6x4 GIF89a controls; middle disposal changes among 0/1/2/3. White global background and transparent index 4. Delay list 300,120,400 ms. Supplied comparison is from Pillow12.3/ImageMagick7.1.2; independent-rerun uses Pillow12.3/ImageMagick6.9.12. Transparent RGBA and white-matte appearance are different references.

Synthetic examples created for ExtractVideoFrames.com. Original example media and illustration data: CC0. FFmpeg, Python, Pillow and ImageMagick are separate tools with their own licenses. Source programs do not delete existing directories; use a new working folder. No private media is included.
