TImageEnIO.SaveToAVI

Declaration

procedure SaveToAVI();

Description

Saves the current image to an AVI file opened using CreateAVIFile.

It is recommended that you set Params.BitsPerSample and Params.SamplesPerPixel before calling SaveToAVI, because AVI requires all images to have the same color depth.

Demos

Example 1

// Create an AVI file from images
ImageEnView.IO.CreateAVIFile( 'D:\output.avi', 20, 'DIB ' );

// Save frame 0
ImageEnView.IO.LoadFromFile('C:\frame0.jpg');
ImageEnView.IO.Params.BitsPerSample   := 8;
ImageEnView.IO.Params.SamplesPerPixel := 1;
ImageEnView.IO.SaveToAVI();

// Save frame 1
ImageEnView.IO.LoadFromFile('C:\frame1.jpg');
ImageEnView.IO.Params.BitsPerSample   := 8;
ImageEnView.IO.Params.SamplesPerPixel := 1;
ImageEnView.IO.SaveToAVI();

etc...

// Close the file
ImageEnView.IO.CloseAVIFile();

Example 2

// Create an AVI transitioning one image to another
const
  Frames_Per_Second = 20;
  Display_Seconds   = 5;
var
  proc: TImageEnProc;
  io: TImageEnIO;
  startBitmap, endBitmap : TIEBitmap;
  i, frameCount: Integer;
  transLevel: Single;
begin
  startBitmap := TIEBitmap.Create;
  endBitmap   := TIEBitmap.Create;

  proc := TImageEnProc.Create( nil );
  io   := TImageEnIO.Create( nil );
  try
    if io.CreateAVIFile('D:\Transition.avi', Frames_Per_Second, 'cvid' ) = ieaviNOCOMPRESSOR then
      raise Exception.create( 'This compressor is unavailable!' );

    startBitmap.LoadFromFile( 'D:\image1.jpg' );
    endBitmap.LoadFromFile( 'D:\image2.jpg' );

    // Call PrepareTransitionBitmaps once
    proc.PrepareTransitionBitmaps(startBitmap, endBitmap, SelectedTransitionEffect);

    frameCount := Display_Seconds * Frames_Per_Second;

    for i := 0 to frameCount - 1 do
    begin
      // We want levels from 0% to 100% (show start and end)
      transLevel := 100 / ( frameCount - 1 ) * i;

      // Call CreateTransitionBitmap for each required frame
      proc.CreateTransitionBitmap( transLevel, io.IEBitmap );
      io.SaveToAVI();

      Caption := IntToStr( Round( i / frameCount * 100 )) + '%';
    end;

    io.CloseAVIFile();
    Caption := 'Done!';

  finally
    startBitmap.Free();
    endBitmap.Free();
    proc.Free();
    io.Free();
  end;
end;

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