fix(ci): pin FFmpeg n7.1 to the 2026-07-31 month-end BtbN release

tools/fetch-ffmpeg-linux.sh

@@ -19,19 +19,21 @@
 #          rather than the rolling `latest` tag. `latest` is rebuilt daily and
 #          only keeps the branches BtbN currently builds: n7.1 was dropped from
 #          it in August 2026 (only master / n8.1 / n9.0 remain), which 404'd this
-#          script and took CI down with it. A dated tag keeps its assets, and the
-#          SHA-256 below makes a silently swapped or truncated archive fail here
-#          instead of at runtime.
+#          script and took CI down with it. Only month-end dated tags are kept
+#          long-term (back to 2024); mid-month ones are pruned within weeks, which
+#          404'd the previous 2026-08-16 pin. 2026-07-31 is the last month-end tag
+#          that still carries n7.1. The SHA-256 below makes a silently swapped or
+#          truncated archive fail here instead of at runtime.
 # Flavor:  lgpl-shared (no GPL components; redistributable alongside the app as
 #          long as the .so remain shared + replaceable — see README "Licensing").
 set -euo pipefail
 
 # Overridable together: a different release/asset needs its own checksum, and
 # an empty EXPECTED_SHA256 skips the check (with a warning) rather than failing
 # every override.
-FFMPEG_RELEASE="${FFMPEG_RELEASE:-autobuild-2026-08-16-13-00}"
-ASSET_NAME="${ASSET_NAME:-ffmpeg-n7.1.5-16-g9a4bb2c579-linux64-lgpl-shared-7.1.tar.xz}"
-EXPECTED_SHA256="${EXPECTED_SHA256-05e4cf57a4f8bb63bda8a1a306dbf370c03e305088e7153c02e7761b2c181ec0}"
+FFMPEG_RELEASE="${FFMPEG_RELEASE:-autobuild-2026-07-31-14-10}"
+ASSET_NAME="${ASSET_NAME:-ffmpeg-n7.1.5-12-g1fdbca85aa-linux64-lgpl-shared-7.1.tar.xz}"
+EXPECTED_SHA256="${EXPECTED_SHA256-f5f0ad52c6ee28a222eb10838c231469a10ad325f84063d3bc0aadf08164b3ec}"
 FORCE="${FORCE:-0}"
 
 repo_root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"

tools/fetch-ffmpeg.ps1

@@ -9,18 +9,21 @@
   Version pin: n7.1 (matches FFmpeg.AutoGen 7.1.x bindings), taken from a dated
   release rather than the rolling `latest` tag - `latest` only keeps the branches
   BtbN currently builds, and n7.1 was dropped from it in August 2026 (master /
-  n8.1 / n9.0 remain), which 404'd this script. The SHA-256 below turns a swapped
-  or truncated archive into a failure here instead of at runtime.
+  n8.1 / n9.0 remain), which 404'd this script. Only month-end dated tags are
+  kept long-term; mid-month ones get pruned (that 404'd the 2026-08-16 pin), so
+  this uses 2026-07-31, the last month-end tag that still carries n7.1. The
+  SHA-256 below turns a swapped or truncated archive into a failure here
+  instead of at runtime.
   Build flavor: lgpl-shared (no GPL components; safe to redistribute alongside
   a closed-source app provided DLLs remain replaceable).
 #>
 [CmdletBinding()]
 param(
-    [string]$FfmpegRelease  = "autobuild-2026-08-16-13-00",
-    [string]$AssetName      = "ffmpeg-n7.1.5-16-g9a4bb2c579-win64-lgpl-shared-7.1.zip",
+    [string]$FfmpegRelease  = "autobuild-2026-07-31-14-10",
+    [string]$AssetName      = "ffmpeg-n7.1.5-12-g1fdbca85aa-win64-lgpl-shared-7.1.zip",
     # A different release/asset needs its own hash; pass an empty string to skip
     # the check rather than have every override fail.
-    [string]$ExpectedSha256 = "a950596cea0bf9766f169dae6f1e6eb623aa1ccfd2822cd20cd2874b120d4086",
+    [string]$ExpectedSha256 = "0f376f96fb38554ccefb1b2ae9c7c6a7b351f0e60a372b38262c320e8392c5d0",
     [switch]$Force
 )