FFEncoder PreviewBitmapEvent

PreviewInfo

  TPreviewInfo = record
    TaskIndex: Integer;     // index of converting tasks
    Bitmap: TBitmap;        // bitmap filled with the target video picture, you can save it,
                            //  or paint it on any canvas(or any other control) which you want.
    FrameNumber: Integer;   // frame index number, first is 1 not 0
    PTS: Int64;             // presentation time stamp of current picture, in microseconds
  end;

PreviewBitmapEvent

  // only triggered with property PreviewBitmap = True
  TPreviewBitmapEvent = procedure(Sender: TObject; const APreviewInfo: TPreviewInfo) of object;