[a4840639]

Whatever idiot is encoding this VFR H265 stuff in not taking enough care and just leaving Handbrake on default settings. Why you would want VFR complications in a highly compressed codec like H265 is beyond me and just leads to playback complications like we are finding. It would also likely lead to increased encoding times that are already in the order of 24-48 hours for a BD ISO Rip.

Actually, VFR is Handbrakes default setting.

have you got you glasses on T, you must have missed this bit...

Handbrake, which has been used to encode this H265, apparently foolishly defaults to VFR when encoding.

VFR has really little to do with compression rate
It is more about keep the original content in the format that it is supposed to be
If the original source is "VFR" in its nature, you have basically these choices:
1. Keep the video interlaced as the source. Most people probably do not want this because the quality of deinterlace in playback time is normally quite low, it also causes tons of trouble for config and hardware support.
2. Target one frame rate, ignore the other. This will make some part of the video choppy because frames are dropped.
3. Convert frame rate, normally through frame blending algorithm. This will result very bad picture quality and the process of frame rate conversion is not. reversible.
4. Makes everything 60p. This solution will waste a lot of bit rate. In addition, the playback of 60p is always much more demanding than the playback of 24p/30p.
5. VFR, which is neither harmful to video quality nor waste bit rate