[HELP] the speed changes

[david]

Okay, video definitly is vfr.

Frame rate mode : Variable
Frame rate : 29.970 fps
Minimum frame rate : 28.571 fps
Maximum frame rate : 30.000 fps

So Hybrid should already extract the time codes.

Try whether enabling "Config->Decoding->CFR output" helps.

File size : 73.7 MiB
Duration : 35s 893ms

doesn't seem like such a huge size,..

Cu Selur

CFR out put didn't help.
actually I try in this file because it is not huge. 
other files I have are about 6mins and 1.3 G size if I try on this files it takes 1h to encode them.