FFMPEG get mono WAV audio 8khz 16 bit out of mp4 video

ffmpeg

I need to extract audio out of MP4 video file using FFMPEG. Just extracting audio is easy enough but I can't figure out the right parameters to get audio in mono 8khz 16 bit.

Basically I need to take all of the audio channels out of the video file and merge them into a mono 8khz 16 bit file. Is it possible to do so with FFMPEG?

I tried running

ffmpeg -i video.mp4 -acodec pcm_s16le -ac 2 audio.wav

Bit it's not giving me the exact result I want.

Best Answer

Use -ac 1 (See the FFmpeg wiki, or the man page with man ffmpeg) to limit the output to one channel.

Then use -ar 8000 for 8kHz and -acodec pcm_s16le for 16 bit.

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The basic command is:

ffmpeg -i filename.mp4 filename.mp3

ffmpeg -i video.mp4 -b:a 192K -vn music.mp3

Check this URL: MP4 Video to MP3 File Using ffmpeg (Ubuntu 9.10 Karmic Koala)

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FFMPEG: extract audio with exact frame length of video

I've found the solution to my problem. The "apad" filter together with the "-shortest" tag will extend a sound track to the same length of a video track in ffmpeg.

This is how to use the apad filter in the windows command line (video and audio codec parameters are just examples):

"C:\Program Files (x86)\FFMPEG\bin\ffmpeg.exe" -i PATH/TO/INPUTVIDEO -filter_complex "[0:1]apad" -vcodec prores -profile:v 3 -acodec pcm_s24le -ar 48000 -shortest PATH/TO/OUTPUTVIDEO

More about the apad filter in the ffmpeg documentation: https://www.ffmpeg.org/ffmpeg-filters.html#apad

Best Answer

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