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• dxva2 : Increase maximum number of slices for mpeg2

  6 mars 2014, par Rainer Hochecker

  dxva2 : Increase maximum number of slices for mpeg2
  Some content requires an higher number of slices in order to
  
  render properly.
  Rise the number to 1024 and warn if ever it exceeds.
  Signed-off-by : Luca Barbato <lu_zero@gentoo.org>
  

  • [DH] libavcodec/dxva2_mpeg2.c

• the number of frames in ts file

  12 juin 2017, par j.teak

  i got video data from my web camera, and using ffmpeg to make ts, m3u8

  but ts what made by ffmpeg, each ts has different the number of frames.

  so, how can i make the number of frames equally ?

  and each gop size in ts are also different..

  how can i make gop size is constant ?

  avformat_alloc_output_context2(&ptr->hls_ctx, NULL, "hls", "hls.m3u8");
  
  ((HLSContext*)ptr->hls_ctx->priv_data)->flags = HLS_DELETE_SEGMENTS | HLS_ROUND_DURATIONS;
  
  ((HLSContext*)ptr->hls_ctx->priv_data)->max_nb_segments = 2;
  
  ((HLSContext*)ptr->hls_ctx->priv_data)->time = 2;

  i already use time parameter for setting ts’s play time

• OpenCV 4.5.2 VideoWriter produces “can't find starting number” error

  28 avril 2021, par Peter Kronenberg

  There are several issues with similar names, but none of them seem to have a definitive answer. Using the last version of OpenCV 4.5.2 with Java on Windows 10. Below is a short reproducible test case which results in

  


  [ERROR:0] global C:\build\master_winpack-bindings-win64-vc14-static\opencv\modules\videoio\src\cap.cpp (589) cv::VideoWriter::open VIDEOIO(CV_IMAGES): raised OpenCV exception:

OpenCV(4.5.2) C:\build\master_winpack-bindings-win64-vc14-static\opencv\modules\videoio\src\cap_images.cpp:253: error: (-5:Bad argument) CAP_IMAGES: can't find starting number (in the name of file): C:/testfiles/output.avi in function 'cv::icvExtractPattern'


  


  Here is the code :

  


  public class OpenCVError {

    public static void main(String[] args) {
        System.loadLibrary(Core.NATIVE_LIBRARY_NAME);

        final int fourcc = VideoWriter.fourcc('m', 'j', 'p', 'g');
        final double fps = 30.00;
        Size frameSize = new Size(1080, 1920);
        VideoWriter videoWriter = new VideoWriter("C:/testfiles/output.avi", fourcc, fps, frameSize, true);
    }
}


  


  Update

  


  Found out from https://forum.opencv.org/t/error-in-java-cant-find-starting-number-in-the-name-of-file/3014 that I seem to be missing opencv_videoio_ffmpeg452_64.dll
I am using the Maven distribution at

  


    <dependency>&#xA;            <groupid>org.openpnp</groupid>&#xA;            <artifactid>opencv</artifactid>&#xA;            <version>4.5.1-2</version>&#xA;  </dependency>&#xA;

  


  which doesn't appear to have this file. I tried adding the file to my classpath (using IntelliJ), but it still doesn't seem to work.

  


  Anyone have any ideas ? Why isn't this file part of the openpnp distribution ?