GitHub CI [Linux, FFmpeg]: build rav1e

+ do not use yasm for SVT - nasm-mozilla (nasm 2.14) installed in
this commit is sufficient

.github/scripts/Linux/download_build_ffmpeg.sh

@@ -11,7 +11,6 @@ install_libvpx() {
 }
 
 install_svt() {
-        sudo apt install yasm
         ( git clone --depth 1 https://github.com/OpenVisualCloud/SVT-HEVC && cd SVT-HEVC/Build/linux && ./build.sh release && cd Release && make -j $(nproc) && sudo make install || exit 1 )
         ( git clone --depth 1 https://github.com/OpenVisualCloud/SVT-AV1 && cd SVT-AV1 && cd Build && cmake .. -G"Unix Makefiles" -DCMAKE_BUILD_TYPE=Release && make -j $(nproc) && sudo make install || exit 1 )
         ( git clone --depth 1 https://github.com/OpenVisualCloud/SVT-VP9.git && cd SVT-VP9/Build && cmake .. -DCMAKE_BUILD_TYPE=Release && make -j $(nproc) && sudo make install || exit 1 )
@@ -38,6 +37,7 @@ for n in $GITHUB_WORKSPACE/.github/scripts/Linux/ffmpeg-patches/*patch; do
         git apply $n
 done
 ./configure --disable-static --enable-shared --enable-gpl --enable-libx264 --enable-libx265 --enable-libopus --enable-nonfree --enable-nvenc --enable-libaom --enable-libvpx --enable-libspeex --enable-libmp3lame --enable-libsvthevc --enable-libsvtav1 \
+        --enable-librav1e \
         --enable-libsvtvp9 \
 
 make -j $(nproc)

.github/scripts/Linux/prepare.sh

@@ -28,10 +28,20 @@ sudo apt install libspeexdsp-dev
 sudo apt install libssl-dev
 sudo apt install libasound-dev libjack-jackd2-dev libnatpmp-dev libv4l-dev portaudio19-dev
 
+# updates nasm 2.13->2.14 in U18.04 (needed for rav1e)
+update_nasm() {
+        if [ -z "$(apt-cache search --names-only '^nasm-mozilla$')" ]; then
+                return
+        fi
+        sudo apt install nasm- nasm-mozilla
+        sudo ln -s /usr/lib/nasm-mozilla/bin/nasm /usr/bin/nasm
+}
+
 # for FFmpeg - libzmq3-dev needs to be ignored (cannot be installed, see run #380)
 FFMPEG_BUILD_DEP=`apt-cache showsrc ffmpeg | grep Build-Depends: | sed 's/Build-Depends://' | tr ',' '\n' |cut -f 2 -d\  | grep -v libzmq3-dev`
 sudo apt install $FFMPEG_BUILD_DEP
 sudo apt-get -y remove 'libavcodec*' 'libavutil*' 'libswscale*' libvpx-dev 'libx264*' nginx
+update_nasm
 sudo apt --no-install-recommends install asciidoc xmlto
 
 sudo apt install libopencv-dev

.github/scripts/Linux/rav1e.sh

@@ -0,0 +1,10 @@
+#!/bin/sh -eux
+#
+# Builds rav1e but doesn't install it
+
+cargo install cargo-c
+git clone --depth 1 https://github.com/xiph/rav1e.git
+cd rav1e
+cargo build --release
+cargo cinstall --release --destdir=install
+