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• ffmediaplayer playing but screen keeps black

  27 août 2023, par Joergahmann

  I#m coding a video tool for sports with the Windows Template Studio and using the Community Toolkit.MVVM. I finished this with the vlcMediaPlayer and it worked almost fine. I need the Frameback (vlc does not provide) and I like autohiding the controls (which is hard with vlc). So I decided to use the ffmediaelemrnt instead.
Almost everything is ok (I hear sound, i can pause, forward ..), only the Video is not showing !!

  


  I'm using an observable property

  


  `    [ObservableProperty]
     private MediaElement _ffmeMediaElement;`


  


  instead of the original implementation with a complete different basemodel :

  


  public MediaElement MediaElement
        {
            get
            {
                if (m_MediaElement == null)
                    m_MediaElement = (Application.Current.MainWindow as MainWindow)?.Media;

                return m_MediaElement;
            }
        }


  


  —> Could this be the problem ? How do I get the (Application.Current.MainWindow as MainWindow) ? in my case with no mainwindow and a page instead


  


                      



  


  What I tried
When I use a contentcontrol instead : the Video is showing, but the controls are not autohiding anymore

  


  When I compile your WindowsSample, it works completly, but still shows the error Object reference not set to an instance of an object on

  


  I would appreciate any help. Thank you in advance

  


• FFmpeg Not Creating or Appending Final HLS Segment When RTMP Stream Ends [closed]

  14 août 2024, par Arjit

  I am transcoding an RTMP stream to HLS using FFmpeg, and I have a problem : when the RTMP stream finishes, the last segment, which does not reach the target duration, is not created as a .ts file. Consequently, this last segment is not appended to the playlist file.

  


  command :

  


  fmpeg -i rtmp://localhost:1935/live/xyz -c:v libx264 -preset veryfast -b:v 400k -c:a aac -b:a 64k -s 426x240 -hls_playlist_type event -hls_time 10 -hls_list_size 0 -hls_segment_filename jack/240p_%03d.ts jack/240p.m3u8


  


  I expected that when the RTMP stream ends or when i terminate that FFmpeg process, FFmpeg would create a .ts file for the last segment, even if it is shorter than the target duration (10 seconds), and that this segment would be appended to the playlist (output.m3u8).

  


• Concat with short inpoint and outpoint differences leads to long still image in the final video

  11 mai 2017, par P. Dee

  I create a list.txt with inpoint and outpoint markers, that are sometimes close - down to 0.5s in difference with GoPro MP4-files.

  Then I use -y -f concat -safe 0 -i list.txt -c:v libx264 -c:a aac -af aresample=async=1 -pix_fmt yuv420p "filename.mp4".

  What happens is that the smaller the differences between inpoint and outpoint are, the longer a still image of the first video image is shown. Recently I had a 60 seconds long video and 30 seconds of it at the beginning were just the same image.

  How do I need to change my command ?