Recherche avancée

Sur d’autres sites (5951)

• Use FFmpeg to combine fdshow audio capture with still image

  11 mars 2016, par Shawn T

  On windows I am trying to capture direct show audio and combine with a still image. I have come up with the following command :

  ffmpeg -f dshow  -i audio="Microphone (Conexant SmartAudio HD)" -loop 1 -i black2.png -b:a 30k -ac 1 -acodec libfdk_aac -vcodec libx264 -b:v 60k -shortest test.mp4

  This nearly works, a video with image and audio are produced but the video output is created at a much faster rate that the captured audio. So if the audio is capturing for 1 minute a 5 minute video is produced instead of 1 minute. The audio plays for the 1st minute and there is no audio for the remaining 4 minutes, The images displays through out video.
  Any help appreciated, Thank you.

• FFmpeg memory leak

  10 septembre 2015, par Spamdark

  I have developed just a simple library modifing a library that I found on the internet.

  What scares me, is that, when I play an avi, it plays and free the memory when the video ends, but when I play the video, it’s like a memory leak ! It grows to 138mb although the video has ended and the FreeAll method (A function that deletes the context, etc...) has been called.

  Here is the code of the method that is causing the memory leak :

  int VideoGL::NextVideoFrame(){
  
  int frameDone = 0;
  
  int result = 0;
  
  double pts = 0;
  
  
  
  if(!this->ended){
  
  
  
  if (!_started) return 0;
  
  AVPacket* packet;
  
  
  
  // Get the number of milliseconds passed and see if we should display a new frame
  
  int64_t msPassed = (1000 * (clock() - _baseTime)) / CLOCKS_PER_SEC;
  
  if (msPassed >= _currentPts)
  
  {
  
      // If this is not the current frame, copy it to the buffer
  
      if (_currentFramePts != _currentPts){
  
          _currentFramePts = _currentPts;
  
          memcpy(buffer_a,buffer, 3 * _codec_context_video->width * _codec_context_video->height);
  
          result = 1;
  
      }
  
  
  
      // Try to load a new frame from the video packet queue
  
      bool goodop=false;
  
      AVFrame *_n_frame = avcodec_alloc_frame();
  
      while (!frameDone && (packet = this->DEQUEUE(VIDEO)) != NULL)
  
      {
  
          if (packet == (AVPacket*)-1) return -1;
  
  
  
          goodop=true;
  
  
  
          _s_pts = packet->pts;
  
          avcodec_decode_video2(_codec_context_video, _n_frame, &frameDone, packet);
  
          av_free_packet(packet);
  
  
  
          if (packet->dts == AV_NOPTS_VALUE)
  
          {
  
              if (_n_frame->opaque && *(uint64_t*)_n_frame->opaque != AV_NOPTS_VALUE) pts = (double) *(uint64_t*)_n_frame->opaque;
  
              else pts = 0;
  
          }
  
          else pts = (double) packet->dts;
  
  
  
          pts *= av_q2d(_codec_context_video->time_base);
  
  
  
      }
  
  
  
      if (frameDone)
  
      {
  
          // if a frame was loaded scale it to the current texture frame buffer, but also set the pts so that it won't be copied to the texture until it's time
  
          sws_scale(sws_ctx,_n_frame->data, _n_frame->linesize, 0, _codec_context_video->height, _rgb_frame->data, _rgb_frame->linesize);
  
  
  
  
  
          double nts = 1.0/av_q2d(_codec_context_video->time_base);
  
          _currentPts = (uint64_t) (pts*nts);
  
  
  
      }
  
  
  
      avcodec_free_frame(&_n_frame);
  
      av_free(_n_frame);
  
  
  
      if(!goodop){
  
          ended=true;
  
      }
  
  }
  
  }
  
  
  
  return result;
  
  }

  I’ll be waiting for answers, thanks.

• avcodec/cfhd : Add support for 12-bit RGBA.

  27 février 2016, par Kieran Kunhya

  avcodec/cfhd : Add support for 12-bit RGBA.
  Plays all known samples
  

  • [DH] libavcodec/cfhd.c