- http://avisynth.nl/index.php/Main_Page
- http://avslib.sourceforge.net/
- http://www.tfcc.cn/dvdrip/2006-3-16_18-05-32_1309.html
- http://www.tfcc.cn/dvdrip/2004-9-7_15-40-21_9606.html
- http://www.tfcc.cn/dvdrip/2006-3-16_18-02-51_5420.html
utensil commented at 2015-01-14 06:13:
http://stackoverflow.com/questions/3937387/rotating-videos-with-ffmpeg