[HELP] the speed changes

[david]

Since you don't want to share a debug output of what you are doing, nor a sample, which would alliw me to reproduce the issue, I don't know how I could help any further.

it works. I disabled the last things you said and enabled just the CFR output and it worked. thank you so much.
just one more question.I changed the encoding mode to specific filesize/bitrate(2-pass), and put the bitrate on 1000. the encoded file speed is fine, but when i want to move the film a little forward or backward it goes 4 or 5 second around of that section. in constant rate factor mode this is not happening. how can I fix this?