hi in virtualdub you can rotate the image in every angle not just 90-180-270 but 75, 142 or 247 etc. degrees. so can you add advanced rotating option to filters?
Video Filter Manager: OpenGl: OpenGl Rotate:
Like this perhaps: Avidemux Demo @ YouTube: Filter OpenGl: OpenGl Rotate (https://www.youtube.com/watch?v=Cm6_w13Zj6Q&index=1&list=PLLGMi2RSm8sb8I888mktm0LruahQ_gWHq)
If you have OpenGl support enabled in avidemux, and your OS does support this.