my Windows 10 App. I’ve looked at the MediaElement class, and was able to capture the web cam preview in my app. But I can only find methods to save as a file.

  Also found information about FFMPEG, which should probably be able to do the job, but I cannot find a library / DLL to use FFMPEG in my App.

  I just need some guidance where to look next, because now I’m just clueless what to do.

  /edit : I came across MPlatform SDK, which sounds exactly what I want, but it costs $5000.... Not for a hobby :(