=> Cortar video:
ffmpeg -ss 00:00:38 -t 00:02:00 -i entrada.mp4 -vcodec copy -an saida.mp4

=> Mesclar audio e video:
ffmpeg -i audio.aac -i video.mp4 -acodec copy -vcodec copy -f mp4 video-final.mp4

=> Mesclar video sem som:
ffmpeg -f concat -safe 0 -i lista.txt -c copy -an saida.mp4

=> Mesclar video com som:
ffmpeg -f concat -safe 0 -i lista.txt -c copy saida.mp4

=> Se aparecer mensagem de "Non-monotonous DTS":
ffmpeg -use_wallclock_as_timestamps 1 -safe 0 -f concat -i lista.txt out.mp4

=> Remover metadata:
ffmpeg -i video_entrada -c:v copy -c:a copy -map_metadata -1 video_saida

=> Slideshow:
ffmpeg -framerate 1/5 -pattern_type glob -i '*.jpg' -c:v libx264 -r 30 slide.mp4

ffmpeg -framerate 1/5 -pattern_type glob -i '*.jpg' -c:v libx264 -pix_fmt yuv420p out.mp4

=> Slideshow com audio:
ffmpeg -framerate 1/2 -pattern_type glob -i '*.jpg' -i audio.mp3 -c:v libx264 -c:a aac -strict experimental -b:a 192k -shortest out.mp4

=> Mesclar audio:
cat *.mp3 >> saida.mp3 (ou m4v)