Thanks. Short tested in V6.2 frame interpolations with different output codec and models. Input test-file was 25fps h264 mp4, produced no VFR. Output was set to 50fps, everything fine. Then I took FFV1 source and did Aion 50fps and MediaInfo shows VFR. The same file with MKVToolnix remuxed into MKV container and Mediainfos says it’s constant framerate, as it should be.
So TVAI produces no VFR but something happens wrong with container tags, pending on input file codec/format. It’s not a big problem, but when other programs reads out fps from container, worse things could happen. To reproduce import ffv1 source into TVAI, do frame interpolation and check result with MediaInfo.
Left shows VFR with crazy max fps, on the right the same video after remuxed into mkv shows CFR
