ffmpeg map 2nd soundtrack to output file

Convert video from one format to anotherįfmpeg -ss 30 -t 3 -i input.mp4 -vf 'fps=10,scale=480:-1:flags=lanczos,split palettegen paletteuse' -loop 0 output.gif.I’m still a beginner in this, so if you do notice any errors, please comment.ĭocumenting this is both a note for myself and hopefully may help othersįind this by googling (it was surprisingly difficult to find this combination). ac 2 sets output audio to have 2 channels (stereo).q:a 3 is VBR quality 3 for the LAME codec.

c:a libmp3lame uses LAME to convert the audio to MP3, here you could use.c:v copy sets video codec to copy which just copies it without changing.We use the original video as video track and the filtered audio a as the

map switches select the used video and audio tracks for the output.

Need to modify the 2 and the inputs if you had more than 2 audio tracks

amerge=inputs=2 merges the given 2 input audio tracks.

selects both the 0th input file’s 0th audio track and l from.

volume=0.1 lowers the volume (this can also use dB units) and puts.

picks the 0th input file’s 1st audio track as input for the filter.

SoĪ filter with two inputs looks like this: filter. Inside it,įilters have inputs and outputs that are the parts in square brackets.

filter_complex is a series of filters that operates on the input.

My understanding of the command is as follows: On the mic track (track 1), and copies the video data without re-encoding: ffmpeg -i 'input.mkv' -filter_complex 'volume=0.1 amerge=inputs=2' -map '0:v:0' -map '' -c:v copy -c:a libmp3lame -q:a 3 -ac 2 'output.mp4' ThisĬommand merges the audio tracks in the input video, lowers the volume This is just a quick post to store the command I used to do that. I was surprised to find that multi-track files were not properly supportedīy many programs like Handbrake (or YouTube for that matter), so I needed to OBS writes two audio tracks to the file, one for game audio and one for my I use OBS Studio to store replays of my games with my friends for later. Combining Audio Tracks in a Video With Ffmpeg – Random Notes Random NotesĬombining Audio Tracks in a Video With Ffmpeg

Ffmpeg map 2nd soundtrack to output file