ffmpeg commands

ffmpeg.txt

#Cut/Edit video
#              input file          start       end                 output file
#ffmpeg -i inputfilename.mp4 -ss 00:00:03 -t 00:00:08 -async 1 outputfilename.mp4

#Combine videos into single file
#        pathToVideos
for f in Videos/*; do   echo "file '$f'"; done >> files.txt
./ffmpeg -f concat -safe 0 -i files.txt -c copy output.mp4
rm files.

#can run this if the console supports substitution
ffmpeg -f concat -safe 0 -i <(for f in ./*.wav; do echo "file '$PWD/$f'"; done) -c copy output.wav

#Resize videos source: https://unix.stackexchange.com/questions/28803/how-can-i-reduce-a-videos-size-with-ffmpeg
ffmpeg -i input.mkv -vf "scale=iw/2:ih/2" half_the_frame_size.mkv
ffmpeg -i input.mkv -vf "scale=iw/3:ih/3" a_third_the_frame_size.mkv
ffmpeg -i input.mkv -vf "scale=iw/4:ih/4" a_fourth_the_frame_size.mkv