Extract MP3 (audio) from FLV (video) with No Loss

Code
ffmpeg -i myvideo.flv -vn -acodec copy output.mp3



Extract MP3 (audio) from Every FLV (video) File in a Directory with No Loss

Code
FOR /f %%a IN ('dir /b *.flv') DO ffmpeg -i %%a -vn -acodec copy %%a.mp3



Requirements:

(1) ffmpeg must be installed.

(2) The user's PATH environment variable must point to ffmpeg. Example:
PATH=C:\Program Files\Microsoft Visual Studio\Common\Tools\WinNT;C:\Utilities\ffmpeg
To change this, go to Control Panel > System > Advanced System Settings > "Advanced" tab

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