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• FFMPG crop video, add overlay image and change sound in one command

  8 mai 2015, par laurentiugh

  I am developing an (android) app witch records a video then needs to crop video, add overlay image and change sound. The problem is that i am doing them sequentially and this takes very long time (like 5min for a 20s video).

  I need help to combine them into one command or optimize to be as fast as possible. The commands i am using :

  1. Crop video to 480x480 :
     ffmpeg -i videoPath -vf scale=480:ih*480/iw -vf crop=480:480:0:0 -c:a copy -strict experimental outPath

  2. Add the image overlay :
     ffmpeg -i videoPath -i imagePath -c:a copy -filter_complex overlay=0:0 -strict experimental

  3. change the sound (merge video with another sound file) :
     ffmpeg -i videoPath) -i audioPath) -vf transpose=2 -c:a aac -strict experimental -map 0:v:0 -map 1:a:0

  Thanks.

• Revision 91518 : Notice PHP en moins : lock et unlock n’ont pas de $value ou $ttl.

  28 août 2015, par marcimat@… — Log

  Notice PHP en moins : lock et unlock n’ont pas de $value ou $ttl.

• Can't lock std::mutex again

  16 juillet 2017, par user3567631

  Sorry for poor English.
  I referenced this FFMPEG to make ffmpeg decoder.
  The open will block, I make it run in detach thread.
  I added std::unique_lock to lock mutex in beginning of open.

  bool FFmpegWrapper::open(std::string strFileName)
  
  {
  
  std::unique_lock lock(g_Mutex, std::try_to_lock);
  
  
  
  m_pFormatContext = avformat_alloc_context();
  
  m_pFormatContext->probesize = 4 * 1024 *100;
  
  m_pFormatContext->max_analyze_duration = 0 * AV_TIME_BASE;
  
  
  
  if (avformat_open_input(&m_pFormatContext, strFileName.c_str(), nullptr, nullptr) != 0)
  
      return false; 
  
  
  
  if (avformat_find_stream_info(m_pFormatContext, NULL) < 0)
  
      return false; 
  
  
  
  m_iVideoStream = m_iAudioStream = -1;
  
  for (unsigned int i = 0; i < m_pFormatContext->nb_streams; i++)
  
  {
  
      if ((m_iVideoStream < 0) && (m_pFormatContext->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO))
  
      {
  
          m_iVideoStream = i;
  
      }
  
      else if ((m_iAudioStream < 0) && (m_pFormatContext->streams[i]->codec->codec_type == AVMEDIA_TYPE_AUDIO))
  
      {
  
          m_iAudioStream = i;
  
      }
  
  }
  
  
  
  if (!(hasVideo() || hasAudio()))
  
      return false; // Didn't find video or audio stream
  
  
  
  if (hasVideo())
  
  {
  
      if (!openVideoStream())
  
          return false;
  
  }
  
  
  
  if (hasAudio())
  
  {
  
      if (!openAudioStream())
  
          return false;
  
  }
  
  
  
  retrieveFileInfo();
  
  
  
  m_bIsFileOpen = true;
  
  m_strFileName = strFileName;
  
  
  
  if (isImage())
  
  {
  
      m_dDurationInMs = 0;
  
      m_dFps = 0;
  
      m_lCurrentFrameNumber = 1;
  
      decodeImage();
  
  }
  
  
  
  m_bIsThreadRunning = false;
  
  if (m_bIsFileOpen)
  
      CCLOG("FFmpeg open stream succeed");
  
  else
  
      CCLOG("FFmpeg open stream failed"); 
  
  m_iState = eOpened;
  
  
  
  return m_bIsFileOpen;
  
  }

  and added unique_lock in close beginning like this.

  void FFmpegWrapper::close()
  
  {
  
  std::unique_lock lock(g_Mutex, std::try_to_lock);
  
  while (!lock.owns_lock()) 
  
  { 
  
      lock.try_lock()
  
  }
  
  
  
  stop(); 
  
  
  
  if (m_pVideoBuffer != nullptr)
  
  {
  
      delete m_pVideoBuffer;
  
      m_pVideoBuffer = nullptr;
  
  }
  
  
  
  if (m_pVideoFrameRGB != nullptr)
  
  {
  
      av_free(m_pVideoFrameRGB);
  
      m_pVideoFrameRGB = nullptr;
  
  }
  
  
  
  if (m_pVideoFrame != nullptr)
  
  {
  
      av_free(m_pVideoFrame);
  
      m_pVideoFrame = nullptr;
  
  }
  
  
  
  if (m_pAudioFrame != nullptr)
  
  {
  
      av_free(m_pAudioFrame);
  
      m_pAudioFrame = nullptr;
  
  }
  
  
  
  
  
  if (m_pSwScalingContext != nullptr)
  
  {
  
      sws_freeContext(m_pSwScalingContext);
  
      m_pSwScalingContext = nullptr;
  
  }
  
  
  
  if (m_pVideoCodecContext != nullptr)
  
  {
  
      avcodec_close(m_pVideoCodecContext);
  
      m_pVideoCodecContext = nullptr;
  
  }
  
  if (m_pAudioCodecContext != nullptr)
  
  {
  
      avcodec_close(m_pAudioCodecContext);
  
      m_pAudioCodecContext = nullptr;
  
  }
  
  
  
  if (m_pFormatContext != nullptr)
  
  {
  
      avformat_free_context(m_pFormatContext);    
  
      m_pFormatContext = nullptr;
  
  }
  
  if(m_pSwr != nullptr)
  
      swr_free(&m_pSwr);
  
  
  
  CCLOG("CLOSE DONE");
  
  }

  When open is still running ,I want lock mutex again in close in main thread.
  it failed to get mutex ownership it is no problem. But even while loop waited the open() done, try_lock still can’t get the mutex ownership.I thought unique_lock out of scope will unlock mutex ,but it didn’t. I want to know how can I lock the mutex correctly.Thank you !