Recherche avancée

Sur d’autres sites (6748)

• libavfilter : Add derain filter

  30 mai 2019, par Xuewei Meng

  libavfilter : Add derain filter
  Remove the rain in the input image/video by applying the derain
  
  methods based on convolutional neural networks. Training scripts
  
  as well as scripts for model generation are provided in the
  
  repository at https://github.com/XueweiMeng/derain_filter.git.
  Signed-off-by : Xuewei Meng <xwmeng96@gmail.com>
  

  • [DH] doc/filters.texi
  • [DH] libavfilter/Makefile
  • [DH] libavfilter/allfilters.c
  • [DH] libavfilter/vf_derain.c

• How can I programmatically delete frames from an mpg video and keep the audio in sync ?

  22 janvier 2018, par Pima omg

  I stream training videos from work, but don’t have a great connection and get a lot of buffering. I have captured the streamed video from the PC screen into an mpg file. Fortunately when the video buffers, it shows a characteristic buffering icon in the center of the screen and there is no sound. Using ffmpeg, I have been able to write a c++ method that can step through the video frames of the mpeg file, convert to an RBG frame and detect the presence or absence of this characteristic buffering icon.

  The final thing I need to do is generate a new mpeg file with only the frames that do not have this buffering image, and keep all the audio in sync. How do I do that with ffmpeg ?

  I have already found the dts and pts timestamps on the video and audio frames, but don’t know how to use this information to recode just the frames that don’t have the buffering image. The recode should keep all the properties of the original (framerate, resolution, size etc)

  Here is the stripped down code I use to traverse the frame and detect which ones I want to keep (omitting a lot of initialization and error checking)

  while (av_read_frame(pFormatCtx, &packet) >= 0)
  
      {
  
          // Is this a packet from the video stream?
  
          if (packet.stream_index == videoStream)
  
          {
  
              // Decode video frame
  
              avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished, &packet);
  
  
  
              // Did we get a video frame?
  
              if (frameFinished)
  
              {
  
                  // Convert the image from its native format to RGB
  
                  sws_scale(sws_ctx, (uint8_t const * const *)pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pFrameRGB->data, pFrameRGB->linesize);
  
                  if (ThisIsAFrameIWant(pFrameRGB))
  
                  {
  
                      WRITE FRAME TO NEW MPEG KEEPING AUDIO IN SYNC
  
                  }
  
              }
  
          }
  
      }

• How to add arbitrary or custom metadata in MP4 ?

  13 avril 2021, par 大大大大萝卜凉

  The MP4 muxer in ffmpeg only allows certain metadata by default. I would like to add :

  


  com.android.model: Mi 10 Pro
xyz: +22.9835+113.3621/
com.android.version: 1
com.android.manufacturer: Xiaomi


  


  How can I add this with ffmpeg ?