Why this may be needed?For example, you don’t know the name of a music artist who sounds in a video. Then, you can extract audio track from the video and upload it in some services to define music.And what if the sound in the video in a good quality? Then we can extract this audio without sacrificing quality, without re-encoding.This is a very useful trick, especially for Linux users. Having mastered this method once, we can use it at anytime we want. It doesn’t require any huge programs.
Ffmpeg libraries are used in many media players, so maybe you already have it installed on your Linux system as dependencies for applications.Note that ffmpeg is available on many systems, including Windows. Extract audio without loss of qualityHow it works? Why there is no loss of quality?
Timing is all wrong when extract srt subtitle from video: open defect normal git-master #7915 ffmpeg-vaapi jpeg encode failed when build with gcc 9.1.1 on Fedora 30: new defect normal git-master. Closed captions in movtext in f4v: new enhancement wish.
Ffmpeg Extract Subtitles
The fact is that this method simply copies the audio track from the video into a separate audio file. Therefore, there is no encoding here. This method is the fastest and highest in quality.
From.mp4 videosIn.mp4 video files audio track is often presented as AAC stream.