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• FFMPEG eats all the memory

  19 mai 2021, par Abhinandan Chakraborty

  Probably one of the most cliche question but here is the problem : So I have a Ubuntu Server running as an isolated machine only to handle FFMPEG jobs. It has 4 vCPU, 4GB RAM, 80GB storage. I am currently using this script to convert a video into HLS playlist : https://gist.github.com/maitrungduc1410/9c640c61a7871390843af00ae1d8758e This works fine for all video including 4K recorded from iPhone. However, I am trying to add watermark so I changed the line 106 of this script

  


  from :

  


  cmd+=" ${static_params} -vf scale=w=${widthParam}:h=${heightParam}"


  


  to :

  


  cmd+=" ${static_params} -filter_complex [1]colorchannelmixer=aa=0.5,scale=iw*0.1:-1[wm];[0][wm]overlay=W-w-5:H-h-5[out];[out]scale=w=${widthParam}:h=${heightParam}[final] -map [final]"


  


  Now this works flawlessly in videos from Youtube or other sources but as soon as I am trying to use 4K videos from iPhone, the RAM usage grows from 250MB to 3.8GB in less than minute and crashes the entire process. So I looked out for some similar question :

  


  

  1. FFmpeg Concat Filter High Memory Usage

  


  2. https://github.com/jitsi/jibri/issues/269

  


  3. https://superuser.com/questions/1509906/reduce-ffmpeg-memory-usage-when-joining-videos

  


  4. ffmpeg amerge Error while filtering : Cannot allocate memory

  


  


  I understand that FFMPEG requires high amount of memory consumption but I am unsure what's the exact way to process video without holding the stream in the memory but instead release any memory allocation in real-time. Even if we decide to work without watermark, It still hangs around 1.8GB RAM for processing 5 seconds 4K video and this create a risk of what if our user upload rather longer video than it will eventually crash down the server. I have thought about ulimit but this does seem like restricting FFMPEG instead of writing an improved command. Let me know how I can tackle this problem. Thanks

  


• Memory leak when using av_frame_get_buffer()

  19 juillet 2018, par Alec Matthews

  I am making a simple video player with ffmpeg. I have noticed that there is a memory leak originating in libavutil. Because ffmpeg is a mature library I assume that I am allocating a new frame incorrectly. The documentation is also vague about freeing the buffer that is created when you call av_frame_get_buffer(). Below is the code I am using to decode the video and queue it up for display on the UI thread.

  DWORD WINAPI DecoderThread(LPVOID lpParam)
  
  {
  
      AVFrame *frame = NULL;
  
      AVPacket pkt;
  
  
  
      SwsContext *swsCtx = NULL;
  
      UINT8 *buffer = NULL;
  
      INT iNumBytes = 0;
  
  
  
      INT result = 0;
  
  
  
      frame = av_frame_alloc();
  
  
  
      av_init_packet(&pkt);
  
      pkt.data = NULL;
  
      pkt.size = 0;
  
  
  
      // Create scaling context
  
      swsCtx = sws_getContext(codecCtx->width, codecCtx->height, codecCtx->pix_fmt, codecCtx->width, codecCtx->height, AV_PIX_FMT_BGR24, SWS_BICUBIC, NULL, NULL, NULL);
  
  
  
     while (av_read_frame(fmtCtx, &pkt) >= 0) {
  
          if (pkt.stream_index == videoStream) {
  
              result = avcodec_send_packet(codecCtx, &pkt);
  
  
  
              while (result >= 0) {
  
                  result = avcodec_receive_frame(codecCtx, frame);
  
                  if (result == AVERROR(EAGAIN) || result == AVERROR_EOF) {
  
                      break;
  
                  } else if (result < 0) {
  
                      // another error.
  
                  }
  
                  // Create a new frame to store the RGB24 data.
  
                  AVFrame *pFrameRGB = av_frame_alloc();
  
                  // Allocate space for the new RGB image.
  
                  //av_image_alloc(pFrameRGB->data, pFrameRGB->linesize, codecCtx->width, codecCtx->height, AV_PIX_FMT_BGR24, 1);
  
                  // Copy all of the properties from the YUV420P frame.
  
                  av_frame_copy_props(pFrameRGB, frame);
  
                  pFrameRGB->width = frame->width;
  
                  pFrameRGB->height = frame->height;
  
                  pFrameRGB->format = AV_PIX_FMT_BGR24;
  
                  av_frame_get_buffer(pFrameRGB, 0);
  
  
  
                  // Convert fram from YUV420P to BGR24 for display.
  
                  sws_scale(swsCtx, (const UINT8* const *) frame->data, frame->linesize, 0, codecCtx->height, pFrameRGB->data, pFrameRGB->linesize);
  
  
  
                  // Queue thr BGR frame for drawing by the main thread.
  
                  AddItemToFrameQueue(pFrameRGB);
  
  
  
                  av_frame_unref(frame);
  
              }
  
          }
  
         while (GetQueueSize() > 100) {
  
              Sleep(10);
  
         }
  
     }
  
  
  
      CloseFrameQueue();
  
  
  
      av_frame_free(&frame);
  
     avcodec_close(codecCtx);
  
     avformat_close_input(&fmtCtx);
  
  
  
      return 0;
  
  }

  Is there a better way to allocate a new frame for holding the post sws_scale() transformation ?

  There is a similar stackoverflow question that uses mostly depreciated function calls. I can’t seem to find any answers that conform to the new version of ffmpeg in the documentation. Any help would be appreciated.

• Can't merge mp4 files with FFmpeg on android

  6 mai 2017, par Brian

  I’m using https://github.com/hiteshsondhi88/ffmpeg-android-java in an app that needs to combine multiple mp4 files into one.

  Here is a command

  ffmpeg -i concat:"/data/data/com.testapp.app/cache:temp/lds82df9skov65i15k3ct16cik.mp4|/data/data/com.testapp.app/cache:temp/qm5s0utmb8c1gbhch6us2tnilo.mp4" -codec copy /data/data/com.testapp.app/cache:temp/4egqalludvs03tnfleu5dgb6iv.mp4

  java method to append files, movie files is an array holding files i want to combine

  public void appendFiles() {
  
  
  
      showProgressDialog();
  
  
  
      movieFile = getRandomFile();
  
  
  
      StringBuilder b = new StringBuilder();
  
  
  
      try {
  
  
  
          for (int i = 0; i < movieFiles.size(); i++) {
  
  
  
              File f = movieFiles.get(i);
  
  
  
              if (!f.exists()) {
  
                  continue;
  
              }
  
  
  
              if(i != 0){
  
                  b.append("|");
  
              }
  
  
  
              b.append(f.getPath());
  
  
  
  
  
          }
  
  
  
          final String command = "-i concat:\""+b.toString() + "\" -codec copy " + movieFile.getPath();
  
  
  
  
  
  
  
          try {
  
              ffmpeg.execute(command, new ExecuteBinaryResponseHandler() {
  
                  @Override
  
                  public void onFailure(String s) {
  
                      app.log("FAILED with output : " + s);
  
                  }
  
  
  
                  @Override
  
                  public void onSuccess(String s) {
  
                      app.log("SUCCESS with output : " + s);
  
  
  
                      createThumbnail();
  
  
  
                      stopProgressDialog();
  
  
  
                      startReview();
  
                  }
  
  
  
                  @Override
  
                  public void onProgress(String s) {
  
                      app.log("Started command : ffmpeg " + command);
  
  
  
                  }
  
  
  
                  @Override
  
                  public void onStart() {
  
  
  
                      app.log("Started command : ffmpeg " + command);
  
  
  
                  }
  
  
  
                  @Override
  
                  public void onFinish() {
  
                      app.log("Finished command : ffmpeg " + command);
  
  
  
                  }
  
              });
  
          }
  
          catch (FFmpegCommandAlreadyRunningException e) {
  
              e.printStackTrace();
  
          }
  
  
  
  
  
      }
  
  
  
      catch (Exception e) {
  
          e.printStackTrace();
  
      }
  
  
  
  }

  and getRandomFile()

      public File getRandomFile() {
  
          if (captureDir != null) {
  
              if (captureDir.exists()) {
  
  
  
                  SecureRandom random = new SecureRandom();
  
                  File file = new File(captureDir, new BigInteger(130, random).toString(32) + ".mp4");
  
                  return file;
  
              }
  
          }
  
          return null;
  
      }

  but I keep seeing the error no such file or directory

  concat :"/data/data/com.testapp.app/cache:temp/lds82df9skov65i15k3ct16cik.mp4|/data/data/com.testapp.app/cache:temp/qm5s0utmb8c1gbhch6us2tnilo.mp4" : No such file or directory

  any ideas ?