A n00b way to do it
PHP Code:
A = FFVideoSource("D:\App\youtube-dl\S2_E09_clip.mkv").TFM().TDecimate().ConvertToRGB32(matrix = "Rec601")
B = ImageSource("D:\App\AVS\AVSMeter290\flintstones.png", start=0, end=10, fps=A.FrameRate, pixel_type="RGB32")
Afin = A.Trim(0, 20)
Afovr = A.Trim(20, 30)
Afout = A.Trim(30, A.FrameCount-1)
Ovr = Overlay(Afovr, B, mask=B.ShowAlpha(), opacity=0.5)
AudioDub(Afin ++ Ovr ++ Afout, FFAudioSource("D:\App\youtube-dl\S2_E09_clip.mkv"))