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• How can I display an image from Uint8List with the format AVFormat.RGBA8888 more quickly in Flutter ?

  27 mars, par Salawesh

  I'm looking to display images as quickly as possible. input data is in the form of Uint8List from dart:typed_data, data is encoded in AVFormat.RGBA8888 from ffmpeg.

  


  I'm looking for a solution to improve the performance of my graphics rendering code. And to see if it's possible to do it in a thread (isolate or compute).

  


  Here's my current working code.

  


      final buffer = await ui.ImmutableBuffer.fromUint8List(data.data);
    final descriptor = ui.ImageDescriptor.raw(
      buffer,
      width: data.width,
      height: data.height,
      pixelFormat: ui.PixelFormat.rgba8888,
    );
    final codec = await descriptor.instantiateCodec(); // native codec of ui.Image
    final frameInfo = await codec.getNextFrame();


  


  This is done in my main thread

  


• how i can save overlay text box with a video in gallery by using ffmpeg ?

  10 septembre 2024, par Umair Manzoor

  final escapedOverlayText = overlayText.replaceAll(''', '\'') ;
final command =
'-i $videoPath -vf "drawtext=text='$escapedOverlayText':x=10:y=10:fontsize=24:fontcolor=white" -c:a copy $outputPath' ;

  


    print('Executing command: $command');

  final session = await FFmpegKit.execute(command);
  final returnCode = await session.getReturnCode();
  print('here is errror Return code: $returnCode');


  


  that those section of code where this ffmpeg returns the following error
I/flutter ( 6329) : here is errror Return code : 1
I/flutter ( 6329) : FFmpeg failed with return code : 1

  


  i am trying to save the video with overlay text data in the gallery.

  


• python cv2 video playing quality

  10 août 2017, par TheRutubeify

  Why it is so big difference in quality between MPC-CH Windows Media Player and cv2 cv2.VideoCapture(’*.mp4’) when playing the same file ! Codec H. 264 E

  How I can improve quality with cv2 ?

  Here is the screenshot Left(cv2) Rigth(MPC-CH) :
  

  cv2.namedWindow("Final", 0)
  
  cv2.resizeWindow("Final", 300, 200)
  
  cap = cv2.VideoCapture('1.mp4')
  
  while(cap.isOpened()):
  
      qwe, frame = cap.read()
  
      cv2.waitKey(30)
  
      gray = cv2.cvtColor(frame, cv2.COLOR_BGR2BGRA) #COLOR_RGB2RGBA
  
      cv2.imshow('Final',gray)

  Any suggestions ?