KMPlayer has an option. But did not seem to be working.
http://www.kmplayer.com/forums/showthread.php?t=8204
says that the latest version seems to do it.
Also
http://forum.doom9.org/archive/index.php/t-86818.html
says ffmpeg can do it.
From
http://ffmpeg.org/ffmpeg.html#Main-options
the -y option means overwrite without asking.
But simplest is Virtualdub,
http://www.samuelpean.com/how-convert-video-file-image-sequence/
showed the way using File -> Export -> Image Sequence.
In Virtualdubmod, the menu item is File -> Save image sequence
For exporting the video as an image sequence for tgawarper, I need not bother about aspect ratio - tgawarper will warp it anyway in the correct manner if the frame contains a fisheye view with no black edges.
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