Wav2Lip & Ultralight custom models idle state (animation)?

[SuperMaximus1984]

Hi! Author mentioned in readthedocs that
The test results are average, mainly because the mouth is unstable when not speaking. If there is anything wrong, please give suggestions
But in fact the same happens in Wav2Lip custom avatar generated by
python genavatar.py --video_path xxx.mp4 --img_size 256 --avatar_id wav2lip256_avatar1
When idle - the avatar animation keeps playing with lips moving. In case of Ultralight it's a bit better, but not ideal - the lips are not moving, but the mouth is not shut.
Which part of code is responsible for idle avatar?
Thank you!