Ubuntu 14.04 does not have ffmpeg in standard repositories, but you could add ppa:mc3man/trusty-media repository and install ffmpeg package to get the needed software. For other codecs than mp3 and vorbis it converts audio to ogg. Notes: the output files are created in sub-directory output it creates in the beginning (if necessary). ffmpeg -loop 1 -i input.jpg -i input.mp3 -vf 'scale1920:1080:forceoriginalaspectratiodecrease,pad1920:1080:-1:-1:colorblack,setsar1,formatyuv420p' -shortest -fflags +shortest output.mp4. To convert many files: for vid in *.mp4 do ffmpeg -i '$vid' -vn -acodec libvorbis '$'.ogg To convert one file: ffmpeg -i videofile.mp4 -vn -acodec libvorbis audiofile.ogg ffmpegHow to batch convert FLAC to MP3 for i in (ls. So why not leave the audio format detection up to ffmpeg? FFmpeg Batch AV Converter is a free universal audio and video encoder, that allows to use. But what if the audio in the mp4 file is not one of those? you'd have to transcode anyway.

With ffmpeg, unless specified otherwise, the extension of the output defines the format used for the conversion, so just because the output ends with. You say you want to 'extract audio from them (mp3 or ogg)'. If you use a.mp3, a 12345.mp4 file will be transcoded as 3, because a refers to the complete name, including the extension.

Ffmpeg batch convert mp4 to mp3