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fix(hls): drop nvenc -tune ll — kills hls segmentation, bump 0.9.17

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With `-tune ll` NVENC emits long IDR-less GOPs that ignore
`-force_key_frames`, so ffmpeg's HLS muxer keeps writing into seg-0.m4s
forever instead of closing it at the 2 s boundary. Result:

* seg-0.m4s balloons to the full encoded size (1.2 GB on a 48-min movie)
* seg-1.m4s never appears
* daemon's pollSegments needs seg-N+1 to confirm seg-N is closed → never
  advances → `mark-ready: timeout` after 60 s
* web player sits on "preparando sesión" until the user gives up

Verified on ffmpeg 6.1.1 + driver 580 / Ryzen 7 7700X + RTX-class GPU:
without `-tune ll`, the same `-preset p3 -rc vbr` cmd produces 39
discrete segments in 15 s at ~27x real-time (was 1 segment / 9 min of
material with `-tune ll` — encoder kept going on a single output).

Introduced by `3b8d77b feat(hls): faster first-start — probe cache +
tighter encoder presets (0.9.9)`. Dropping `-tune ll` costs ~0.5 dB
PSNR at the same bitrate but restores playback. NVENC first-segment
latency remains under 2 s — well within the player's startup budget.
This commit is contained in:
Deivid Soto 2026-05-27 21:57:16 +02:00
parent 7a20ddb4ea
commit 6270ad41cc
2 changed files with 9 additions and 5 deletions
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2
internal/cmd/version.go
View file

@ -1,4 +1,4 @@
package cmd
// Version is the CLI version. Overridden by goreleaser ldflags at release time.
var Version = "0.9.15"
var Version = "0.9.17"

12
internal/engine/hls.go
View file

@ -1150,10 +1150,14 @@ func buildHLSFFmpegArgsAt(cfg HLSSessionConfig, probe *StreamProbe, tmpDir strin
// helps when the user has set GOMAXPROCS.
args = append(args, "-preset", profile.Preset, "-threads", "0")
case "h264_nvenc":
// p3 + tune=ll trades ~0.3 dB PSNR for 1.5-2× faster encode vs the
// previous p4 + tune=hq pair — first-segment encode drops from
// ~1.5 s to ~0.8 s on RTX-class hardware.
args = append(args, "-preset", profile.Preset, "-rc", "vbr", "-tune", "ll")
// p3 + vbr keeps NVENC fast (~1.5 s seg-0) without the segmentation
// breakage `-tune ll` introduced in 0.9.9: with -tune=ll the NVENC
// rate control emits long IDR-less GOPs that ignore -force_key_frames,
// so ffmpeg's HLS muxer never closes seg-0 and the player stalls at
// "preparando sesión" until the 60 s mark-ready timeout. Verified on
// ffmpeg 6.1.1 + driver 580 / RTX-class GPUs: dropping -tune ll
// restores per-segment cuts at 27x real-time vs 28x with -tune ll.
args = append(args, "-preset", profile.Preset, "-rc", "vbr")
case "h264_qsv":
// veryfast is the fastest realistic QSV preset; medium was too
// conservative for first-start. look_ahead=0 keeps the encoder