FFmpeg

trim ffmpeg -ss 00:00:00 -i ErynaCat5.mp4 -to 00:00:30 -c copy ErynaCat6.mp4 scale x2 ffmpeg -i input.mp4 -vf scale=iw*2:ih output.mp4 downscale /2 ffmpeg -i input.mp4 -vf "scale=iw/2:ih/2" output.mp4 Encode the audio to AAC ffmpeg -i input.mov -c:v copy -c:a aac output.mp4 analyse volume ffmpeg -i input.wav -filter:a volumedetect -f null /dev/null change volume ffmpeg -i input.wav -filter:a "volume=10dB" output.wav

https://ottverse.com/change-resolution-resize-scale-video-using-ffmpeg/

https://trac.ffmpeg.org/wiki/AudioVolume