Super tip: You can create an AWS Lambda layer with a static build of ffmpeg and perform these actions from within Lambda
Remove the audio track from an MP4 and save as output.mp4
ffmpeg -i input.mp4 -an output.mp4
Check the internal integrity of video mp4 using ffmpeg
ffmpeg -v error -i input.mp4 -f null - 2>error.log
Extract and save a segment from the middle of an MP4
ffmpeg -i input.mp4 -ss 0 -t 779 -vcodec copy -acodec copy seg1.mp4
Extract all audio and video after the 788 second mark from an MP4
ffmpeg -i input.mp4 -ss 788 -vcodec copy -acodec copy seg2.mp4
Generate an optimized animated gif of the first 10 seconds of a video
ffmpeg -y -t 10 -i input.mp4 -filter_complex "fps=10,scale=720:-1:flags=lanczos,split[s0][s1];[s0]palettegen=max_colors=50[p];[s1][p]paletteuse=dither=bayer" output.gif
Get the duration of a video
ffmpeg -i out.mp4 2>&1 | grep "Duration"| cut -d ' ' -f 4 | sed s/,// | sed 's@\..*@@g' | awk '{ split($1, A, ":"); split(A[3], B, "."); print 3600*A[1] + 60*A[2] + B[1] }'
Take an audio only resource, add a black screen video track to it using loop.jpg as background and save as MP4
ffmpeg -loop 1 -i loop.jpg -i audio.mp3 -shortest -c:v libx264 -c:a copy final.mp4
Convert an audio-only MP4 to MP3 format
time ffmpeg -i input.mp4 -q:a 0 -map a out.mp3