Greetings,

Please read this thread, especially the bottom:

http://forums.virtualdub.org/index.php?act=ST&f=6&t=16341&s=38327af52d523512a0b3cdb11e9269d9

In summary, btwincap/huffyuv seem to be consistently dropping exactly 136 frames in the capture programs
tested without reporting it (does DirectShow do this?) to the applications.

Help much appreciated.