[LigH]

Always the same mistake: The resolution alone is not the relevant attribute of a video. There is still a wide variety of possible container and content formats which could be used to store video with such a resolution. Use MediaInfo to tell us relevant technical attributes.

And if you have issues, tell us about the nature of these issues as verbose as necessary. A minimum requirement is quoting an error message letter by letter, if there is any, possibly even providing a log file. "I'm having issues" is not a sufficient description.

If the conversion crashes for downloaded moviez, you are left at your own peril.

In any case, it would be off-topic in a thread related to the x265 encoder, the reason for issues is usually rather the decoding than the encoding. You may have created a separate thread instead because it happens for more than one converter application.