You say you want to "extract audio from them (mp3 or ogg)". But what if the audio in the mp4 file is not one of those? you'd have to transcode anyway. So why not leave the audio format detection up to ffmpeg? To convert one file: ffmpeg -i videofile.mp4 -vn -acodec libvorbis audiofile.ogg To convert many files:
This free-to-use video converter is compatible with Windows PC and allows converting almost all types of videos to MP4 and MKV format with support for an array of encoders. Using the free video converter to MP4, you can also convert videos from Blu-ray and DVDs. There is an option for live static and video preview to check the output file.
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FFmpeg is an open-source, command line based video transcoding software. For users familiar with command line tools, FFmpeg is a great choice to turn MP4 into animated GIF on Windows or on Mac. Step 1. Install FFmpeg on Windows or on Mac. Step 2. Open the command prompt on Windows, or the terminal tool on Mac. Step 3.
More Features on the Alternative to HandBrake MP3 Converter. 1. This conversion software can not only compensate for the defect of HandBrake won't extract audio, but also support the newest encoder H265 (HEVC), or you can convert your video to H265 directly. 2. Add subtitles to either the movie video or the music video to have fun.

Transcoding is the conversion of a digital media file, such as a video or audio file, from one format to another. This is usually done by decoding and then re-encoding the file. For example, you might convert a Windows Media file to MP4 so that it can be played on a portable device that supports MP4 format.

An mp4 to mp3 converter is a simple tool that allows you to quickly and easily convert mp4 files into mp3 files at the click of a button. mp4 files formats contain both video and audio but mp3 file formats only contain audio. This means an mp4 file is converted into an mp3 file by simply stripping away the video content.
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convert mp4 to audio only windows