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• Launch Leech and the History of WMV

  14 septembre 2010, par Multimedia Mike — General

  I was combing through my programming archives again and came across an old Perl script called launch-leech.pl. This was a private script I used to maintain for the benefit of myself and a few friends. See, there was this site called Launch.com (URL doesn’t seem to do anything as of this writing but here’s the Wikipedia page). Purchased by Yahoo ! in 2001, Launch still maintained their independent branding. They also carried a lot of music videos, of which I am a huge junkie. launch-leech.pl was the tool I used to download the videos. This was particularly useful since I stubbornly clung to dialup internet access until mid-2004 and it would have been impossible to stream video at any decent quality (though there were 56k streams, so like I said– not possible at any decent quality).

  
  
  

  Technically
  I followed Launch.com for many years. To be honest, I only “followed” in that I figured out where their “latest videos” URL lived and regularly polled it. Each video had either a 6-, 7-, or 8-digit unique ID that could be plugged into the launch-leech.pl script which would then have a conversation with the relevant servers, determine the correct streaming URL with the highest quality, then download and save the URL by handing it off to an external program (first ASFRecorder, though I later switched to mmsclient).

  At one point, I even wrote a crawler that compiled an offline database of all the videos, their IDs and their metadata. I never thought of anything interesting to do with it, though.

  
  
  

  Windows Media Legacy
  During these glory days of leeching, Launch.com streamed using Windows Media. I admit, it’s a bit of a blur now — the site might have used Real or QuickTime, but I was obviously most in tune with the WM side. I remember when I first found the site circa 2000-2001, the videos were in MS MPEG-4v3, and the high quality bitrate was 300 kbits/sec. Eventually, Launch.com would stream WMV7, WMV8, and finally WMV9, with bitrates up to 700 kbits/sec. However, they never broke free of the 320×240 encoding resolution, which was frustrating. When I wasn’t able to notice any substantial difference between 300 and 700 kbits/sec, I felt it might be time to put those extra bits to work on a resolution upgrade.

  At least they were nice enough to re-encode a number of old videos using better codecs and bitrates with each revision, thus prompting me to scan through the site collecting updated video IDs for download.

  
  
  

  Epilogue
  I don’t clearly remember when I stopped visiting Launch.com. Video-wise, the web has been a blur of Flash video ever since about 2006. Meanwhile, I spent a lot of time collecting a bunch of music videos in the first half of the decade only to find that pretty much every version of every music video made since the dawn of time is available on demand thanks to YouTube. I have found that this phenomenon manifests in many areas as internet technology marches on.

  The Real Entertainment
  The launch-leech.pl tool represents a recurring pattern for me. I derive as much — if not more — entertainment from creating programs like launch-leech.pl (and implicitly reverse engineering something in the process ; in this case, a website) as I do from the intended entertainment media itself. I seem to have this issue a lot with games, too.

  Is this an issue for anyone else ? Am I the only one who would rather play with the box that a shiny toy comes packaged in ?

• video streaming - mp4 file (x264) - and skip to location

  14 mars 2011, par Raoul

  Previously I was using apache to serve .flv files which an embedded player on an intranet page was playing.

  Is it possible to stream mp4 files (x264 encoded) in a similar manner ? Are there any open source scripts/solutions for doing proper streaming (e.g. people can skip to skip to a part of the video without having to download the parts they've skiped over) ?

  If anyone is doing someting similar I'd love to hear from them

  Thanks

• libavcodec ffmpeg huge memory leak

  12 décembre 2016, par aleksandar kamenjasevic

  i have trouble with ffmpeg and memory leak.
  I have class for decoding video, and i make instance of that class for every video file that i have in playlist.
  When i broadcasting video file i don’t have memory leak, only i have when create instance of ffmpeg class. I was play video file in loop for 2 days without increasing memory.

  This is my decoding code :

              if(av_read_frame(pFormatCtx,&packet)>=0){
  
              if(packet.stream_index==videoStream){
  
                  if(first_dts_video==AV_NOPTS_VALUE){
  
                      first_dts_video=packet.pts;
  
                  }
  
                  avcodec_decode_video2(pCodecCtx,pFrameOrg,&frameFinished,&packet);
  
                  if(frameFinished){
  
                      if(first){
  
                          first=false;
  
                          buffer=(uint8_t*)malloc(iNumBytes*sizeof(uint8_t));
  
                          avpicture_fill((AVPicture*)pFrameRGB,buffer,PIX_FMT_RGB24,oWidth,oHeight);
  
                          sws_scale(pSwsCtx,(uint8_t const * const *)pFrameOrg->data,pFrameOrg->linesize,0,pCodecCtx->height,pFrameRGB->data,pFrameRGB->linesize);
  
                          m_file->fillImage(pFrameRGB->data[0],pFrameRGB->linesize[0],iNumBytes);
  
                          m_file->ready=true;
  
                          m_file->wait.notify_all();
  
                          av_frame_free(&pFrameRGB);
  
                          if(buffer!=NULL)
  
                              free(buffer);
  
                      }
  
                      buf=(videoBuff*)malloc(sizeof(videoBuff));
  
                      if(buf==NULL){
  
                          threadRunning=false;
  
                          continue;
  
                      }
  
                      buf->buffer=malloc(bytes*sizeof(uint8_t));
  
                      if(buf->buffer==NULL){
  
                          threadRunning=false;
  
                          continue;
  
                      }
  
                      //qDebug()<isAvi()&&pCodecCtx->pix_fmt==PIX_FMT_YUV420P){                            
  
                          av_buffersrc_add_frame(filter_src_ctx,pFrameOrg);//filter
  
  
  
                          while (1) {//filter
  
                              int ret = av_buffersink_get_frame(filter_sink_ctx, filter_frame);
  
                              if (ret == AVERROR(EAGAIN)){
  
                                  //                                qDebug()<<"EAGAIN";
  
                                  break;
  
                              }else if( ret == AVERROR_EOF){
  
                                  //                                qDebug()<<"AVERROR_EOF";
  
                                  break;
  
                              }
  
                              if (ret < 0){
  
                                  //                                qDebug()<data,filter_frame->linesize,0,pCodecCtx->height,pFrameUYVY422->data,pFrameUYVY422->linesize);//stara verzija je koristila pFrameOrg
  
                              av_frame_unref(filter_frame);
  
                          }
  
  
  
                          av_frame_unref(filter_frame);//ocisti frame od filtera
  
                      }else{
  
                          sws_scale(pSwsCtxUYVY422,(uint8_t const * const*)pFrameOrg->data,pFrameOrg->linesize,0,pCodecCtx->height,pFrameUYVY422->data,pFrameUYVY422->linesize);
  
                      }
  
                      buf->lineSize=pFrameUYVY422->linesize[0];
  
                      buf->bufSize=bytes;
  
                      memcpy(buf->buffer,pFrameUYVY422->data[0],bytes);
  
                      frameCount++;
  
                      m_file->putVideoBuf(buf);
  
                      av_packet_unref(&packet);
  
                  }else{
  
                      av_packet_unref(&packet);
  
                      qDebug()<<"OCE OCE";
  
                      if(syncVideo){
  
                          frameCount++;
  
                          m_file->putVideoBuf(NULL);
  
                      }
  
                  }
  
              }else if(packet.stream_index==audioStream){
  
                  if(firstAudio){
  
                      firstAudio=false;
  
                  }
  
  
  
                  m1.lock();
  
                  audioPackets.append(packet);
  
                  m1.unlock();
  
              }else{
  
                  av_packet_unref(&packet);
  
              }
  
          }

  this is my destructor :

  MYAVClass::~MYAVClass(){
  
  m1.unlock();
  
  this->m1.lock();
  
  threadRunning=false;
  
  if(t1!=NULL){
  
      this->m1.unlock();
  
      if(this->t1->joinable())
  
          this->t1->join();
  
      delete t1;
  
      flush();
  
  }
  
  if(pFrameOrg!=NULL)
  
      av_frame_free(&pFrameOrg);
  
  if(pFrameRGB!=NULL)
  
      av_frame_free(&pFrameRGB);
  
  if(pFrameAudio!=NULL)
  
      av_frame_free(&pFrameAudio);
  
  if(pFrameUYVY422!=NULL)
  
      av_frame_free(&pFrameUYVY422);
  
  if(filter_frame!=NULL){
  
      av_frame_free(&filter_frame);
  
      filter_frame=NULL;
  
  }
  
  if(filter_audio_frame!=NULL){
  
      av_frame_free(&filter_audio_frame);
  
      filter_audio_frame=NULL;
  
  }
  
  if(filter_graph!=NULL){
  
      avfilter_graph_free(&filter_graph);
  
      filter_graph=NULL;
  
  }
  
  if(filter_a_graph!=NULL){
  
      avfilter_graph_free(&filter_a_graph);
  
      filter_a_graph=NULL;
  
  }
  
  
  
  if(pCodecCtx!=NULL){
  
      avcodec_close(pCodecCtx);
  
      avcodec_free_context(&pCodecCtx);
  
  }
  
  if(aCodecCtx!=NULL){
  
      avcodec_close(aCodecCtx);
  
      avcodec_free_context(&aCodecCtx);
  
  }
  
  if(pFormatCtx!=NULL)
  
      avformat_close_input(&pFormatCtx);
  
  if(audioBuffer!=NULL)
  
      free(audioBuffer);
  
  if(pSwsCtx!=NULL)
  
      sws_freeContext(pSwsCtx);
  
  if(pSwsCtxUYVY422!=NULL)
  
      sws_freeContext(pSwsCtxUYVY422);
  
  if(sws_ctx_audio!=NULL)
  
      swr_free((SwrContext**)&sws_ctx_audio);
  
  if(audioBuffRes!=NULL)
  
      free(audioBuffRes);
  
  if(audioTmpBuf!=NULL)
  
      free(audioTmpBuf);
  
  if(buffer_UYVY422!=NULL){
  
      free(buffer_UYVY422);
  
  }
  
  }

  Also i notice that i have massive memory leak when i use functions

  if(avcodec_open2(pCodecCtx,pCodec,NULL)!=0){
  
      QMessageBox::critical(NULL,"OPEN CODEC","SISTEMSKA GRESKA");
  
      pFile->setHaveFileInfo(false);
  
      return;
  
  }

  and after i decode first video frame.

  When i create 40 instances of this class, and then i delete all of it, 600 MB left in memory.

  I would appreciate your help. Thank you very much.

  //EDIT
  this is place where i put my VideoBuff*

  void VideoFile::putVideoBuf(videoBuff *buf){
  
  if(buf==NULL&&!videoPackets.isEmpty()){
  
      m1.lock();
  
      qDebug()<<"NULL";
  
      videoBuff *tmpBuf=new videoBuff;
  
      tmpBuf->bufSize=videoPackets.last()->bufSize;
  
      tmpBuf->lineSize=videoPackets.last()->lineSize;
  
      tmpBuf->buffer=malloc(tmpBuf->bufSize);
  
      memcpy(tmpBuf->buffer,videoPackets.last()->buffer,tmpBuf->bufSize);
  
      videoPackets.append(tmpBuf);
  
      m1.unlock();
  
  }else if(buf!=NULL){
  
      this->m1.lock();
  
      videoPackets.append(buf);
  
      this->m1.unlock();
  
  }else{
  
      qDebug()<<"-.-";
  
  }}

  This is function for pulling my VideoBuf*

  videoBuff *VideoFile::getNextVideoBuf(){
  
  if(this->getTvReady()){
  
      if(videoPackets.size()>0&&audioPackets.size()>0){
  
          this->m1.lock();
  
          videoBuff *tmp=NULL;
  
          if(!videoPackets.isEmpty())
  
              tmp=videoPackets.first();
  
          if(tmp==NULL){
  
              this->m1.unlock();
  
              return NULL;
  
          }
  
          if(!videoPackets.isEmpty())
  
              videoPackets.removeFirst();
  
          if(videoTaken>=*numberOfframes)
  
              videoTaken=0;
  
          videoTaken++;
  
          qDebug()<m1.unlock();
  
          return tmp;
  
      }else{
  
          this->removeLastVideoFrames(videoPackets.size());
  
          this->removeLastAudioFrames(audioPackets.size());
  
          currentLive=NULL;
  
          emit finish();
  
          return NULL;
  
      }
  
  }else{
  
      return NULL;
  
  }}

  This is place where i pull my VideoBuf*

  bool DecklinkDevice::ScheduleNextVideoFrame(bool preroling){
  
  iDecklinkOutput->CreateVideoFrame(currentOutput->getWidth(),currentOutput->getHeight(),currentOutput->getWidth()*bytesPerPix,videoFormat,bmdFrameFlagDefault,&m_videoFrame);
  
  if(preroling==false){
  
      if(running==false){
  
          this->mutex.unlock();
  
          return false;
  
      }
  
  }
  
  if(currentOutput==NULL){
  
      this->mutex.unlock();
  
      return false;
  
  }
  
  timeCode=new MyTimeCode;
  
  timeCode->setFps(currentOutput->getFramesPerSec());
  
  void *buf;
  
  m_videoFrame->GetBytes(&buf);
  
  bool isLogo=false;
  
  bool isTimeLogo=false;
  
  VideoFile *f=nextVideoBuf->getVideoFile();
  
  if(f!=NULL){
  
      videoBuff *n_buf=nextVideoBuf->getVideoFile()->getNextVideoBuf();
  
      isLogo=f->getLogo();
  
      isTimeLogo=f->getTimeLogo();
  
      timeCode->setVideoFile(f);
  
      if(n_buf!=NULL){
  
          m_videoFrame->SetTimecode(timeCodeFormat,timeCode);
  
          if(lastVideoBuff!=NULL)
  
              free(lastVideoBuff);
  
          lastVideoBuff=malloc(n_buf->bufSize);
  
          memcpy(buf,n_buf->buffer,n_buf->bufSize);
  
          memcpy(lastVideoBuff,buf,n_buf->bufSize);
  
          lastVideoBuffSize=n_buf->bufSize;
  
          free(n_buf->buffer);
  
          free(n_buf);
  
      }else{
  
          void *buf;
  
          m_videoFrame->GetBytes(&buf);
  
          timeCode->setLast();
  
          memcpy(buf,lastVideoBuff,lastVideoBuffSize);
  
      }
  
  }else{
  
      void *buf;
  
      m_videoFrame->GetBytes(&buf);
  
      if(lastVideoBuff==NULL){
  
          lastVideoBuff=malloc(m_videoFrame->GetWidth()*m_videoFrame->GetHeight()*bytesPerPix);
  
          memset(lastVideoBuff,100,m_videoFrame->GetWidth()*m_videoFrame->GetHeight()*bytesPerPix);
  
      }
  
      memcpy(buf,lastVideoBuff,m_videoFrame->GetWidth()*m_videoFrame->GetHeight()*bytesPerPix);
  
  }
  
  if(alphaSupport()){
  
      int rowId=nextAudioBuf->getSettings()->getLogoPos().y();
  
      uchar *ptr=(uchar*)buf;
  
      if(isLogo){
  
          uchar *pptr=logo->bits();
  
          for(int i=0;ibyteCount();i=i+4){
  
  
  
              if(i%logo->bytesPerLine()==0){
  
                  rowId++;
  
  
  
              }
  
              if(pptr[i+3]!=255)
  
                  continue;
  
              int offset=(i%logo->bytesPerLine()+nextVideoBs-Ÿ>getSettings()->getLogoPos().x()*bytesPerPix);
  
              ptr[offset+m_videoFrame->GetRowBytes()*rowId]=pptr[i+3];
  
              ptr[offset+1+m_videoFrame->GetRowBytes()*rowId]=pptr[i+2];
  
              ptr[offset+2+m_videoFrame->GetRowBytes()*rowId]=pptr[i+1];
  
              ptr[offset+3+m_videoFrame->GetRowBytes()*rowId]=pptr[i];
  
          }
  
      }
  
      if(isTimeLogo){
  
          QImage im(m_videoFrame->GetWidth()/5,100,QImage::Format_ARGB32);
  
          QPainter p(&im);
  
          p.setRenderHints(QPainter::RenderHints(QPainter::SmoothPixmapTransform|QPainter::TextAntialiasing|QPainter::HighQualityAntialiasing|QPainter::TextAntialiasing|QPainter::Antialiasing));
  
          p.fillRect(im.rect(),QColor(0,0,0));
  
          QFont f;
  
          f.setFamily(f.defaultFamily());
  
          f.setPointSize(25);
  
          p.setFont(f);
  
          QPen pen;
  
          pen.setColor(Qt::white);
  
          p.setPen(pen);
  
          p.setBrush(QBrush(QColor(255,255,255)));
  
          p.drawText(im.rect(),QTime::currentTime().toString("hh:mm"));
  
          for(int i=0;igetSettings()->getLogoPos().x()*bytesPerPix);
  
              ptr[offset+m_videoFrame->GetRowBytes()*rowId]=im.bits()[i+3];
  
              ptr[offset+1+m_videoFrame->GetRowBytes()*rowId]=im.bits()[i+2];
  
              ptr[offset+2+m_videoFrame->GetRowBytes()*rowId]=im.bits()[i+1];
  
              ptr[offset+3+m_videoFrame->GetRowBytes()*rowId]=im.bits()[i+0];
  
  
  
          }
  
      }
  
  }
  
  iDecklinkOutput->ScheduleVideoFrame(m_videoFrame,numberOfVideoFrames*currentOutput->getFrameDuration(),currentOutput->getFrameDuration(),currentOutput->getTimeScale());
  
  numberOfVideoFrames++;
  
  timeCode->update();
  
  return true;}

  Here ,in this callback function, I free video bits and timecode object ;

  HRESULT DLPlaybackDelegate::ScheduledFrameCompleted(IDeckLinkVideoFrame *completedFrame, BMDOutputFrameCompletionResult result){
  
  IDeckLinkTimecode *t=NULL;
  
  completedFrame->GetTimecode(bmdTimecodeVITC,&t);
  
  if(t!=NULL){
  
      MyTimeCode *mt=(MyTimeCode*)t;
  
      VideoFile *f=NULL;
  
      f=mt->getVideoFile();
  
      if(f!=NULL){
  
          f->frameEmited();
  
      }
  
      t->Release();
  
  }
  
  
  
  completedFrame->Release();
  
  completedFrame=NULL;
  
  static uint64_t frames=0;
  
  m_device->ScheduleNextVideoFrame(false);
  
  return S_OK;}

  //edit 12.12.2016
  Hello, after i download source code from ffmpeg site, and compile last version of a ffmpeg, i lost memory leak. Now everything works very fine.

  Also i notice in libsmbclient.c ,ffmpeg source file, that smbc_set_context(libsmbc->ctx) ; is not used in functions that reading from network shares. Without this, program will crash if you try to read multiple files from a multiple threads. Is this a bug ?