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This is a great, free, and simple online option for converting the video file to audio. :) https://convertio.co/mp4-mp3/ More on reddit.com

You may or may not actually need to convert anything here. MP4 is just a container, and the audio stream inside it may already be MP3. Or it may be AAC or some other codec. I would use FFmpeg . If you're okay with using the command line, it's very powerful. You can inspect the file with > ffmpeg -i video.mp4 and you'll see something like Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf56.25.101 Duration: 00:00:52.67, start: 0.000000, bitrate: 909 kb/s Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 780x480 [SAR 1:1 DAR 13:8], 775 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default) Metadata: handler_name : VideoHandler Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default) Metadata: handler_name : SoundHandler If the audio (in this case, stream 0:1), is already MP3, you can just copy it out: > ffmpeg -i video.mp4 -map 0:1 -c copy audio.mp3 If it's some other codec, this will reencode: > ffmpeg -i video.mp4 -map 0:1 audio.mp3 More on reddit.com

would "ffmpeg -i input.mp4 -vn audio_only.mp3" work?

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