chatgui: restore FFmpeg build script (build_ffmpeg.sh + .gitignore)

Скрипт был случайно удалён в d773f172 вместе с .gitignore/.opencode.
Без него на Windows не собирается ffmpeg/ffmpeg_build/install -> HAVE_FFMPEG
не определяется -> воспроизведение и транскодирование видео отключены.

tools/chatgui/ffmpeg/.gitignore

@@ -0,0 +1 @@
+/ffmpeg_build/

tools/chatgui/ffmpeg/build_ffmpeg.sh

@@ -0,0 +1,269 @@
+#!/bin/bash
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+BUILD_DIR="$SCRIPT_DIR/ffmpeg_build"
+SRC_DIR="$BUILD_DIR/src"
+INSTALL_DIR="$BUILD_DIR/install"
+JOBS=$(nproc 2>/dev/null || echo 4)
+
+case "$(uname -s)" in
+    Linux)                      PLATFORM=linux ;;
+    MINGW*|MSYS*|CYGWIN*)       PLATFORM=windows ;;
+    *) echo "Unsupported platform: $(uname -s)"; exit 1 ;;
+esac
+
+log()  { echo "[FFmpeg] $1"; }
+die()  { echo "[FFmpeg] ERROR: $1" >&2; exit 1; }
+check_cmd() { command -v "$1" >/dev/null 2>&1 || die "$1 not found. Install it first."; }
+
+do_clone() {
+    local name="$1" url="$2" tag="$3"
+    if [ ! -d "$SRC_DIR/$name" ]; then
+        log "Clone $name..."
+        for i in 1 2 3; do
+            git clone --depth 1 --branch "$tag" "$url" "$SRC_DIR/$name" 2>&1 && break
+            log "Clone attempt $i failed, retrying..."
+            rm -rf "$SRC_DIR/$name"
+            sleep 2
+        done
+        [ -d "$SRC_DIR/$name/.git" ] || die "Failed to clone $name after 3 attempts"
+    else
+        log "Skip clone $name: already exists"
+    fi
+}
+
+# ============================================================================
+# Step 0: System dependencies
+# ============================================================================
+if [ "$PLATFORM" = "linux" ]; then
+    MISSING=""
+    for pkg in build-essential cmake nasm pkg-config meson ninja-build git; do
+        dpkg -s "$pkg" >/dev/null 2>&1 || MISSING="$MISSING $pkg"
+    done
+    if [ -n "$MISSING" ]; then
+        log "Installing build tools:$MISSING"
+        sudo apt update -qq && sudo apt install -y $MISSING
+    fi
+    HW_DEPS="libva-dev libvdpau-dev"
+    for pkg in $HW_DEPS; do
+        dpkg -s "$pkg" >/dev/null 2>&1 || { log "Installing $pkg (HW accel)"; sudo apt install -y $pkg; }
+    done
+else
+    check_cmd pacman
+    for pkg in mingw-w64-ucrt-x86_64-cmake mingw-w64-ucrt-x86_64-ninja mingw-w64-ucrt-x86_64-nasm \
+               mingw-w64-ucrt-x86_64-pkg-config mingw-w64-ucrt-x86_64-meson; do
+        pacman -Qi "$pkg" >/dev/null 2>&1 || { log "Installing $pkg"; pacman -S --noconfirm "$pkg"; }
+    done
+fi
+
+check_cmd cmake
+check_cmd nasm
+check_cmd pkg-config
+check_cmd meson
+check_cmd git
+
+# ============================================================================
+# Step 1: Codec libraries (static .a, built with -fPIC)
+# ============================================================================
+mkdir -p "$SRC_DIR" "$INSTALL_DIR/lib/pkgconfig"
+
+export PKG_CONFIG_PATH="$INSTALL_DIR/lib/pkgconfig${PKG_CONFIG_PATH:+:$PKG_CONFIG_PATH}"
+
+# --- x264 (H.264 encoder) ---
+if [ ! -f "$INSTALL_DIR/lib/pkgconfig/x264.pc" ]; then
+    do_clone x264 https://code.videolan.org/videolan/x264.git stable
+    cd "$SRC_DIR/x264"
+    log "Configure x264..."
+    ./configure --prefix="$INSTALL_DIR" --enable-static --disable-shared \
+        --disable-opencl --disable-avs --disable-swscale --disable-lavf \
+        --disable-ffms --disable-gpac --disable-lsmash \
+        --extra-cflags="-fPIC" --disable-cli
+    log "Build x264..."
+    make -j"$JOBS"
+    make install
+    log "x264 OK"
+else
+    log "Skip x264: already built"
+fi
+
+# --- x265 (H.265/HEVC encoder) ---
+if [ ! -f "$INSTALL_DIR/lib/pkgconfig/x265.pc" ]; then
+    do_clone x265 https://bitbucket.org/multicoreware/x265_git.git master
+    cd "$SRC_DIR/x265"
+    mkdir -p build && cd build
+    log "Configure x265..."
+    cmake ../source -G "Unix Makefiles" \
+        -DCMAKE_INSTALL_PREFIX="$INSTALL_DIR" \
+        -DBUILD_SHARED_LIBS=OFF \
+        -DCMAKE_POSITION_INDEPENDENT_CODE=ON \
+        -DENABLE_CLI=OFF -DENABLE_SHARED=OFF \
+        -DHIGH_BIT_DEPTH=OFF -DENABLE_HDR10_PLUS=OFF
+    log "Build x265..."
+    cmake --build . -j"$JOBS"
+    cmake --install .
+    cat > "$INSTALL_DIR/lib/pkgconfig/x265.pc" <<EOF
+prefix=$INSTALL_DIR
+exec_prefix=\${prefix}
+libdir=\${exec_prefix}/lib
+includedir=\${prefix}/include
+
+Name: x265
+Description: H.265/HEVC video encoder
+Version: 4.1
+Libs: -L\${libdir} -lx265
+Libs.private: -lstdc++ -lm -lpthread
+Cflags: -I\${includedir}
+EOF
+    log "x265 OK"
+else
+    log "Skip x265: already built"
+fi
+
+# --- libvpx (VP8/VP9 encoder) ---
+if [ ! -f "$INSTALL_DIR/lib/pkgconfig/vpx.pc" ]; then
+    do_clone libvpx https://chromium.googlesource.com/webm/libvpx main
+    cd "$SRC_DIR/libvpx"
+    log "Configure libvpx..."
+    ./configure --prefix="$INSTALL_DIR" --enable-static --disable-shared \
+        --enable-pic --enable-vp8 --enable-vp9 --enable-vp9-highbitdepth \
+        --disable-examples --disable-tools --disable-docs --disable-unit-tests
+    log "Build libvpx..."
+    make -j"$JOBS"
+    make install
+    log "libvpx OK"
+else
+    log "Skip libvpx: already built"
+fi
+
+# --- SVT-AV1 (fast AV1 encoder) ---
+if [ ! -f "$INSTALL_DIR/lib/pkgconfig/SvtAv1Enc.pc" ]; then
+    do_clone SVT-AV1 https://gitlab.com/AOMediaCodec/SVT-AV1.git v2.3.0
+    cd "$SRC_DIR/SVT-AV1"
+    mkdir -p build && cd build
+    log "Configure SVT-AV1..."
+    cmake .. -G "Unix Makefiles" \
+        -DCMAKE_INSTALL_PREFIX="$INSTALL_DIR" \
+        -DBUILD_SHARED_LIBS=OFF -DBUILD_APPS=OFF \
+        -DBUILD_TESTING=OFF -DBUILD_DEC=OFF
+    log "Build SVT-AV1..."
+    cmake --build . -j"$JOBS"
+    cmake --install .
+    log "SVT-AV1 OK"
+else
+    log "Skip SVT-AV1: already built"
+fi
+
+# --- libaom (reference AV1 encoder) ---
+if [ ! -f "$INSTALL_DIR/lib/pkgconfig/aom.pc" ]; then
+    do_clone libaom https://aomedia.googlesource.com/aom v3.12.0
+    cd "$SRC_DIR/libaom"
+    mkdir -p build && cd build
+    log "Configure libaom..."
+    cmake .. -G "Unix Makefiles" \
+        -DCMAKE_INSTALL_PREFIX="$INSTALL_DIR" \
+        -DBUILD_SHARED_LIBS=OFF -DENABLE_TESTS=OFF \
+        -DENABLE_TOOLS=OFF -DENABLE_DOCS=OFF \
+        -DENABLE_NASM=ON
+    log "Build libaom..."
+    cmake --build . -j"$JOBS"
+    cmake --install .
+    log "libaom OK"
+else
+    log "Skip libaom: already built"
+fi
+
+# --- dav1d (fast AV1 decoder) ---
+if [ ! -f "$INSTALL_DIR/lib/pkgconfig/dav1d.pc" ]; then
+    do_clone dav1d https://code.videolan.org/videolan/dav1d.git 1.5.1
+    cd "$SRC_DIR/dav1d"
+    log "Configure dav1d..."
+    meson setup build --prefix="$INSTALL_DIR" --buildtype release --libdir lib \
+        -Ddefault_library=static -Denable_tools=false -Denable_tests=false -Denable_docs=false
+    log "Build dav1d..."
+    meson compile -C build -j"$JOBS"
+    meson install -C build
+    log "dav1d OK"
+else
+    log "Skip dav1d: already built"
+fi
+
+# --- nv-codec-headers (NVIDIA NVENC/NVDEC headers, no build needed) ---
+if [ ! -f "$INSTALL_DIR/include/ffnvcodec/nvEncodeAPI.h" ]; then
+    do_clone nv-codec-headers https://github.com/FFmpeg/nv-codec-headers.git master
+    cd "$SRC_DIR/nv-codec-headers"
+    log "Install nv-codec-headers..."
+    make install PREFIX="$INSTALL_DIR"
+    log "nv-codec-headers OK"
+else
+    log "Skip nv-codec-headers: already installed"
+fi
+
+# ============================================================================
+# Step 2: FFmpeg
+# ============================================================================
+if [ -f "$INSTALL_DIR/lib/pkgconfig/libavcodec.pc" ]; then
+    log "FFmpeg already built, skipping."
+    log "Done: $INSTALL_DIR"
+    exit 0
+fi
+
+FFMPEG_SRC="$SRC_DIR/ffmpeg"
+if [ ! -d "$FFMPEG_SRC" ]; then
+    log "Download FFmpeg 7.1.2..."
+    FFMPEG_TARBALL="$SRC_DIR/ffmpeg-7.1.2.tar.xz"
+    if [ ! -f "$FFMPEG_TARBALL" ]; then
+        for url in \
+            "https://ffmpeg.org/releases/ffmpeg-7.1.2.tar.xz" \
+            "https://github.com/FFmpeg/FFmpeg/archive/refs/tags/n7.1.2.tar.gz"; do
+            curl -L --retry 3 -o "$FFMPEG_TARBALL" "$url" 2>&1 && break
+            log "Download from $url failed, trying next..."
+            rm -f "$FFMPEG_TARBALL"
+        done
+        [ -f "$FFMPEG_TARBALL" ] || die "Failed to download FFmpeg tarball"
+        log "Download OK ($(du -h "$FFMPEG_TARBALL" | cut -f1))"
+    fi
+    log "Extract FFmpeg..."
+    mkdir -p "$FFMPEG_SRC"
+    tar -xf "$FFMPEG_TARBALL" -C "$FFMPEG_SRC" --strip-components=1
+    rm -f "$FFMPEG_TARBALL"
+fi
+
+cd "$SRC_DIR/ffmpeg"
+log "Configure FFmpeg..."
+
+CONFIGURE_ARGS=(
+    --prefix="$INSTALL_DIR"
+    --enable-shared --disable-static
+    --enable-gpl --enable-version3
+    --pkg-config-flags=--static
+    --extra-cflags="-I$INSTALL_DIR/include"
+    --extra-ldflags="-L$INSTALL_DIR/lib"
+    --extra-libs="-lpthread -lm -ldl"
+    --enable-libx264 --enable-libx265
+    --enable-libvpx --enable-libsvtav1 --enable-libaom
+    --enable-libdav1d
+    --enable-nvenc --enable-cuda --enable-cuvid
+    --enable-vaapi --enable-vdpau
+    --disable-programs --disable-doc --disable-avdevice
+    --disable-ffprobe --disable-ffplay --disable-ffmpeg
+    --disable-debug --enable-optimizations
+)
+
+if [ "$PLATFORM" = "windows" ]; then
+    CONFIGURE_ARGS+=(
+        --enable-d3d11va --enable-dxva2
+    )
+fi
+
+"./configure" "${CONFIGURE_ARGS[@]}"
+
+log "Build FFmpeg..."
+make -j"$JOBS"
+make install
+
+log "==============================================================="
+log "FFmpeg build SUCCESS"
+log "Install prefix: $INSTALL_DIR"
+log "Libraries: $(ls "$INSTALL_DIR/lib/"*.so* "$INSTALL_DIR/lib/"*.dll.a "$INSTALL_DIR/bin/"*.dll 2>/dev/null | tr '\n' ' ')"
+log "==============================================================="