If the error is still present: Please tell me exactly how to reproduce it! And with which player incl. version number it is not playable with.
I was wrong saying unchecking export audio always fixes it in Resolve. I’ve been downloading a bunch of stock clips to see if I can find a short video that doesn't play correctly when exported.
This one is the shortest I found. The video is only 5 seconds and has no audio, but the output video still has the problem. This time unchecking export audio in Resolve didn't change anything.
https://mixkit.co/free-stock-video/one-on-one-in-a-soccer-game-43483/
I downloaded the Full HD version.
I dragged it into a 1920x1080 23.976 fps timeline in Davinci Resolve Studio (18.1.4). Exported with Nvenc H.264 or Nvenc HEVC (both have the problem), applying the default preset. Audio and output container on default AAC (FFmpeg) and mp4.
The output video freezes on the first frame or shows nothing until seeking in the following apps on my PC.
VLC Media Player (3.0.18 64-bit)
Films & TV app
Windows Media Player
It plays fine in MPC-BE
It freezes on my android tablet and phone in VLC player for android but plays in the gallery app.
I should be clear that not all of my exports come out broken. That seems to be different to those using Vegas? Some will come out fine. When I get a problem export, it doesn't matter how many times I render, it'll always come out that way.
I'm on Windows 10. Downgrading to Voukoder 13 and the problem goes away.