My purpose is extract one cell called cell 1 (by pgcdemux) to m2v,sup..., than re-encode m2v (to put my logo in it), after that mux this m2v, sup.. back to vob file, than replace cell 1 by this vob ( by vobblanker). But I got a litle problem. Here is exactly that i do:

This is my orginal DVD



And you can see duration of cell 1 is 10'58s, but i just one to replace a part of this cell, so i click to split, then spilt this cell (only split, dont add program and chapter). After that i got:



Then apply and process is by Vobblanker, the new DVD(called DVD2) is fine, no problem.
Here is DVD2 in PGCedit


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Assume i'll reencode and replace cell number 3, i demux this cell by pgcdemux



Then i got m2v,sup,ac3...
After that, i use muxman to mux them back (please note, i'm using original m2v,sup,ac3... that demuxed by pgcdemux, dont reencode anything, i do this because i want to sure problem is not from my encoding process) and i got:



Now i open the new DVD in VobBlanker then replace cell number by VTS_01_1.VOB, then i got a new DVD again(called DVD3). Load it to PGCedit



is different with DVD2 at cell 3 and 4, i change it to make it same with DVD2, and i have:



But the problem is, when play DVD2, every is ok like original DVD, but when play DVD3, it doesnt smooth at start and endtime of cell 2,3 (cells that created by split from one original cell), seem it have some pause (about 200-500ms) .
I dont know why and dont know how to fix it.
Could you please help me
Thank you so much.