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• 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 ?

  


• slicethread : Limit the automatic number of threads to 16

  5 septembre 2022, par Martin Storsjö

  slicethread : Limit the automatic number of threads to 16
  This matches a similar cap on the number of automatic threads
  
  in libavcodec/pthread_slice.c.
  On systems with lots of cores, this fixes a couple fate failures
  
  in 32 bit mode on such machines (where spawning a huge number of
  
  threads runs out of address space).
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavutil/slicethread.c