Why are not orginal frame and encoded frame asynchronous ?

[thuongshoo]

Look
this picture (http://www.box.net/public/b2ig97l1uc)
Why ?
Thanks !

[foxyshadis]

The magic of directshow, in which seeking is never guaranteed and rarely very accurate with most splitters. And depending on how you encoded it may have dropped or added a frame, although in mp4 it shouldn't have. Try writing it back out to a lossless avi and compare the frames then, that'll show you that it's just a seeking issue.

[thuongshoo]

Try writing it back out to a lossless avi and compare the frames then, that'll show you that it's just a seeking issue.
I will try. How can I do to avoid this thing ?
Thanks ! foxyshadis ! You're always ready to answer my questions. Thank !:)

AVS file

loadplugin("c:\program files\avisynth 2.5\plugins\unfilter.dll")
DGDecode_mpeg2source("E:\S.E.S. - 3rd Album Medley (MBC 021200)_3.d2v",info=3)
ColorMatrix(hints=true)
#Not doing anything because the source is progressive
#crop
#resize
#Undot() # Minimal Noise
FluxSmoothST(7,7)
#Convolution3D("movielq")
#Addgrain(4, 0.2, 0.3)
#unfilter(20,20)
trim(0,600)