WIP First attempt to generate video pre rolls

.gitignore

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+/output/*/*.mp4
+/output/*/*.txt

Makefile

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+# Based on: https://stackoverflow.com/questions/17166739/how-to-display-image-for-particular-time-in-a-video-using-ffmpeg
+
+TARGET=$@
+SHELL=/bin/bash
+
+.DEFAULT_GOAL: all
+
+.PHONY: all
+all: output/pre-roll/total.mp4
+
+output/pre-roll/total.mp4: \
+	output/pre-roll-slides/pre-roll.txt
+	ffmpeg \
+		-f concat \
+		-i output/pre-roll-slides/pre-roll.txt \
+		-y \
+		-codec copy $(TARGET)
+
+output/pre-roll-slides/pre-roll.txt: \
+	output/pre-roll-slides/1-intro.mp4 \
+	output/pre-roll-slides/3-sponsors.mp4
+	ls output/pre-roll-slides \
+		| grep -v '.txt' \
+		| awk '{print "file \x27"$$0"\x27"}' \
+		> $(TARGET)
+
+output/pre-roll-slides/1-intro.mp4: \
+	input/pre-roll-slides/1-intro.png
+	ffmpeg \
+		-loop 1 \
+		-f image2 \
+		-i input/pre-roll-slides/1-intro.png \
+		-c:v libx264 \
+		-t 5 \
+		-y \
+		$(TARGET)
+
+output/pre-roll-slides/3-sponsors.mp4: \
+	input/pre-roll-slides/3-sponsors.png
+	ffmpeg \
+		-loop 1 \
+		-f image2 \
+		-i input/pre-roll-slides/3-sponsors.png \
+		-c:v libx264 \
+		-t 5 \
+		-y \
+		$(TARGET)