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• FFmpeg : Build ffplay on Windows with Visual Studio and MSYS2

  13 septembre 2023, par San Zhang

  I have built FFmpeg on Windows with Visual Studio and MSYS2.

  


  My problem is, ffplay.exe is not built. Some search online suggests the reason might be of missing dependencies(most likely sdl2). I then installed sdl2 with MSYS2, and realized that the only sdl2 package available was built with MinGW. I imagine this means Visual Studio won't be able to use it to build ffplay.exe.

  


  My question : I can download sdl2 that's built with VC++, but how do I incorporate that into the FFmpeg build ? Do I simply put SDL2.dll under [MSYS2_Folder]\mingw64\bin ?

  


  Any thought/idea ?

  


• qsvenc : AVBR is not supported on non-windows OS

  30 janvier 2018, par Zhong Li

  qsvenc : AVBR is not supported on non-windows OS
  AVBR is supported from API 1.3 but only available for Windows
  Signed-off-by : Zhong Li <zhong.li@intel.com>
  
  Signed-off-by : Maxym Dmytrychenko <maxim.d33@gmail.com>
  

  • [DBH] libavcodec/qsvenc.c
  • [DBH] libavcodec/qsvenc.h

• Issue with Asynchronous Video Processing and New Window Creation in Windows Forms Application

  2 août 2023, par sadra hoseini

  I have a Windows Forms application that uses FFmpeg for video processing tasks. In this application, I have a textBox2_TextChanged event handler that performs some video processing tasks based on user input.

  


  However, I noticed that when textBox2_TextChanged is called, the UI becomes unresponsive, and it seems like another window is being created but doesn't show up. I suspect that this issue is related to threading.

  


  Here's a simplified version of the problematic code :

  


  // Relevant code snippet:
private async void textBox2_TextChanged(object sender, EventArgs e)
{
    if (listBox1.Items.Count > 0 && int.TryParse(textBox2.Text, out int itemvalue) && int.TryParse(textBox1.Text, out int ratio))
    {
        await Task.Run(() =>
        {
            // Video processing code using FFmpeg (e.g., creating thumbnails).
            // This code seems to cause the UI to freeze and prevent new windows from showing up.
        });
    }
}


  


  Expected Behavior :

  


  When a user enters a valid input in textBox2, the video processing tasks should be executed in the background without freezing the UI. The application should remain responsive, and any new windows, including message boxes or progress dialogs, should show up as expected.

  


  Actual Behavior :

  


  When a user enters a valid input in textBox2, the video processing tasks appear to be running, but the UI becomes unresponsive, and new windows, such as message boxes, do not show up as expected. This makes it challenging to display any progress or error messages to the user during video processing.

  


  Steps to Reproduce :

  


  Open the Windows Forms application.
Add some video files to the list (listBox1) and provide valid input in textBox2.
Observe the UI behavior and any new windows that should be displayed, such as progress dialogs or message boxes.
Additional Notes :

  


  I am using Visual Studio [version] for development.
The application uses FFmpeg for video processing tasks, and I've verified that FFmpeg is functioning correctly.
I've also tried using proper error handling to catch any exceptions, but no exceptions are thrown during the video processing tasks.
Any help or suggestions on how to resolve this issue and enable new window creation during video processing would be greatly appreciated. Thank you !