I see 5 videos in the log:
1.
Media: video 1920x1080 [PAR 1.000] at 29.970 fps [constant]
Media: codec type is AVC, YUV/4:2:0/8 bits
This video is working good without switching ro new framesrate.
2.
Media: video 1920x1080 [PAR 1.000] at 29.970 fps [constant]
Media: codec type is AVC, YUV/4:2:0/8 bits
The same. This video is working good without switching to new framesrate.
3.
Media: video 1920x1080 [PAR 1.000] at 29.970 fps [constant]
Media: codec type is AVC, YUV/4:2:0/8 bits
The same again. This video is working good without switching to new framesrate.
4.
Media: video 1280x720 [PAR 1.000] at 0.000 fps [constant]
Media: source frame rate is unknown!
Media: codec type is AVC, YUV/4:2:0/8 bits
Media: 23.976 fps (via ffdshow)
This video with 0 fps in the header of video file. MediaInfo can't get real framerate. And As we can see the video has Variable FrameRate (VFR). It consists of parts with differebt framerate.
14:59:25.133 (I): Playback [b11a8]: playing at 119.88 [23.976 *5/1]
15:00:22.860 (I): Playback [b11a8]: source frame rate changed to 30.073
15:00:22.869 (I): Playback [b11a8]: playing at 120.292 [30.073 *4/1]
I see only one switching from 23.976 to 30.073 fps and SVP need to change smoothing factor from 5/1 to 4/1 to get 120 fps at the output.
5.
Media: video 1280x720 [PAR 1.000] at 0.000 fps [constant]
Media: source frame rate is unknown!
Media: codec type is AVC, YUV/4:2:0/8 bits
Media: 23.976 fps (via ffdshow)
This video with 0 fps in the header of video file. MediaInfo can't get real framerate too. But As I can see the video is usual constant framerate (CFR) video. No switching.
So. Only One video from 5 is VFR and only with that video has switching issue because of it content.
What the video is it? Anime?