pspautotests: avchold covers a stream spliced on without a flush

Updates the submodule for video/mp4/avchold's ref3b1hrdsplice, recorded
on a PSP, which fails without the AvcDecoder fix on this branch: the pictures after
the splice never come out.

avchold and decodeend only test anything with Sony's mpeg and mp4
modules running, which headless never does for homebrew unless asked,
and which CI doesn't have. docs/pspautotests.md now says how to run
them (--disable-hle=0x110 and a memory stick with a firmware dump).

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

AGENTS.md

@@ -17,7 +17,7 @@ for it:
 | [docs/DebuggerThreading.md](docs/DebuggerThreading.md) | `Core_RunOnCPUThread` / `g_frameMutex` / shutdown-lock rules - required reading before touching debugger code |
 | [docs/HLEModules.md](docs/HLEModules.md) | Adding an HLE module or function, and the seven build files a new source file goes in |
 | [docs/translations.md](docs/translations.md) | Translating UI strings with Tools/langtool |
-| [docs/pspautotests.md](docs/pspautotests.md) | Workflow for improving PPSSPP using pspautotests |
+| [docs/pspautotests.md](docs/pspautotests.md) | Workflow for improving PPSSPP using pspautotests, and running the tests that need the real firmware modules (`--disable-hle`, a firmware memstick) |
 | [docs/pspautotests-hardware.md](docs/pspautotests-hardware.md) | Writing a new pspautotest, and running it on a real PSP over PSPLink to record its `.expected` |
 | [docs/frametest.md](docs/frametest.md) | Framedump rendering tests, and replaying a dump on a real PSP |
 | [docs/sceGe.md](docs/sceGe.md) | How the firmware queues display lists, what SIGNAL and FINISH interrupts do and in which order, and how `ProcessDLQueue()` keeps that order |

docs/pspautotests.md

@@ -57,6 +57,32 @@ Instead of a single PRX, you can pass a directory (e.g. `pspautotests/tests/thre
   same idea in emulated time, and both can be set at once. `--timeout` is the old name for `--timeout-wall`.
 - `--graphics=software` — uses software GPU backend (required for headless; no real GPU available).
 
+### Tests that need the real firmware modules
+
+A pspautotest is homebrew, so headless runs every library on our HLE for it
+(`iForceEnableHLE` in `headless/Headless.cpp`), even the ones the app runs from the firmware by
+default. Some tests only mean anything against the real module: `video/mp4/avchold` and
+`video/mpeg/decodeend` test the Media Engine through Sony's `libmp4.prx`, `mp4msv.prx` and
+`mpeg.prx`, which call our `sceVideocodec` HLE. Run on our HLE, `avchold` reports
+`0 samples, 0 decodes` for every stream (our sceMp4 is stubs: the log says `UNIMPL sceMp4Create`),
+and it fails without exercising the decoder at all.
+
+To run them as the hardware does, pass both:
+
+- `--disable-hle=N`, the `DisableHLEFlags` bits (`Core/ConfigValues.h`) of the libraries to run
+  for real, in decimal or `0x` hex. sceMpeg is 0x10 and sceMp4 is 0x100, so the video tests take
+  `--disable-hle=0x110`.
+- `--memstick=` pointing at a memory stick with a firmware dump in `PSP/NAND/flash0/kd`. `test.py`
+  otherwise hands headless the empty one beside the exe. Since the flag is explicit, headless exits
+  with an error naming the missing module rather than falling back to HLE.
+
+```
+python test.py video/mp4/avchold video/mpeg/decodeend --graphics=software --memstick=<app memstick> --disable-hle=0x110
+```
+
+CI has no firmware dump, so these tests stay in `tests_next`, and a change to the video path
+needs this run done by hand.
+
 ### What you'll see
 
 **Passing test:**

test.py

@@ -675,9 +675,9 @@ tests_next = [
   #"utility/savedata/saveemptyfilename",
   "utility/savedata/secureversion",
   "utility/savedata/sizes",
-  "video/mp4/avchold",
+  "video/mp4/avchold",  # needs Sony's mp4 and mpeg modules: --disable-hle=0x110, see docs/pspautotests.md
   "video/mpeg/basic",
-  "video/mpeg/decodeend",
+  "video/mpeg/decodeend",  # needs Sony's mpeg module, as avchold
   "video/mpeg/deletetiming",
   "video/pmf/pmf",
   "video/pmf_simple/pmf_simple",