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• arm/aarch64 : Improve scheduling in the avg form of h264_qpel

  3 septembre 2021, par Martin Storsjö

  arm/aarch64 : Improve scheduling in the avg form of h264_qpel
  Don't use the loaded registers directly, avoiding stalls on in
  
  order cores. Use vrhadd.u8 with q registers where easily possible.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavcodec/aarch64/h264qpel_neon.S
  • [DH] libavcodec/arm/h264qpel_neon.S

• How to encode video with ffmpeg form videocapture Mat

  26 août 2022, par chromize

  I'm trying to make video editor tool.

  


  [Environment]
C#
WPF
OpenCVSharp4.5

  


  When encoding video,I have to set some config.(fps/width/height/codec/bitrate/field-order)
But,can't set field-order with opencv's videowriter.

  


          VideoWriter video = new VideoWriter(
            outPutFilePath,
            VideoCaptureAPIs.FFMPEG,
            VideoWriter.FourCC(Char.Parse("M"),
            Char.Parse("P"),
            Char.Parse("4"),
            Char.Parse("V"),
            fps,
            new OpenCvSharp.Size(Width, Height),
            true);
            for (int movePos = StartFrame; movePos < EndFrame; movePos++)
            {
                PosFrames = movePos;
                Mat mat = SetMatFromFrameNo(PosFrames);

                video.Write(mat);
               Cv2.WaitKey(1);
            }


  


  so,I'm trying to use piped ffmpeg.
But I have no idea.

  


  Could you tell how to encode video From VideoCaptures. thanks.

  


• Extracting Frames form Video in Android [closed]

  2 juillet 2024, par Muhammad Bilal

  I want to extract frames from video and want to change the frames at that point where i extracted the frames.

  


  I have scene apps like Video Status Maker(https://play.google.com/store/apps/details?id=com.krishna.videostatusmaker), Vidify (https://play.google.com/store/apps/details?id=com.beautifullyrical.videomaker). These apps are using template videos. In my view there is a json file behind the video which exactly tells where the frames should be replaced in the video. I checked out the FFmpeg. It is giving me the frames but as i said there must be file which tells where the frames should be replaced. If anyone Knows how this can be done then please guide me. Thanks