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How to overlay/downmix two audio files using ffmpeg ...
https://stackoverflow.com/questions/14498539/how-to-overlay-downmix-two-audio-files-using-ffmpeg
For merging two audio files with different volumes and different duration following command will work: ffmpeg -y -i audio1.mp3 -i audio2.mp3 -filter_complex "[0:0]volume=0.09[a];[1:0]volume=1.8[b];[a][b]amix=inputs=2:duration=longest" -c:a libmp3lame output.mp3
ffmpeg add two audio streams to video - Super User
https://superuser.com/questions/508331/ffmpeg-add-two-audio-streams-to-video
ffmpeg -i /sdcard/video/transcode/video.avi -map 0:0,0 -i /sdcard/video/transcode/first.mp3 -map 1:0,1 -i /sdcard/video/transcode/second.mp3 -map 2:0,2 -acodec copy -vcodec py /sdcard/video/transcode/Output.avi to add two audio streams to one video file. But ffmpeg says the number of mappings should match the number of output streams.
ffmpeg Merge two Audio Streams into one · GitHub
https://gist.github.com/LukasKnuth/4d7ee6812ccb221b2775e984516b56d4
Fork 1. Star. ffmpeg Merge two Audio Streams into one. Raw. Readme.md. This script takes a single input file and. Reduces the volume of the third audio-track in the file by half. Writes the reduced volume track into l. Mixes both the second audio-track and the lowered l -track together and stores them into a.
FFMPEG convert video with multiple audio streams?
https://video.stackexchange.com/questions/12051/ffmpeg-convert-video-with-multiple-audio-streams
-c:a -> select best supported audio (transcoded) -c:a copy -> best supported audio (copied) -map 0:a -> all audio from 1st input file (transcoded) -map 0:0 -> 1st stream from 1st input file (transcoded) -map 1:a:0 -> 1st audio stream from 2nd input file (transcoded) -map 1:a:1 -c:a copy -> 2nd audio stream from 2nd input file (copied)
How to add multiple audio tracks to a single video using ...
https://medium.com/av-transcode/how-to-add-multiple-audio-tracks-to-a-single-video-using-ffmpeg-open-source-tool-27bff8cca30
FFmpeg is a free and open-source project consisting of powerful audio and video converter software suite of libraries and programs for handling video, audio, and other multimedia files and streams.
Audio Stream Mixing in FFMPEG - VideoHelp Forum
https://forum.videohelp.com/threads/355836-Audio-Stream-Mixing-in-FFMPEG
Code: ffmpeg -i INPUT.mov [video output commands] -filter_complex " [0:1] [0:2] [0:3]amerge=inputs=3" [audio output commands] -y OUTPUT.mp4. I tried this with success but the input streams were all stereo. I don't know what FFmpeg …
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