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fix(ffmpeg): re-pin dead BtbN tag (first real recording 404'd), wrap download failures in actionable IOException

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The 2026-08-09 pin was a DAILY build; BtbN retention aged it out and the cold-cache
download 404'd on the creator's first native recording attempt (2026-09-01,
startup.log). Re-pinned to the MONTH-END build autobuild-2026-08-31-13-27
(N-126342, lgpl-shared win64 — 2-year retention; tag+variant recorded in TASKS.md
per the licensing rule). Verified alive: HEAD 200 + zip contents (bin/ffmpeg.exe,
bin/ffprobe.exe, 7 libav DLLs) match the name-agnostic extractor.
Also closes the wrap-gap: HttpRequestException escaped the locator untouched,
surfacing a raw 'Response status code... 404' from the frame pump; now wrapped in
IOException with the refresh-pin-or-install-ffmpeg message. FfmpegLocatorTests 7/7
(one updated, one added for the 404 case).
This commit is contained in:
Llama Chile Shop
2026-09-01 20:52:23 -07:00
parent 7294a1aa2d
commit 22b780e075
3 changed files with 47 additions and 6 deletions
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TASKS.md
+8 -3
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@@ -342,10 +342,15 @@ provides one.
compliance is "license text + source offer + unmodified binaries" (see `THIRD-PARTY-NOTICES.txt` and
`ai.md` → Licensing). Drops libx264/libx265 while keeping NVENC/QSV/AMF, libopenh264 (the LGPL-legal
H.264 software fallback) and native AAC — exactly the requirement-1 encoder profile.
2. **Pinned URL** — `https://github.com/BtbN/FFmpeg-Builds/releases/download/autobuild-2026-08-09-13-03/ffmpeg-master-latest-win64-lgpl-shared.zip`
(~75 MB zip — earlier "~30 MB" estimate corrected). A dated autobuild tag is immutable; BtbN retention
2. **Pinned URL** — **RE-PINNED 2026-09-01**: `https://github.com/BtbN/FFmpeg-Builds/releases/download/autobuild-2026-08-31-13-27/ffmpeg-N-126342-gf88b741dbf-win64-lgpl-shared.zip`
(BtbN **lgpl-shared** variant, ffmpeg N-126342; ~75 MB zip — earlier "~30 MB" estimate corrected). A dated autobuild tag is immutable; BtbN retention
keeps the last 14 daily builds + each month-end build for 2 years, so a cold cache after retention
expiry 404s — a logged, recoverable failure (the seam throws; the encoder step surfaces it). Once
expiry 404s — a logged, recoverable failure (the seam throws; the encoder step surfaces it). The
first pin (`autobuild-2026-08-09-13-03`, a daily) aged out on 2026-09-01 — the first real recording
attempt — proving the rule; the new pin is deliberately the **month-end** build (2-year retention).
Dated tags carry versioned asset names (`ffmpeg-N-…-win64-lgpl-shared.zip`), extraction is
name-agnostic; download failures now wrap in `IOException` with an actionable message
("refresh `FfmpegLocator.PinnedUrl` or install ffmpeg on PATH") instead of leaking a raw 404. Once
cached, the URL is never touched again. The pin is a single `const`, bumpable in one place — and must
always stay on the **shared** variant (never `gpl`, `nonfree`, or static; see ai.md Licensing).
3. **Check-then-pull order** — (1) PATH probe (the user's own install wins), (2) cached