10.07.2019, 19:20
As a side note: I only get thumbnails for H.264, but not HEVC mp4 files here, independent whether I use 'ffmpeg (NVEnc)' or 'NVEncC' as encoder.
That said iirc Icaros (https://www.videohelp.com/software/Icaros) could be used to add those thumbnails, but since you mentioned that it works for you with 'ffmpeg (NVEnc)' and HEVC (or in general with StaxRip, which also uses NVEncC iirc.) you might already have some additional Explorer extension supports HEVC.
Cu Selur
That said iirc Icaros (https://www.videohelp.com/software/Icaros) could be used to add those thumbnails, but since you mentioned that it works for you with 'ffmpeg (NVEnc)' and HEVC (or in general with StaxRip, which also uses NVEncC iirc.) you might already have some additional Explorer extension supports HEVC.
Cu Selur