Upgrade base image from xenial to bionic (ffmpeg upgrade to 4.3)

Dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:xenial
+FROM ubuntu:bionic
 
 LABEL maintainer="[email protected]"
 
@@ -18,9 +18,10 @@ RUN apt-get update && \
     apt-get --no-install-recommends install -yqq \
     wget \
     software-properties-common \
-    curl
+    curl \
+    gpg-agent
 
-RUN add-apt-repository ppa:mc3man/xerus-media && \
+RUN add-apt-repository ppa:mc3man/bionic-prop && \
     curl -sL https://deb.nodesource.com/setup_14.x | bash - && \
     wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add - && \
     echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google-chrome.list
@@ -42,7 +43,7 @@ RUN npm install && \
 
 COPY . .
 
-RUN apt-get purge curl -y && \
+RUN apt-get purge curl gpg-agent -y && \
     apt-get clean -y && \
     apt-get autoremove -y && \
     rm -rf /var/lib/apt/lists/*

main.js

@@ -39,7 +39,7 @@ function getStartRecordingCommand () {
         `-s ${process.env.OUTPUT_VIDEO_WIDTH}x${process.env.OUTPUT_VIDEO_HEIGHT} ` +
         '-thread_queue_size 4096 ' +
         '-i :1 ' +
-        '-f pulse ' +
+        '-f alsa ' +
         '-i default ' +
         '-c:v libx264 ' +
         '-tune zerolatency ' +