Files
punktfunk/crates/pf-encode
enricobuehlerandClaude Fable 5 f87c1e6cec
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fix(encode): gate multi-slice frames on the client's decoder — the 0.17.0 Chromecast crash
Field report: since 0.17.0 a stream to a Chromecast with Google TV 4K
freezes on the first frame and ~80% of the time crashes + reboots the
DEVICE — with both the Punktfunk app and Moonlight, while an Xbox
Series S is fine. Root cause: LN1 Phase 3 (67b79810) defaulted Linux
direct-NVENC to 4 slices per frame for EVERY session. Amlogic HEVC
decoders wedge on multi-slice AUs — exactly why moonlight-android
requests slicesPerFrame=1 for every hardware decoder (4 only for
software slice-threading) — and our RTSP parser never read the request.
The Phase-3 commit recorded the untested leg ("a live Moonlight re-test
joins the standing owed Moonlight item"); this report is that re-test.

The slicing ceiling now belongs to the CLIENT, threaded as open_video's
new max_slices from both planes:
- GameStream: parse x-nv-video[0].videoEncoderSlicesPerFrame into
  StreamConfig and honor it; absent/out-of-range (pre-auth input) => 1.
- punktfunk/1: new Hello cap VIDEO_CAP_MULTI_SLICE (0x80 — the byte's
  LAST free bit; the next cap needs a second byte + ABI bump).
  SessionPlan.max_slices = 32 with the bit, 1 without, applied to every
  encoder the plan opens so rebuilds can't change the wire shape. The
  desktop session client advertises it (FFmpeg/D3D11VA/Vulkan decode
  stacks are fine); Android/Apple stay off until they can decide
  per-decoder like Moonlight does — the cap is embedder-set decoder
  truth, never OR'd in by the shared pump.
- Linux direct-NVENC clamps its Phase-3 default to the ceiling
  (resolve_slices(codec, 4.min(max_slices))) and logs slices/max_slices
  in the caps-probe line; PUNKTFUNK_NVENC_SLICES stays the explicit
  operator override in both directions. Windows keeps its single-slice
  default untouched.

Also repairs the nvenc_cuda #[ignore] hardware tests: d2c46eaf added
open()'s cursor_blend param without updating them, invisible because CI
never compiles tests with the nvenc feature.

Verified on .21 (RTX 5070 Ti): pf-encode + host check/clippy clean with
nvenc; host unit suite 263/0; rtsp announce tests 7/7 incl. the new
slicesPerFrame coverage; on-hardware smokes — default e2e still 4
chunks/frame, NEW single-slice client-ceiling test clamps + disarms
chunked poll with no env involved, env escape unchanged. rustfmt clean.
Windows leg (prepare_display param) is CI-only.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-07-30 22:23:42 +02:00
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