VirtualDub

There are lots of programs that let you "edit" video. And yet, they're frustratingly complex for some of the simplest tasks. VirtualDub isn't an editor application; it's a pre- and post-processor that works as a valuable companion to one:
Reads and writes AVI2 (OpenDML) and multi-segment AVI clips.
Integrated MPEG-1 and Motion-JPEG decoders. Remove and replace audio tracks without touching the video. Extensive video filter set, including blur, sharpen, emboss, smooth, 3x3 convolution, flip, resize rotate, brightness/contrast, levels, deinterlace, and threshold. Bilinear and bicubic resampling -- no blocky resizes or rotates here. Decompress and recompress both audio and video. Remove segments of a video clip and save the rest, without recompressing. Adjust frame rate, decimate frames, and 3:2 pulldown removal. Preview the results, with live audio.
You can take a captured clip, trim the ends, clean up some of the noise, convert it to the proper frame size, and write out a better one. Don't see a video filter you want? Write your own, with the filter SDK.
Build 23604 (1.6.9, stable): [July 10, 2005]
[bugs fixed]
* Extended workaround for Huffyuv joining problems to capture mode
(pre-zeroing format block).
* Hex editor would warp to a random location when using the mouse wheel for
the first time.
* Currently displayed frame was not updated after a reload (F2).
* Fixed errors when opening YCbCr (YUV) videos that had nonstandard bit
depth or image size values in the frame header.
* YV16 input is now supported; previously it could be written but not
re-read.
[regressions fixed]
* Fixed sporadic audio compression errors at end of render.