FFmpeg 7.1 + cuframes input demuxer

Snapshot FFmpeg n7.1 (release tag) с применённым patch'ем для cuframes
input format. Используется как FFMPEG_REPO_OVERRIDE в NickM-27/FFmpeg-Builds
fork для статической сборки patched binary под Frigate (Debian 12 / glibc 2.36).

Apply changes:
  + libavformat/cuframesdec.c (новый — реализация демуксера)
  M libavformat/Makefile (CONFIG_CUFRAMES_DEMUXER target)
  M libavformat/allformats.c (extern declaration)
  M configure (--enable-libcuframes option + dep check)

Patch source: https://git.goldix.org/gx/cuframes (filter/ffmpeg-7.1-cuframes-demuxer.patch)

History сброшена (snapshot вместо fork) потому что upstream shallow clone
не позволял push в gitea. Полная история FFmpeg — на github.com/FFmpeg/FFmpeg n7.1.

tools/libav-merge-next-commit

@@ -0,0 +1,22 @@
+#!/bin/sh
+
+if [ "$1" != "merge" -a "$1" != "noop" ]; then
+    printf "Usage: $0 <merge|noop [REF_HASH]>\n"
+    exit 0
+fi
+
+[ "$1" = "noop" ] && merge_opts="-s ours"
+
+nextrev=$(git rev-list libav/master --not master --no-merges | tail -n1)
+if [ -z "$nextrev" ]; then
+    printf "Nothing to merge..\n"
+    exit 0
+fi
+printf "Merging $(git log -n 1 --oneline $nextrev)\n"
+git merge --no-commit $merge_opts --no-ff --log $nextrev
+
+if [ "$1" = "noop" -a -n "$2" ]; then
+    printf "\nThis commit is a noop, see $2\n" >> .git/MERGE_MSG
+fi
+
+printf "\nMerged-by: $(git config --get user.name) <$(git config --get user.email)>\n" >> .git/MERGE_MSG