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audio - Properly downmix 5.1 to stereo using ffmpeg ...
https://superuser.com/questions/852400/properly-downmix-5-1-to-stereo-using-ffmpeg
To downmix an audio stream to stereo and transcode it to the AC3 codec, for example: ... If you want a more high quality downmix, or you absolutely must include the LFE stream into your output, you can use FFmpeg's audio filter switch (-af) to downmix the audio using a custom mix formula.
How to overlay/downmix two audio files using ffmpeg ...
https://stackoverflow.com/questions/14498539/how-to-overlay-downmix-two-audio-files-using-ffmpeg
The amix filter helps to mix multiple audio inputs into a single output. If you run the following command: ffmpeg -i INPUT1 -i INPUT2 -i INPUT3 -filter_complex amix=inputs=3:duration=first:dropout_transition=3 OUTPUT. This command will mix 3 input audio streams (I used two mp3 files, in the example below) into a single output with the same ...
ffmpeg downmix 7.1 -> 5.1 - Doom9's Forum
https://forum.doom9.org/showthread.php?t=181635
ffmpeg downmix 7.1 -> 5.1 Audio encoding
FFMPEG transcode/downmix audio stream > 2 audio output ...
https://discussion.mcebuddy2x.com/t/ffmpeg-transcode-downmix-audio-stream-2-audio-output-streams-fails/292
I am using the H264_NVENC encoder and thus must utilize ffmpeg for this function - namely to transcode/downmix the single DTS 5.1 source audio stream to both an AAC2.0 and AC35.1 output audio streams. I have configured the profiles.conf with the appropriate ffmpeg audio config to provide for this function:
FFMPEG audio channel manipulation
https://blog.otterbro.com/ffmpeg-audio-channel-manipulation/
Hopefully this will give you a few tools to use when you need to modify or downmix audio in your files :) If you've ever tried to downmix 5.1 audio into a stereo mix, typically using this: ffmpeg -i 6channels.wav -ac 2 stereo.wav. Then you know that there are certainly some pitfalls there. By default it just straight up drops the LFE (low ...
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