ffmpeg extract audio from mp4 without loss

For instance, a DVD may have a menu in Title 1, an advertisement in Title 2, the main content in Title 3, and a trailer in Title 3.

Is the source a DVD, or other container with internal structure, such as multiple 'Titles', and multiple 'Chapters' in each Title? If so, then you need to identify which Title and Chapters include the audio content you want, and which are irrelevant. Where VLC really shines is for sources which combine video and audio content. For instance, the FLAC tools include a command-line utility which can convert WAV files into FLAC files with excellent speed and reliability. Be aware that, while VLC has certain facility for this task, other tools may be even more powerful, faster, or more reliable for the task. Is the source an audio-only file? If so, then this operation is a simple transcoding of audio content from one format to another. You will open this source from VLC using the same GUI operations or command-line options as you would for any other VLC usage.

Identify the source from which you want to extract the audio signal.

3.6 Scripting extraction of multiple chapters using a batch file.

3.5.1 Extracting audio in original format.2 Using the VLC graphical user interface (GUI).

Ffmpeg extract audio from mp4 without loss