Server Version#:1.43.1.10611
Player Version#: Roku Premiere Version 15.1
System:
- Intel i7-14700K (Intel UHD Graphics 770)
- NVIDIA RTX 5070
- ASUS TUF Gaming Z790-PLUS WIFI
- Windows 11 Pro (fully updated)
- Plex Media Server (latest version)
Issue:
Intel Quick Sync hardware transcoding is unstable and does not stay engaged.
Behavior:
- Playback initially shows (hw)
- Within seconds it drops back to normal transcode
- Sometimes playback becomes unstable or stops
- Behavior is inconsistent across attempts
What works:
- Direct Play = perfect
- NVIDIA GPU transcoding = works perfectly
- Software transcoding = works perfectly
What does NOT work:
- Intel Quick Sync does not stay active
Troubleshooting completed:
- Clean install of latest Intel graphics driver (from Intel website, clean install option used)
- Verified Intel UHD 770 active in Device Manager
- Disabled Windows automatic driver overwrite during testing
- BIOS settings:
- Primary Display: PEG Slot
- iGPU Multi-Monitor: Enabled
- DVMT Pre-Allocated: 256MB
- Hardware acceleration enabled in Plex
- Hardware-accelerated encoding enabled
- Tested with:
- Intel UHD 770 manually selected
- Auto selection
- Multiple files tested:
- 4K HEVC
- 1080p H264
- Forced lower quality playback (SD/720p) → same issue
Observed behavior:
- (hw) appears briefly, then disappears
- Falls back to CPU or unstable transcode
- Happens even with simple 1080p H264 files
Additional context:
- This is a brand new system built specifically for Plex and Intel Quick Sync
- I normally use AMD systems, but switched to Intel specifically for Quick Sync support
- System is otherwise completely stable
- Network is local and stable
Looking for:
- Known issues with UHD 770 / 14th gen CPUs
- Known Roku client limitations
- Any required Plex settings beyond standard hardware acceleration
- Whether this is a Plex issue or Intel driver / Windows interaction
I can provide logs if needed.
