phase 0 close: deliverables 5 + 6 — fixtures + cross-validator anchor
Closes Phase 0 for fresnel-fourier. Per-codec test fixtures and cross-validator contract traces complete the campaign-locked boolean-correctness baseline. Deliverable #5 — per-codec test fixtures (test_fixtures.md): Generated 4 new fixtures on fresnel from the bbb_1080p30_h264.mp4 master via stock ffmpeg (libx265 ultrafast, libvpx-vp9 speed 5, mpeg2video, libvpx vp8). All 720p 10s 8-bit yuv420p — matching the silicon-supported profile/pixfmt for each codec on RK3399: bbb_720p10s_hevc.mp4 620 KB (HEVC Main, rkvdec target) bbb_720p10s_vp9.webm 3.4 MB (VP9 Profile 0, rkvdec target) bbb_720p10s_mpeg2.ts 5.3 MB (MPEG-2 Main, hantro-vpu-dec target) bbb_720p10s_vp8.webm 2.4 MB (VP8, hantro-vpu-dec target) Encode wall times on fresnel: HEVC 13s, VP9 93s, MPEG-2 6s, VP8 26s. H.264 master is 725 MB carryover from libva-multiplanar / fourier_attribution. Deliverable #6 — cross-validator anchor (cross_validator_traces.md): phase0_findings.md named chromium-fourier 149 as the cross-validator; that package isn't installed on fresnel and marfrit-packages isn't configured (no auto-install path tonight). Substituted ffmpeg -hwaccel v4l2request as a better-fit cross-validator: it's an independent V4L2 client (uses no libva at all, lives in libavcodec/v4l2_request*.c), already on the box (stock ffmpeg n8.1-13-gb57fbbe50c, the Kwiboo v4l2-request-n8.1 branch), and implements all 5 codecs the campaign locked. Headline finding: ALL 5 CODECS WORK end-to-end via the kernel direct path on RK3399. ffmpeg -hwaccel v4l2request -i bbb_<codec>.<ext> -frames:v 2 -f null - H.264: exit 0 HEVC: exit 0 VP9: exit 0 MPEG-2: exit 0 VP8: exit 0 The Linux kernel + rkvdec + hantro-vpu drivers are solid for the entire campaign codec scope. Phase 6 work scope is purely libva- backend code — no kernel patches, no upstream Linux engagement. Per-codec libva (iter8) vs ffmpeg-v4l2request status sweep: H.264 libva: PASS (T4 PASS + bit-exact pixel verify) | ffmpeg-v4l2req: PASS HEVC libva: vaCreateConfig=12 (UNSUPPORTED_PROFILE) | ffmpeg-v4l2req: PASS → src/h265.c is excluded in src/meson.build but src/config.c:151 enumerates HEVCMain via V4L2_PIX_FMT_HEVC_SLICE probe; vaCreateConfig fails downstream of the case match. VP9 libva: profile not enumerated | ffmpeg-v4l2req: PASS → no vp9.c in fork MPEG-2 libva: vaCreateConfig=12 (UNSUPPORTED_PROFILE) | ffmpeg-v4l2req: PASS → mpeg2.c IS compiled, config.c:64-65 has the case statements, yet vaCreateConfig rejects. Phase 2 source-read needed. VP8 libva: profile not enumerated | ffmpeg-v4l2req: PASS → no vp8.c in fork Suggested Phase 6 iteration order (subject to Phase 1 lock): iter1: MPEG-2 — likely cheapest (config.c-level path; mpeg2.c already compiled) iter2: HEVC — re-enable h265.c in build, audit against rkvdec iter3: VP8 — implement vp8.c on hantro iter4: VP9 — implement vp9.c on rkvdec (largest control surface) Per-codec ioctl frequency anchor (2-frame ffmpeg -hwaccel v4l2request): ioctl H.264 HEVC VP9 MPEG-2 VP8 VIDIOC_DQBUF 45 49 40 26 49 VIDIOC_QBUF 22 24 20 10 20 VIDIOC_CREATE_BUFS 17 17 17 12 17 VIDIOC_QUERYBUF 15 15 15 10 15 VIDIOC_S_EXT_CTRLS 13 14 11 5 10 VIDIOC_EXPBUF 11 11 11 6 11 VIDIOC_QUERY_EXT_CTRL 0 5 0 0 0 MEDIA_IOC_REQUEST_ALLOC 4 4 4 4 4 DMA_BUF_IOCTL_SYNC 0 0 0 4 0 MEDIA_REQUEST_IOC_REINIT 0 0 0 0 3 Architectural divergence ffmpeg-v4l2request vs libva-v4l2-request-fourier: - ffmpeg uses VIDIOC_EXPBUF + DMA-BUF for downstream readback. Our libva backend uses cached mmap via vaDeriveImage — the iter1 patch-0011 cache-stale bug class. Phase 4 work item consistent with T4's finding: adding VIDIOC_EXPBUF + DMA-BUF- backed image export to the libva backend would fix the cache-coherency issue identified in T4's H.264 readback. - ffmpeg uses 4 request_fds pooled. Our backend uses 16 (iter6 per-OUTPUT-slot binding). Both valid; different pool depth. - HEVC alone needs VIDIOC_QUERY_EXT_CTRL for hevc_slice_params dynamic-array introspection — unique among the 5 codecs. Substrate change deferred (not a Phase 0 blocker): chromium-fourier 149 install on fresnel is Phase 1+ work. When done, a follow-up trace pass per codec will cross-check ffmpeg-v4l2request and chromium contracts. For Phase 0 baseline, ffmpeg-v4l2request is the anchor. Phase 0 fully closed. Six deliverables landed. Phase 1 lock can proceed. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
@@ -0,0 +1,171 @@
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# Cross-validator contract traces (per-codec) — fresnel 2026-05-07
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Phase 0 deliverable #6. Per-codec V4L2 + media-request contract traces captured from an **independent V4L2 client** consuming each fixture, to validate (a) the kernel + driver path works for every locked codec and (b) anchor what V4L2 traffic per codec should look like for Phase 6 implementation work in the libva backend.
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## Substrate change vs the locked deliverable
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`phase0_findings.md` and `README.md` named **chromium-fourier 149** as the cross-validator. chromium-fourier is **not installed** on fresnel as of 2026-05-07 (`pacman -Ss chromium-fourier` returns nothing; only stock `chromium 147.0.7727.116-1` and `brave-bin 1.87.191-1`). The `marfrit-packages` repo is also not configured on fresnel (`grep -A3 "marfrit\|reauktion" /etc/pacman.conf` empty), so binary distribution to fresnel is currently manual.
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**Substituted cross-validator: `ffmpeg -hwaccel v4l2request`** (ffmpeg `n8.1-13-gb57fbbe50c`, the `v4l2-request-n8.1` Kwiboo branch already in stock ALARM).
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Rationale — this is actually a **better** cross-validator than chromium-fourier 149 for fresnel-fourier's purposes:
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- **Different V4L2 client code path.** ffmpeg's `v4l2request` hwaccel lives in `libavcodec/v4l2_request*.c`. It uses no libva at all — it's a direct V4L2 + media-request consumer. So it cross-validates our libva backend's kernel-side traffic against an independent implementation, exactly the cross-validation function chromium-fourier 149's `media/gpu/v4l2/` was supposed to provide.
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- **Already on the box.** No package install dance, no version locking exposure.
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- **All five codecs implemented.** ffmpeg has `mpeg2_v4l2request`, `h264_v4l2request`, `hevc_v4l2request`, `vp8_v4l2request`, `vp9_v4l2request` decoder paths. chromium might or might not — irrelevant since we're not testing it.
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The chromium-fourier 149 cross-validator is **not lost** as a Phase 1+ goal — once chromium-fourier is installed on fresnel via the standard marfrit-packages bootstrap, a follow-up trace pass per codec will cross-check ffmpeg-v4l2request and chromium contracts. For Phase 0 baseline, the ffmpeg-v4l2request anchor is sufficient.
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## Headline finding: all 5 codecs work via the kernel direct path
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```
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$ ffmpeg -hwaccel v4l2request -i bbb_<codec>.<ext> -frames:v 2 -f null - ; echo "[exit $?]"
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H.264 → exit 0
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HEVC → exit 0
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VP9 → exit 0
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MPEG-2 → exit 0
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VP8 → exit 0
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```
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**Every locked codec on fresnel decodes end-to-end** when consumed via `ffmpeg -hwaccel v4l2request`. The Linux kernel + rkvdec + hantro-vpu drivers on RK3399 are solid for the campaign codec scope.
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This dramatically shrinks the Phase 6 fork-side work scope: nothing needs fixing in the kernel. Every Phase 6 work item is in the libva backend (config.c profile validation, codec source files, control submission, image export).
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## Per-codec status: libva (our backend, iter8) vs ffmpeg-v4l2request
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Run via `mpv --hwdec=vaapi-copy ...` (libva path) and `ffmpeg -hwaccel v4l2request ...` (direct V4L2 path), 2 frames each:
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| Codec | libva via iter8 | ffmpeg-v4l2request | Diagnosis |
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|---|---|---|---|
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| **H.264** | ✅ HW decode, pixel-perfect via DMA-BUF (T4) | ✅ exit 0 | Both paths work; campaign cell **passes**. |
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| **HEVC** | ❌ `vaCreateConfig: 12 (UNSUPPORTED_PROFILE)` | ✅ exit 0 | `src/h265.c` excluded from build (commented out in `src/meson.build`); `src/config.c:151` enumerates HEVCMain anyway because the V4L2 probe of `V4L2_PIX_FMT_HEVC_SLICE` succeeds. Phase 6 fix: re-enable h265.c in build, audit it against rkvdec HEVC kernel contract. |
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| **VP9** | ❌ `No support for codec vp9 profile 0` (not enumerated) | ✅ exit 0 | No `vp9.c` in fork at all. Phase 6 fix: write VP9 source file, model on FFmpeg's `v4l2_request_vp9.c` and kernel `rkvdec_vp9.c`. |
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| **MPEG-2** | ❌ `vaCreateConfig: 12 (UNSUPPORTED_PROFILE)` | ✅ exit 0 | `mpeg2.c` IS compiled in fork. `src/config.c:64-65` has both VAProfileMPEG2Simple/Main cases. Yet vaCreateConfig fails. Suspects: device-discovery / V4L2 capability check in `RequestCreateConfig` runtime path; or a regression in mpeg2 path between Bootlin upstream and fork tip; or a routing-by-codec issue (the libva backend was bound to /dev/video5 via env var, but maybe the codec dispatch checks the wrong format list). Phase 2 source-read of config.c needed before Phase 6 implementation. |
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| **VP8** | ❌ `No support for codec vp8 profile -99` (not enumerated) | ✅ exit 0 | No `vp8.c` in fork. Same shape as VP9: model on FFmpeg's `v4l2_request_vp8.c` and kernel `hantro_vp8.c`. |
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So the boolean-correctness-per-codec scoreboard for Phase 0 is:
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| Codec | Phase 0 boolean correctness | Phase 6 work item |
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|---|---|---|
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| H.264 | ✅ PASS | (already works; pixel-cache-coherency on vaDeriveImage path is a side issue — see T4 writeup) |
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| HEVC | ❌ FAIL via libva, ✅ kernel-side OK | enable h265.c build + audit |
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| VP9 | ❌ FAIL via libva, ✅ kernel-side OK | implement vp9.c |
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| MPEG-2 | ❌ FAIL via libva, ✅ kernel-side OK | debug RequestCreateConfig MPEG-2 rejection |
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| VP8 | ❌ FAIL via libva, ✅ kernel-side OK | implement vp8.c |
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Phase 1 lock can take this directly: each codec is a separate iteration's binding cell, ordered by complexity (MPEG-2 likely cheapest if it's just a config-side bug, VP9 likely most expensive given the kernel control surface).
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## Per-codec ioctl frequency (cross-validator anchor)
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From `strace -ff -tt -y -e ioctl` on `ffmpeg -hwaccel v4l2request` decoding 2 frames each:
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| ioctl | H.264 | HEVC | VP9 | MPEG-2 | VP8 |
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|---|---|---|---|---|---|
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| VIDIOC_DQBUF | 45 | 49 | 40 | 26 | 49 |
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| VIDIOC_QBUF | 22 | 24 | 20 | 10 | 20 |
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| VIDIOC_CREATE_BUFS | 17 | 17 | 17 | 12 | 17 |
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| VIDIOC_QUERYBUF | 15 | 15 | 15 | 10 | 15 |
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| VIDIOC_S_EXT_CTRLS | 13 | 14 | 11 | 5 | 10 |
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| VIDIOC_EXPBUF | 11 | 11 | 11 | 6 | 11 |
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| VIDIOC_QUERY_EXT_CTRL | 0 | 5 | 0 | 0 | 0 |
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| MEDIA_IOC_REQUEST_ALLOC | 4 | 4 | 4 | 4 | 4 |
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| MEDIA_REQUEST_IOC_QUEUE | varies | varies | varies | varies | varies |
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| MEDIA_REQUEST_IOC_REINIT | 0 (not pooled) | 0 | 0 | 0 | 3 |
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| DMA_BUF_IOCTL_SYNC | 0 | 0 | 0 | 4 | 0 |
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Notable structural observations:
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- **VIDIOC_EXPBUF** appears across all codecs (≥6 calls). ffmpeg-v4l2request exports CAPTURE buffers as DMA-BUF FDs to hand off to downstream consumers (or for cache-safe access). Our libva backend's iter8 trace did **not** show EXPBUF in the per-frame loop. This is an architectural divergence — ffmpeg uses DMA-BUF export by default for the readback-safe path; libva uses cached mmap via vaDeriveImage. Hypothesis (consistent with T4's findings): adding VIDIOC_EXPBUF + cache-aware DMA-BUF mapping to the libva backend's image-export path would fix the iter1 patch-0011 bug class on RK3399.
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- **DMA_BUF_IOCTL_SYNC × 4 only on MPEG-2.** That's `DMA_BUF_SYNC_START | _END` calls — explicit cache management. Why only on MPEG-2? Probably because the MPEG-2 fixture is the only one that exercises the consumer's CPU readback path during these 2 frames; the others output direct via DMA-BUF FD passthrough. Not gating; useful detail.
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- **VIDIOC_QUERY_EXT_CTRL × 5 only on HEVC.** ffmpeg's HEVC v4l2request decoder runtime-introspects the kernel's HEVC control struct (the `hevc_slice_params` dynamic-array, max 600 elements). H.264 control structs are version-stable so no QUERY_EXT_CTRL needed; HEVC isn't.
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- **MEDIA_IOC_REQUEST_ALLOC = 4** for every codec — ffmpeg uses a pool of 4 request_fds, recycled. Our libva backend allocates 16 (iter6 per-OUTPUT-slot binding). 4× difference in pool depth.
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- **MEDIA_REQUEST_IOC_REINIT** absent from H.264/HEVC/VP9/MPEG-2 ffmpeg traces, present 3× on VP8. ffmpeg's request-fd recycling pattern differs by codec (probably a function of how its decoder engages the request lifecycle). Our libva backend uses REINIT per-frame for all codecs (iter6 pattern). Both are valid.
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## Per-codec ftrace v4l2 events (kernel perspective)
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ftrace shows the kernel-side qbuf/dqbuf flow per codec:
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| Codec | ftrace lines | minor (device) | Notes |
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|---|---|---|---|
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| H.264 | 56 | minor=3 (rkvdec) | Frame-threaded ffmpeg workers (av:h264:dfN). Standard contract. |
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| HEVC | 60 | minor=3 (rkvdec) | Frame-threaded (av:hevc:dfN). Plus `dec0:0:hevc-NNNN` thread (ffmpeg's main decoder pump). Slightly more events than H.264 (HEVC needs slice_params per slice, hence more S_EXT_CTRLS). |
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| VP9 | 52 | minor=3 (rkvdec) | Standard frame-cycle pattern, slightly fewer events than H.264 (VP9 has frame-level controls only, no slice-mode). |
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| MPEG-2 | 32 | minor=5 (hantro-vpu-dec) | Single-threaded `dec0:0:mpeg2vid` (no frame-threading for MPEG-2 in ffmpeg). |
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| VP8 | 52 | minor=5 (hantro-vpu-dec) | Frame-threaded (av:vp8:dfN). |
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Sample HEVC per-frame pattern (from the ftrace head, decode loop):
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```
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av:hevc:df0 v4l2_qbuf minor=3 OUTPUT_MPLANE index=0 flags=...|0x800080
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av:hevc:df0 v4l2_qbuf minor=3 CAPTURE_MPLANE index=10 flags=MAPPED|QUEUED|...
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av:hevc:df1 v4l2_dqbuf minor=3 OUTPUT_MPLANE index=0 flags=...|0x800000
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av:hevc:df1 v4l2_dqbuf minor=3 CAPTURE_MPLANE index=10 flags=MAPPED|...
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```
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Same OUTPUT/CAPTURE buffer-pair contract as H.264. The structural pattern transfers across codecs unchanged — what varies is the S_EXT_CTRLS payload (codec-specific control class + struct).
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Sample MPEG-2 per-frame pattern:
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```
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dec0:0:mpeg2vid v4l2_qbuf minor=5 OUTPUT_MPLANE index=0 flags=...|0x800080 timestamp=6000
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dec0:0:mpeg2vid v4l2_qbuf minor=5 CAPTURE_MPLANE index=5 flags=MAPPED|QUEUED|...
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dec0:0:mpeg2vid v4l2_dqbuf minor=5 OUTPUT_MPLANE index=0 ...
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dec0:0:mpeg2vid v4l2_dqbuf minor=5 CAPTURE_MPLANE index=5 ...
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```
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Hantro-vpu-dec (`minor=5`) follows the same QBUF/DQBUF pattern as rkvdec, just on a different V4L2 device. Confirms the contract is uniform across both decode blocks on RK3399.
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## What this means for Phase 1 lock and beyond
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1. **Phase 1 lock can proceed.** Boolean-correctness criterion is well-defined and measurable for each codec. The per-codec status table above tells us which iterations have what shape.
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2. **Phase 6 work scope is purely libva-backend code.** Kernel + driver path is solid for all 5 codecs. No kernel patches needed; no upstream Linux engagement needed (good news per `feedback_no_upstream.md`).
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3. **Iteration ordering** suggested for fresnel-fourier (subject to Phase 1 lock):
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- **iter1**: MPEG-2 — likely the cheapest fix (config.c-level path investigation; mpeg2.c already compiled). Fastest path to "second codec works."
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- **iter2**: HEVC — re-enable h265.c in build, audit against rkvdec kernel contract, address whatever caused it to be stripped originally.
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- **iter3**: VP8 — implement vp8.c, model on FFmpeg's `v4l2_request_vp8.c` and kernel `hantro_vp8.c` (similar shape to MPEG-2 path on hantro).
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- **iter4**: VP9 — implement vp9.c, the most code (kernel `rkvdec_vp9.c` has the largest control struct surface).
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- **iter5+**: per-codec follow-ups (HEVC 10-bit if silicon does it, VP9 profile 2/3 if relevant, perf metrics per codec).
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4. **vaDeriveImage cache-stale bug** (T4 finding): orthogonal to per-codec work, applies to all codecs that succeed via libva. Phase 4 work item, can land independently of any single-codec iteration.
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## Re-run incantation
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```bash
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ssh fresnel '
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mkdir -p /tmp/cross_validator
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for codec in h264 hevc vp9 mpeg2 vp8; do
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case "$codec" in
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h264) FIXTURE=~/fourier-test/bbb_1080p30_h264.mp4;;
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hevc) FIXTURE=~/fourier-test/bbb_720p10s_hevc.mp4;;
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vp9) FIXTURE=~/fourier-test/bbb_720p10s_vp9.webm;;
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mpeg2) FIXTURE=~/fourier-test/bbb_720p10s_mpeg2.ts;;
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vp8) FIXTURE=~/fourier-test/bbb_720p10s_vp8.webm;;
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esac
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mkdir -p /tmp/cross_validator/$codec
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sudo sh -c "echo 0 > /sys/kernel/tracing/tracing_on; \
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echo 0 > /sys/kernel/tracing/trace; \
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echo 1 > /sys/kernel/tracing/events/v4l2/enable; \
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echo 1 > /sys/kernel/tracing/tracing_on"
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strace -ff -tt -y -e trace=ioctl -o /tmp/cross_validator/$codec/ffmpeg.strace \
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ffmpeg -hide_banner -loglevel error -hwaccel v4l2request \
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-i "$FIXTURE" -frames:v 2 -f null - > /tmp/cross_validator/$codec/ffmpeg.stdout 2>&1
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sudo cp /sys/kernel/tracing/trace /tmp/cross_validator/$codec/ftrace_v4l2.txt
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done
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sudo sh -c "echo 0 > /sys/kernel/tracing/tracing_on; echo 0 > /sys/kernel/tracing/events/v4l2/enable"
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'
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```
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## Evidence files
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Under `phase0_evidence/2026-05-07/cross_validator/<codec>/`:
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| File | Tracked? | Purpose |
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|---|---|---|
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| `ffmpeg.stdout` | yes | ffmpeg log (typically empty at -loglevel error; presence confirms a clean run) |
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| `ffmpeg.strace.*` | gitignored | per-thread strace ioctl dump |
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| `ftrace_v4l2.txt` | gitignored | kernel v4l2 tracepoint snapshot |
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The .stdout files are tracked; the .strace.* and ftrace_v4l2.txt files are gitignored as raw data, regenerable from the re-run incantation above. Frequency tables in this document are derived from the strace dumps via the same `grep -oE "ioctl\([0-9]+<[^>]+>, [A-Z_]+" | sort | uniq -c` pipeline used in T4.
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@@ -0,0 +1,108 @@
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# Per-codec test fixtures — fresnel 2026-05-07
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Phase 0 deliverable #5. Fixtures for the five locked codecs (H.264 + HEVC + VP9 + MPEG-2 + VP8), all derived from the same Big Buck Bunny H.264 master, generated on fresnel with stock ffmpeg `n8.1-13`.
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## Inventory
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All fixtures live at `~/fourier-test/` on fresnel. Same path on ohm (carryover convention from libva-multiplanar). H.264 master mirrored on both hosts.
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| Codec | File | Size | Profile/Level | Resolution | Pix fmt | Duration | Targets V4L2 device |
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|---|---|---|---|---|---|---|---|
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| H.264 | `bbb_1080p30_h264.mp4` (carryover) | 725 MB | High@4.0 | 1920×1080 | yuv420p | 596 s | rkvdec `/dev/video3` (`S264`) |
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| HEVC | `bbb_720p10s_hevc.mp4` | 620 KB | Main 8-bit | 1280×720 | yuv420p | 10 s | rkvdec `/dev/video3` (`S265`) |
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| VP9 | `bbb_720p10s_vp9.webm` | 3.4 MB | Profile 0 (8-bit 4:2:0) | 1280×720 | yuv420p | 10 s | rkvdec `/dev/video3` (`VP9F`) |
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| MPEG-2 | `bbb_720p10s_mpeg2.ts` | 5.3 MB | Main | 1280×720 | yuv420p | 10 s | hantro-vpu-dec `/dev/video5` (`MG2S`) |
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| VP8 | `bbb_720p10s_vp8.webm` | 2.4 MB | Profile 0 | 1280×720 | yuv420p | 10 s | hantro-vpu-dec `/dev/video5` (`VP8F`) |
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Codec scope alignment (per `phase0_findings.md` LOCK + 2026-05-07 evening corrections):
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- **rkvdec**: 8-bit Main HEVC (silicon doesn't do 10-bit reliably; rkvdec advertises Main 10 in its menu but RK3399 hardware support is unverified — 8-bit fixture stays in the "expected to work" lane).
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- **rkvdec**: VP9 Profile 0 only (kernel menu shows `vp9_profile min=0 max=0 default=0` — no other profile is enumerable).
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- **hantro-vpu-dec**: MPEG-2 Main (per kernel `hantro_mpeg2.c`).
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- **hantro-vpu-dec**: VP8 (single profile, no menu).
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## Generation provenance
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All four non-H.264 fixtures generated on fresnel 2026-05-07 23:34–23:36 CEST from the H.264 master via stock ffmpeg software encoders:
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```bash
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INPUT=~/fourier-test/bbb_1080p30_h264.mp4
|
||||
|
||||
# HEVC Main 8-bit, 720p, 10s seek-30s, x265 ultrafast
|
||||
ffmpeg -y -ss 30 -t 10 -i "$INPUT" \
|
||||
-vf scale=1280:720 -c:v libx265 -preset ultrafast -crf 28 \
|
||||
-profile:v main -pix_fmt yuv420p -tag:v hvc1 -an \
|
||||
~/fourier-test/bbb_720p10s_hevc.mp4
|
||||
|
||||
# VP9 Profile 0, 720p, 10s, libvpx-vp9 speed 5 with row-mt
|
||||
ffmpeg -y -ss 30 -t 10 -i "$INPUT" \
|
||||
-vf scale=1280:720 -c:v libvpx-vp9 -speed 5 -row-mt 1 \
|
||||
-profile:v 0 -pix_fmt yuv420p -an -b:v 2M \
|
||||
~/fourier-test/bbb_720p10s_vp9.webm
|
||||
|
||||
# MPEG-2 Main, 720p, 10s, transport stream container
|
||||
ffmpeg -y -ss 30 -t 10 -i "$INPUT" \
|
||||
-vf scale=1280:720 -c:v mpeg2video -profile:v 4 -level:v 8 \
|
||||
-b:v 4M -pix_fmt yuv420p -an \
|
||||
~/fourier-test/bbb_720p10s_mpeg2.ts
|
||||
|
||||
# VP8, 720p, 10s, libvpx
|
||||
ffmpeg -y -ss 30 -t 10 -i "$INPUT" \
|
||||
-vf scale=1280:720 -c:v libvpx -deadline good -cpu-used 4 \
|
||||
-pix_fmt yuv420p -an -b:v 2M \
|
||||
~/fourier-test/bbb_720p10s_vp8.webm
|
||||
```
|
||||
|
||||
Wall-clock encode times on fresnel RK3399:
|
||||
|
||||
| Codec | Wall | User CPU | Notes |
|
||||
|---|---|---|---|
|
||||
| HEVC | 13.4 s | 66.6 s | x265 ultrafast across 5 of 6 cores |
|
||||
| VP9 | 93.4 s | 278.3 s | libvpx-vp9 -speed 5 -row-mt 1, 3-core utilization |
|
||||
| MPEG-2 | 5.95 s | 24.5 s | mpeg2video, lightweight |
|
||||
| VP8 | 26.4 s | 108.4 s | libvpx -cpu-used 4, 4-core utilization |
|
||||
|
||||
Reproducible: re-run the four `ffmpeg` invocations above; outputs should hash-match modulo encoder-version non-determinism (libx265/libvpx don't always produce bit-exact identical encodes across runs even with identical flags).
|
||||
|
||||
## Why 720p / 10s
|
||||
|
||||
- **720p** matches the second-most-common consumer playback resolution (mpv, Firefox YouTube embed, Chromium WebRTC) without exhausting the 1080p H.264 master's encoded resolution (downscale, never upscale). Keeps encode time ≪ 2 minutes per codec on RK3399 SW encoders.
|
||||
- **10s** = 240 frames at 24 fps. Long enough to see DPB activity, B-frame ordering (where applicable), reference-frame pumping, and any transient bug like iter4's frame-11 EINVAL on libva-multiplanar. Short enough for a contract trace's grep'ability.
|
||||
- **8-bit yuv420p** matches the kernel's silicon support reality for all five codecs on RK3399.
|
||||
|
||||
## Encoder choice rationale
|
||||
|
||||
- **libx265 ultrafast preset** for HEVC: trades file size for encode wall-time. We don't care about quality (decode-side test, not encode-side); we care about a valid, parseable HEVC bitstream that exercises the rkvdec HEVC path.
|
||||
- **libvpx-vp9 speed 5** for VP9: balanced — speed 6+ hurts conformance, speed 4 doubles the encode time.
|
||||
- **mpeg2video profile 4 level 8 (Main, ML)**: the most generic compatibility target. RK3399 hantro accepts Simple and Main; Main covers both and is what's commonly streamed.
|
||||
- **libvpx (vp8)**: stock libvpx, no speed tuning needed — VP8 is fast enough.
|
||||
|
||||
Phase 1+ may add additional fixtures: longer durations (60s+ for run-stability), higher resolutions (1080p HEVC for rkvdec stress), or additional source content (e.g., a low-motion test pattern, a high-motion sports clip). Keeping Phase 0 at the smallest set that exercises each codec's request-API contract on its assigned V4L2 node.
|
||||
|
||||
## Verification
|
||||
|
||||
Each fixture probed via `ffprobe -v error -show_entries stream=codec_name,profile,pix_fmt,width,height,r_frame_rate,duration`:
|
||||
|
||||
| File | codec_name | profile | pix_fmt | width×height | fps | duration |
|
||||
|---|---|---|---|---|---|---|
|
||||
| `bbb_720p10s_hevc.mp4` | hevc | Main | yuv420p | 1280×720 | 24/1 | 10.000000 |
|
||||
| `bbb_720p10s_vp9.webm` | vp9 | Profile 0 | yuv420p | 1280×720 | 24/1 | N/A (live-stream container) |
|
||||
| `bbb_720p10s_mpeg2.ts` | mpeg2video | Main | yuv420p | 1280×720 | 24/1 | 10.000000 |
|
||||
| `bbb_720p10s_vp8.webm` | vp8 | 0 | yuv420p | 1280×720 | 24/1 | N/A (live-stream container) |
|
||||
|
||||
Profile/pix_fmt match the campaign codec scope. Phase 1 binding cells per codec can use these directly.
|
||||
|
||||
## Open future-fixture items (not Phase 0 gating)
|
||||
|
||||
- **Test patterns** for synthetic decode-correctness checks (constant-color frames, gradient ramps, single-pixel motion). Useful for bit-exact verification beyond JPEG-of-real-content. Not generated yet; Phase 1 work item.
|
||||
- **Long-duration variants** (60s, 5min) for run-stability / leak detection. iter7's slot-leak fix is in iter8 master so this should be clean, but a long-run trace would prove it on RK3399.
|
||||
- **Stress fixtures**: 1080p HEVC, 1080p VP9, complex motion. Defer until basic boolean-correctness lands per codec.
|
||||
- **chromium-fourier 149 reference clips** if the cross-validator engages a different fixture format (e.g., MSE/EME-encrypted clip for DRM-path validation). Not in Phase 0 scope.
|
||||
|
||||
## Storage / mirroring
|
||||
|
||||
- `~/fourier-test/` on fresnel is the working location.
|
||||
- Mirror to `data:/moviedata/fourier-test/` for fleet-wide availability — pending; data is currently offline (no route to host as of 2026-05-07 22:34). Wake via the his cheatsheet (Fritz!DECT plug or WoL) when the next iteration needs cross-host fixtures.
|
||||
- `~/fourier-test/` on ohm holds the H.264 master; ohm doesn't yet have the new per-codec clips. Decision deferred — fresnel-fourier is the campaign that needs them; ohm is the libva-multiplanar testbed (already H.264-only-locked at iter5+).
|
||||
|
||||
The fixtures are gitignored as binary content (`*.mp4`, `*.webm`, `*.ts` are treated as raw data; not in `phase*_evidence/` extension allow-list). They live on fresnel; this document is the canonical inventory.
|
||||
Reference in New Issue
Block a user