Cannot Play mp4 files

[TheDreadPirate]

Uncheck both HEVC Rext boxes.

For the record, you are probably still transcoding the video you were having issues with. But the video is now being decoded by the CPU instead of the GPU. That's what those boxes at the top control. Which codecs the GPU will DEcode. If unchecked, the CPU will DEcode the video instead of the GPU. But only when transcoding.

AFAICT, your GPU does not support MPEG4 decoding. Not sure which, if any, Nvida GPU can based on their matrix.

https://developer.nvidia.com/video-encod...matrix-new