On Sun, 23 Apr 2017 16:42:56 -0300, pjp
wrote:

In article ,
says...

In message , Shadow
writes:
I'll repeat an older post I made, slightly more detailed.

MP4 (like most other video formats) is a container. It usually
contains a video stream and an audio stream, but it might contain
subtitle or other streams.

To determine exactly what streams your .MP4 contains, you need a tool
like Mediainfo Lite.

http://mediaarea.net/en/MediaInfo/Download/Windows

To determine the streams, yes; to do what the OP wanted (extract the
audio), no. Although what you've explained/described is a good way to do
it. But - given that the post was/is in Windows 'groups - I think the OP
would probably prefer a GUI method. (Of which I've posted three, and
others have others.) Granted, the three I use don't make it _obvious_
how to do an extraction without recoding, though I think they _can_.
[]
You will find most music from YouTube and other sites is
****-awful in quality. Usually 96.0 kb/s. You can see that with
Mediainfo before extracting, of course, but Mediainfo gives you the
nominal value, Spek does a full analysis.
HTH
[]'s
Depends what it is wanted for. For listening to on a variety of the
portable devices around now, 96k probably can be acceptable for some
material.

I believe Any Audio Converter will accept a mp4 file and spit out just
the audio. Not that I've tried to do that but memory serves me right I
once made the mistake of dropping a mp4 file into it rather than Any
Video Converter and it started doing the conversion so ???

Well, I just extracted the sound from a 1 hour video. It took
exactly 8 seconds, on my 10 year old PC.
If Any Audio Converter takes the same time (or less, on a
faster CPU) it's copying, more than that, it's converting.
Conversion always implies loss of quality.
[]'s
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