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• When NVIDIA GPU is used for H265 video decoding acceleration, the video screen may skip forward frames, while AMD GPU does not [closed]

  16 août 2023, par uproar

  We are using NVIDIA GPUs (model : GTX1050TI) to accelerate H.265 video decoding and rendering, and DXVA2 hardware acceleration is used. The version of FFmpeg is 4.2.2.
If the video is played for a long time, there will be frame skipping forward (that is, the video frame of the first few seconds will appear when it is played in normal order), and it will always exist after it appears, and it will not heal itself.
Has anyone been in the same situation or can anyone help ?

  


  We checked the rendering and playback timing of each frame and found that no forward jump occurred. Therefore, the data decoded by the GPU may be incorrect.
We also used AMD GPUs for comparison tests, but this is not the case with AMD GPUs.

  


• FFMPEG Overlay video on top of another video

  19 mai 2014, par James Blackbj Blackburn

  I have looked through all the questions on this on stackoverflow but none of the answers worked for me.

  I have a screen recorded video in mp4 and another video recorded from a webcam in mp4. I want to overlay the webcam video over the top left of the screen recorded video.

  I think I finally found the right command line for doing this but when I step through the ffmpeg process it freezes when it reaches " handler_name :SoundHandler".

  Here is my command line :

  string overlayPosition = "movie=" + '"' + _videoFile.FileName + '"' + "[inner]; [in][inner] overlay [out]";
  
  string overLayCommand = "-i " + '"' + videoList[0].Path + '"' + " -vf " + '"' + overlayPosition + '"' +  + '"' + " C:\\Users\\james\\output.mp4" + '"';

  Does anyone know what I am doing wrong ? I’ve managed to trim audio and video, crop video, join sound, join video, and join sound and video but cannot get overlay to work :(.

• How to convert ogv video file into Mp4 video format using Java

  16 février 2016, par Srinivasan Seenu

  I need to convert OGV VIDEO Format into MP4 VIDEO Format.

  • I use this below Java code to convert MP4 VIDEO Format to OGV VIDEO Format it is working fine.
  • For MP4 Format I use audio.setCodec(" AudioAttributes.DIRECT_STREAM_COPY") and video.setCodec("VideoAttributes.DIRECT_STREAM_COPY ").

  • But If I use this same code by change audio.setCodec(" libvorbis") and video.setCodec("mpeg4 ") it is not getting converted from Ogv to Mp4 Format. And also I try some codec in my sample program.

  • I am not able convert from Ogv to Mp4 Format.

  public class VideoConvert {
  
      public static void main(String[] args) throws IOException {
  
      File source = new File("D:\\readxml\\videoConvertorProject\\MP4toOGV\\mp4\\Sample1.ogv");
  
      File target = new File("D:\\readxml\\videoConvertorProject\\MP4toOGV\\ogv\\Sample2.mp4");
  
      AudioAttributes audio = new AudioAttributes();
  
      //audio.setCodec("libvorbis");
  
      audio.setCodec("libfaac");
  
      //audio.setCodec("libmp3lame");
  
      //audio.setCodec(AudioAttributes.DIRECT_STREAM_COPY);
  
      audio.setBitRate(new Integer(128000));
  
      audio.setSamplingRate(new Integer(44100));
  
      audio.setChannels(new Integer(2));
  
      VideoAttributes video = new VideoAttributes();
  
      video.setBitRate(new Integer(160000));
  
      video.setFrameRate(new Integer(15));
  
      //video.setSize(new VideoSize(176, 144));
  
      //video.setCodec("libtheora");
  
      video.setCodec("mpeg4");
  
      //video.setCodec(VideoAttributes.DIRECT_STREAM_COPY);
  
      EncodingAttributes attrs = new EncodingAttributes();
  
      attrs.setFormat("mp4");
  
      attrs.setAudioAttributes(audio);
  
      attrs.setVideoAttributes(video);
  
      Encoder encoder = new Encoder();
  
      try {
  
          encoder.encode(source, target, attrs);
  
      } catch (IllegalArgumentException e) {
  
          e.printStackTrace();
  
      } catch (InputFormatException e) {
  
          e.printStackTrace();
  
      } catch (EncoderException e) {
  
          e.printStackTrace();
  
      }
  
  }