Update and simplify recording image build (#647)

Simpler video recorder image

selenium/video/Dockerfile

@@ -1,21 +1,7 @@
-FROM alpine:3.12
+FROM alpine:3
 
-RUN apk add -U alpine-sdk && adduser -g "" -D -G abuild selenoid
-USER selenoid
-RUN git clone git://git.alpinelinux.org/aports /home/selenoid/aports
-ADD APKBUILD /home/selenoid/aports/community/ffmpeg/
-RUN cd /home/selenoid/aports/community/ffmpeg/ && \
-    abuild checksum && \
-    abuild unpack && \
-    abuild deps && \
-    abuild build
-USER root
-
-FROM alpine:3.12
-
-RUN apk add -U x264-libs sdl2 libxcb libbz2 xset pulseaudio-utils && \
+RUN apk add -U x264-libs sdl2 libxcb libbz2 xset pulseaudio-utils ffmpeg && \
     rm -rf /var/cache/apk/*
-COPY --from=0 /home/selenoid/aports/community/ffmpeg/src/ffmpeg-4.3/ffmpeg /usr/bin/ffmpeg
 
 COPY entrypoint.sh /
 ENTRYPOINT ["/entrypoint.sh"]

selenium/video/entrypoint.sh

@@ -36,7 +36,7 @@ echo -n 'gIvST5iz2S0J1+JlXC1lD3HWvg61vDTV1xbmiGxZnjB6E3psXsjWUVQS4SRrch6rygQgtpw
 export PULSE_SERVER=${BROWSER_CONTAINER_NAME}
 
 if pactl info >/dev/null 2>&1; then
-  exec ffmpeg -f pulse -i default -y -f x11grab -video_size ${VIDEO_SIZE} -r ${FRAME_RATE} ${INPUT_OPTIONS} -i ${BROWSER_CONTAINER_NAME}:${DISPLAY} -codec:v ${CODEC} ${PRESET} -pix_fmt yuv420p -filter:v "pad=ceil(iw/2)*2:ceil(ih/2)*2" "/data/$FILE_NAME"
+  exec ffmpeg -f pulse -thread_queue_size 1024 -i default -y -f x11grab -video_size ${VIDEO_SIZE} -r ${FRAME_RATE} ${INPUT_OPTIONS} -i ${BROWSER_CONTAINER_NAME}:${DISPLAY} -codec:v ${CODEC} ${PRESET} -pix_fmt yuv420p -filter:v "pad=ceil(iw/2)*2:ceil(ih/2)*2" "/data/$FILE_NAME"
 else
   exec ffmpeg -y -f x11grab -video_size ${VIDEO_SIZE} -r ${FRAME_RATE} ${INPUT_OPTIONS} -i ${BROWSER_CONTAINER_NAME}:${DISPLAY} -codec:v ${CODEC} ${PRESET} -pix_fmt yuv420p -filter:v "pad=ceil(iw/2)*2:ceil(ih/2)*2" "/data/$FILE_NAME"
 fi