dtsig wrote:EX Audio Converter from Poikosoftis one of the best products I have ever bought. It isn't free but it is the best why dodn't you mention it costs $50? ... Look no further. This is what you seek: HERE btw - there's nothing wrong with mp3 as long as you are 192br or higher (fairly small sizes and compatibility can't be beat) If you want to use mp4... More on mediamonkey.com

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

What about Handbrake? More on reddit.com