Newest 'ffmpeg' Questions - Stack Overflow

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• Creating a pipe between C# and Ffmpeg

  15 décembre 2011, par John Oliver

  I have a C# program that creates a video and saves it to the disk in real-time. Instead of doing that, I want it to write it directly in a pipe connected with ffmpeg...

  The function that keeps saving the video in the disk, which I can not control, receives an IntPtr with a reference to the file.

  So, I need to create a pipe or something like that with ffmpeg, get a pointer to that, and use that pointer in the function, so that it streams the file to ffmpeg and not the disk...

  Regards, John Oliver

• How to encode video using ffmpeg-java on Android from Bitmaps ?

  15 décembre 2011, par gtcompscientist

  I am using ffmpeg-java compiled for Android to encode/decode video for my application.

  The problem that I've run into is that I am currently getting each frame as a Bitmap (just a plain android.graphics.Bitmap) and I can't figure out how to stuff that into the encoder.

  Here is the code that I am using to instantiate all the ffmpeg libraries:

      AVCodecLibrary cLibrary = AVCodecLibrary.INSTANCE;
      cLibrary.avcodec_register_all();
      cLibrary.avcodec_init();
  
      AVFormatLibrary fLibrary = AVFormatLibrary.INSTANCE;
      fLibrary.av_register_all();
  
      //AVUtilLibrary uLibrary = AVUtilLibrary.INSTANCE;
      //uLibrary.av_malloc();
  
      AVCodec pCodec = cLibrary.avcodec_find_encoder(AVCodecLibrary.CODEC_ID_H263);
      if (pCodec == null)
      {
          Logging.Log("Unable to find codec.");
          return;
      }
      Logging.Log("Found codec.");
  
  
      AVCodecContext codecCtx = cLibrary.avcodec_alloc_context();
      codecCtx.bit_rate = 64000;
      codecCtx.coded_width = VIDEO_WIDTH;
      codecCtx.coded_height = VIDEO_HEIGHT;
      codecCtx.time_base = new AVRational(1, VIDEO_FPS);
      codecCtx.pix_fmt = AVCodecLibrary.PIX_FMT_YUV420P;
      codecCtx.codec_id = AVCodecLibrary.CODEC_ID_H263;
      //codecCtx.codec_type = AVMEDIA_TYPE_VIDEO;
  
      if (cLibrary.avcodec_open(codecCtx, pCodec) < 0)
      {
          Logging.Log("Unable to open codec.");
          return;
      }
      Logging.Log("Codec opened.");
  

  This is what I want to be able to execute next:

  cLibrary.avcodec_encode_video(codecCtx, pPointer, pFrame.size(), pFrame);
  

  But, as of now, I don't know how to put the Bitmap into the right piece or if I have that setup correctly.

  A few notes about the code: - VIDEO_WIDTH = 352 - VIDEO_HEIGHT = 288 - VIDEO_FPS = 30; - I'm unsure about how pPointer and pFrame are handled.

• Anybody has any idea how this site works ? www.ivipid.com [closed]

  14 décembre 2011, par Aamir Siddique

  I am a website developer (php) and i have been given a task to develop a similar website:

  http://ivipid.com/

  I need to make an identical website and i am trying to figure out how this can be done.

  Any ideas would be highly appreciated, please advice.

  Thanks!

• FFMPEG : is there a way to keep RTSP connection alive in code ?

  14 décembre 2011, par Alex

  I'm taking frames from a RTSP connection as follows (in pseudocode):

  av_open_input_file(&avcontext)
  while(av_read_frame(&frame) > 0) {
      doSomething(frame);
      av_free_packet(frame);
  }
  

  For some reason the doSomething() function takes much time and, because of this (at least, I think so) the connection interupts - av_read_frame() returns 'eof' and the loop exits.

  When I make doSomething() shorter such interruptions do not occur.

  For some reasons I can't do doSomething() in another thread.

  Therefore, I'm interested if maybe there are some parameters to avcontext which will let me keep the connection alive or increase the timeout?

  Thank you!

• Installing faad library for ffmpeg through Homebrew on mac OS X Lion

  14 décembre 2011, par alex

  Following up with my previous question, I decided to give Ffmpeg a try and installed it on my Mac with Homebrew.

  I am now trying to follow this tutorial and use the linked script. But can't make/install the script. I first corrected a small bug (replaced CODEC_TYPE_AUDIO, CODEC_TYPE_VIDEO and PKT_FLAG_KEY with AVMEDIA_TYPE_AUDIO, AVMEDIA_TYPE_VIDEO, and AV_PKT_FLAG_KEY respectively in live_segmenter.c). But now, when I run make in the unzipped folder, I get the following warning and error messages:

  gcc -Wall -g live_segmenter.c -o live_segmenter -lavformat -lavcodec -lavutil -lbz2 -lm -lz -lfaac -lmp3lame -lx264 -lfaad -lpthread
  live_segmenter.c: In function ‘main’:
  live_segmenter.c:149: warning: ‘av_open_input_file’ is deprecated (declared at /usr/local/include/libavformat/avformat.h:1093)
  live_segmenter.c:165: warning: implicit declaration of function ‘guess_format’
  live_segmenter.c:165: warning: initialization makes pointer from integer without a cast
  live_segmenter.c:208: warning: ‘av_set_parameters’ is deprecated (declared at /usr/local/include/libavformat/avformat.h:1407)
  live_segmenter.c:214: warning: ‘dump_format’ is deprecated (declared at /usr/local/include/libavformat/avformat.h:1535)
  live_segmenter.c:232: warning: ‘url_fopen’ is deprecated (declared at /usr/local/include/libavformat/avio.h:279)
  live_segmenter.c:238: warning: ‘av_write_header’ is deprecated (declared at /usr/local/include/libavformat/avformat.h:1465)
  live_segmenter.c:283: warning: ‘put_flush_packet’ is deprecated (declared at /usr/local/include/libavformat/avio.h:293)
  live_segmenter.c:284: warning: ‘url_fclose’ is deprecated (declared at /usr/local/include/libavformat/avio.h:280)
  live_segmenter.c:289: warning: ‘url_fopen’ is deprecated (declared at /usr/local/include/libavformat/avio.h:279)
  live_segmenter.c:326: warning: ‘url_fclose’ is deprecated (declared at /usr/local/include/libavformat/avio.h:280)
  ld: library not found for -lfaad
  collect2: ld returned 1 exit status
  make: *** [all] Error 1
  

  I also downloaded the faac/faad libraries from here. When I run make in faac, it says I have nothing to install, but I can't find out how to install faad...

  Would love any help you can offer!