add fmpeg

Dockerfile

@@ -2,7 +2,7 @@ FROM debian:9.2
 
 MAINTAINER christopher@chris-latza.de
 
-RUN apt-get update && apt-get install -y php-cli
+RUN apt-get update && apt-get install -y php-cli ffmpeg
 RUN mkdir /data
 ADD getPreview.php /data/getPreview.php
 WORKDIR /data

getPreview.php

@@ -99,6 +99,7 @@ while(true)
     file_put_contents($imageFileName, file_get_contents($previewURL, false, $globalData['sslContext']));
     echo "done\n";
 
+    system("ffmpeg -f image2 -framerate 2 -i /data/images/%07d.jpg -r 25 -vcodec libx264 /data/images/video.mp4");
     sleep(300);
 }