Periodic frame drop (~1 frame every ~2 s) on Android client at 2560x1600 despite clean host/network stats

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Đánh giá

Độ khó
4/5
Thời gian dự kiến
3-5 ngày
Mức phù hợp với người mới
35/100
Loại issue
Lỗi
Độ rõ ràng
Khá rõ ràng
Mức độ hoạt động
Sôi nổi
Công nghệ
cpp
Lĩnh vực
backend, performance

Hướng nghiên cứu

Start by examining the attached Sunshine log and the frame pacing, encoding, and packet pacing paths; the report does not identify a specific source file or test. Compare the client’s incoming and rendering rates with the host’s frame timing to locate where the roughly 0.49 FPS gap is introduced. Done means identifying a reproducible cause and confirming that rendering keeps pace without periodic hitches.

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Mô tả

Is there an existing issue for this?
  • I have searched the existing issues
Is your issue described in the documentation?
  • I have read the documentation
Is your issue present in the latest beta/pre-release?

None

Describe the Bug

Streaming to a Samsung Galaxy Tab S9 FE+ (Moonlight Android, HEVC, 2560x1600) shows a short hitch/stutter every ~2 seconds. Once host-side problems were fixed (below), the Moonlight stats overlay is clean everywhere except one line: the client renders ~0.49 fewer frames per second than it receives.

Typical overlay (Moonlight 60 FPS / Balanced / 100 Mbps, game capped at 30 FPS with vsync):

Video stream: 2560x1600 30.00 FPS
Decoder: c2.exynos.hevc.decoder
Incoming frame rate from network: 30.00 FPS
Rendering frame rate: 29.51 FPS
Frames dropped by your network connection: 0.00%
Average network latency: 2 ms (variance: 0 ms)
Host processing latency min/max/average: 5.1/7.6/6.1 ms
Average decoding time: 11.08 ms

The "incoming minus rendering" gap is ~0.49 FPS in every configuration I tried:

Config Incoming Rendering Gap
Stream 60 FPS, Balanced, game ~24-29 FPS 29.36 / 23.90 28.87 / 23.41 0.49 / 0.49
Stream 30 FPS, Smoothest video, 30 Hz host display 30.02 29.54 0.48
Stream 60 FPS, Balanced, 60 Hz host display 30.00 29.51 0.49

That's about one dropped frame every ~2 s, which matches how often the hitch is visible. The gap stays the same at different content frame rates (24 vs 30 FPS), so it looks like a fixed-period event rather than a clock-rate mismatch.

Things that did NOT fix it:

  • Tablet Motion smoothness Adaptive (90 Hz) vs Standard (60 Hz)
  • Frame pacing: Balanced, Smoothest video, Lowest latency
  • Stream 30 vs 60 FPS; host virtual display 30 vs 60 Hz
  • Apollo 0.4.6 + Artemis 20.2.6 instead of Sunshine + Moonlight (same symptom)
  • 50 Hz ping from host to tablet while idle: median 2 ms, no periodic spikes

Host-side problems I found and fixed along the way (in case they're relevant):

  • With HAGS on, realtime NVENC priority + VRAM ~90% gave NvEnc: frame N encode wait timeout freezes (matches #1031). Setting nvenc_realtime_hags = disabled stopped those, but then the stream fell to ~20 FPS with 75-100 ms host latency whenever the game pinned the GPU at 100%. Turning HAGS off in Windows (Sunshine back to realtime priority) fixed it: 30 FPS, ~6 ms host latency.
  • The host Ethernet links at only 100 Mbps, so a 100 Mbps bitrate at a 30 FPS stream saturated it. Now kept at ~55 Mbps on the wire (60 FPS stream, 30 FPS content).

Main question: is this ~2 s periodic client-side drop a known issue with Exynos decoders / Samsung tablets, or is there a host-side setting (frame pacing, minimum_fps_target, packet pacing) that would avoid it? If it belongs in moonlight-android instead, please say so and I'll move it.

Expected Behavior

Rendering frame rate equals incoming frame rate (30.00 / 30.00), with no periodic hitches, given 0% network loss and stable host latency.

Additional Context
  • Client: Samsung Galaxy Tab S9 FE+ (Exynos 1380, 12.4" 2560x1600 90 Hz LCD), Moonlight Android (latest from Play Store), 5 GHz Wi-Fi (channel 149), decoder c2.exynos.hevc.decoder
  • Host is a hybrid laptop: internal panel on Intel iGPU, HDMI and the virtual display on NVIDIA
  • Virtual display: MikeTheTech Virtual Display Driver 25.7.23, pinned to the RTX 4050, 2560x1600 @ 30/60/90/120 Hz
  • Game: Crimson Desert, capped at 30 FPS (NVIDIA app Max Frame Rate) with vsync on; GPU ~85%
  • Controller: DualSense over Bluetooth on the host
Host Operating System

Windows

Operating System Version

Windows 11 Home 10.0.26200

Architecture

amd64/x86_64

Sunshine commit or version

2026.914.233613 (commit 63d35f702ee9e362e43263742981836ec0710384)

Package

Windows - installer (recommended)

GPU Type

NVIDIA

GPU Model

NVIDIA GeForce RTX 4050 Laptop GPU (6 GB) + Intel UHD Graphics (i5-13420H), HP Victus 15-fa1xxx

GPU Driver/Mesa Version

32.0.16.1742 (617.42)

Capture Method

Desktop Duplication API (default)

Config
adapter_name = NVIDIA GeForce RTX 4050 Laptop GPU
output_name = {9acddf6d-43cc-576e-9aff-0c5fc80b4cc8}
dd_configuration_option = ensure_only_display
dd_resolution_option = auto
dd_refresh_rate_option = auto
dd_hdr_option = auto
encoder = nvenc
nvenc_preset = 1
nvenc_twopass = quarter_res
nvenc_realtime_hags = disabled

(HAGS is now off in Windows, so Sunshine logs "Using realtime GPU priority".)

Apps

Desktop; Crimson Desert via steam://rungameid/3321460 (detached)

Relevant log output
[2026-10-19 00:25:20.520]: Info: Active GPU has HAGS disabled
[2026-10-19 00:25:20.520]: Info: Using realtime GPU priority
[2026-10-19 00:28:34.674]: Info: Display refresh rate [60Hz]
[2026-10-19 00:28:34.674]: Info: Requested frame rate [60/1 exactly 60 fps]
[2026-10-19 00:28:55.450]: Error: NvEnc: frame 1113 encode wait timeout   <- only during game load
[2026-10-19 00:30:27.213]: Error: NvEnc: frame 4012 encode wait timeout   <- none after this; stutter continued
[2026-10-19 00:35:30.579]: Info: CLIENT DISCONNECTED

Full log attached: sunshine.log

sunshine.log

Expected Behavior

No response

Additional Context

No response

Host Operating System

Windows

Operating System Version

Windows 11 OS Build 26200.9711

Architecture

amd64/x86_64

Package

Windows - exe installer

GPU Type

NVIDIA

GPU Model

RTX 4050 MOBILE GPU

GPU Driver/Mesa Version

32.0.16.1742 (617.42)

Capture Method

Desktop Duplication API (Windows)

Apps
Log output
please see the attached log file for the full logs
Online logs

No response

Ngôn ngữ chính
C++
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