ffmpeg-composite-video-audio-fade.sh

#!/bin/bash

echo "Compositing files and ramping up video framerate"
echo "================================================"

rm -rf render && mkdir render

for file in *.mov; do
	# Ramp up video framerate, add audio
	ffmpeg \
		-i $file \
		-i music/${file%.*}.mp3 \
		-r 20 \
		-c:v libx264 \
		-preset ultrafast \
		-threads 8 \
		-filter:v setpts=0.2*PTS \
		-filter:a apad \
		-shortest \
		render/render-$file;

	# Audio fade in-out
	ffmpeg \
		-i render/render-$file \
		-r 20 \
		-c:v libx264 \
		-preset ultrafast \
		-threads 8 \
		-filter_complex afade=st=2:d=2,areverse,afade=d=2,areverse \
		render/render-fade-$file;

	echo "file 'render-fade-$file'" >> render/playlist.txt;
done

# Concat to single file
ffmpeg \
	-f concat \
	-i render/playlist.txt \
	-c copy \
	render/final.mov

rm render/render-fade-*.mov render/playlist.txt

echo "==============================================="
echo "Done compositing and ramping up video framerate"