FFMPEG Tricks

Merging Multiple Audio Tracks

Useful for gamerips where music is split into multiple tracks for dynamic mixes and need to be merged together for a true track.

amerge is more flexible than amix so prefer using amerge.

-ac is to set the number of audio channels (e.g. -ac 2 for stereo)

ffmpeg -i layer-1.ogg -i layer-2.ogg -filter_complex amerge=inputs=2 -ac 2 output.mp3

ffmpeg -i video.mp4 -vf "fps=10,scale=800:-1:flags=lanczos,split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" -loop 0 video.gif

Add the following to the command and adjust as needing. scale=<width>:<height> where -1 automatically sets the value to maintain aspect ratio.

 -filter:v scale=1280:-1 -c:a copy

Add the following to the command.

-an