Three verification deliverables; no production code changes
(infrastructure from 8.8 was sufficient).
1. libva-v4l2-request consumer investigation (task 95):
- bootlin/libva-v4l2-request@master supports MPEG-2 /
H.264 / HEVC only. No VP9, no AV1.
- H264 expects V4L2_PIX_FMT_H264_SLICE_RAW (older
fourcc); we advertise V4L2_PIX_FMT_H264_SLICE.
- CAPTURE expects V4L2_PIX_FMT_NV12 (single-plane);
we advertise NV12M + P010.
- Real integration = patch libva-v4l2-request to add
VP9 + AV1 mappings + accept the newer H.264 fourcc.
Multi-session work — pushed to Phase 8.10.
2. Long-form stress test (task 96):
- Built a 1800-frame (60s @ 30fps) VP9 1080p stream
by Python concat of vp9_5s.ivf × 12 with PTS
adjustment and re-muxed IVF header.
- 1800 / 1800 frames decoded cleanly through
test_m2m_stream + daemon, fps=120.9 sustained
across 14.9 s wall, p99=17.3 ms/frame (well inside
the 33 ms 30fps budget).
- Daemon alive after 3620 cookies across two
back-to-back runs, RSS=23 MiB — no leak.
- No kernel oops/WARN, no fps degradation across
the long run.
3. Multi-codec HDR (task 97):
- AV1 1080p 10-bit → P010: byte-exact vs ffmpeg
p010le. fps 17.1 (below 30fps target; AV1 10-bit
is intrinsically expensive).
- H.264 1080p 10-bit (high10) → P010: byte-exact
vs ffmpeg p010le. fps 26.9 (close to target).
- Combined with 8.8's VP9-10bit P010 result
(48.8 fps): all three codecs' 10-bit paths
produce byte-exact P010 output.
Roadmap update (docs/roadmap.md):
- 8.9 marked closed with the scope-cut explained.
- 8.10 = libva-v4l2-request VP9/AV1 patch + end-to-end
consumer integration (the actual user-facing loop:
mpv --hwdec=vaapi → libva-v4l2-request → /dev/video0
→ daemon → decoded frame).
Per correctness-before-speed: characterised the libva
integration scope rigorously rather than starting a
multi-session battle in this phase. The bounded
deliverables (stress test + HDR matrix) ship clean and
prove the existing infrastructure handles real-world
workloads stably.
Phase 8.10 next: build + patch libva-v4l2-request on
hertz; end-to-end with mpv.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
