I’m experiencing similar problems to Joe24 when using Davinci Resolve Studio. It only happens when using Nvenc HEVC or Nvenc H.264 as the codec. I get some videos that only play audio and still images when seeking. But I also get videos that’ll play but freeze at points when playing. Some videos appear to play correctly.
If I uncheck export audio in Resolve, all output videos will play okay. Like Joe24, when downgrading to Voukoder version 13, there are no problems.
Yes, in Davinci Resolve Studio I also saw sometimes rendered output videos not playing.