Use my own mirror for ffmpeg and x264 repos

ffmpeg/Makefile

@@ -1,11 +1,13 @@
 SHELL:=/bin/bash
 
 ubuntu1804:
-	# git clone git://git.videolan.org/x264.git
-	#git clone https://github.com/rayburgemeestre/x264
+	# sometimes got 404 on videolan/x264
+	#git clone https://code.videolan.org/videolan/x264
+	#git clone git://source.ffmpeg.org/ffmpeg.git
 
-	git clone https://code.videolan.org/videolan/x264
-	git clone git://source.ffmpeg.org/ffmpeg.git
+	# for this reason pushed them to my own github
+	git clone https://github.com/rayburgemeestre/x264
+	git clone https://github.com/rayburgemeestre/ffmpeg
 
 	bash ../ubuntu1804.sh make ffmpeg_impl