No software is perfect. The development team has acknowledged three bugs in version 4.0.2:
The latest update (build 4.0.2, released October 2023) is not a minor bug fix. It is a complete overhaul of the rendering pipeline. Here are the headline features:
Let’s explore each of these in detail.
Previous versions suffered from a critical flaw: when playing anime or foreign films with ASS/SSA subtitles, the player would stutter during complex karaoke effects. h265x player updated
The fix: The new engine caches rendered subtitle glyphs in VRAM.
This is the part most users ignore, but it's critical. Older H.265 players used a vulnerable FFmpeg library (version 4.3) that allowed malicious MKV files to execute code on your PC.
The updated h265x player includes FFmpeg v6.1 with patches for: No software is perfect
Verdict: If you download torrents or surveillance footage, this update is mandatory.
Yes – but with one caveat.
If you are a casual user watching H.264 YouTube videos, you don't need this. But if you have a local 4K library, edit drone footage, or use IP cameras, the updated h265x player is the single biggest performance leap in video playback software since VLC 2.0. Let’s explore each of these in detail
The caveat: Backup your system before updating. The new subtitle renderer changes the registry key for default file associations (MKV, HEVC, MP4). Some users report losing file associations to Windows Films & TV after the update – this is fixable by right-clicking any HEVC file and choosing "Always open with H265X."
Final score: 9.2/10
Best for: Home theater PCs, video editors, security system reviewers.
Avoid if: You only watch YouTube or Netflix in a browser.