Old 12-01-2015, 08:27 AM   #1
Antebios
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Default Extract Audio from an MP4

I'm not sure if this is the right forum, but how do you go about extracting the audio from an MP4?
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Old 12-01-2015, 08:36 AM   #2
Joaquins Void
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VLC can do it, but I can't remeber how right now.
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Old 12-01-2015, 08:40 AM   #3
nofish
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http://www.pazera-software.com/produ...dio-extractor/
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Old 12-01-2015, 09:31 AM   #4
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Have you already tried opening the file in REAPER? That might "just work".

Audacity can usually do it (with the optional FFMPEG import/export library).

TAudioConverter can usually do it.

SUPER can do it (with or without converting the audio to a different format).

Last edited by DVDdoug; 12-03-2015 at 07:56 PM.
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Old 12-01-2015, 11:36 AM   #5
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I had trouble opening MP4's in Reaper.

But Foobar2000, which is freeware can do the conversion.
http://foobar2000.org

Load up your MP4's or M4A's or AAC's or WebM's or MKV's or OGG's or MP3's or whatnot and convert them to whichever other format. It's really pretty powerful. You can edit the meta data before and after too.

Be sure to edit/save the conversion settings before you commit to them.
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Old 12-01-2015, 12:46 PM   #6
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Quote:
Originally Posted by nofish View Post
The one you pointed me to worked great. Thanks.
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Old 12-01-2015, 01:41 PM   #7
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You can probably just convert the MP4 to any audio format with Reapers batch converter. Find it in the file menu. You may need to have VLC installed as well. X64 Reaper -> X64 VLC.
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Last edited by airon; 12-01-2015 at 01:54 PM.
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Old 12-01-2015, 01:45 PM   #8
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I use Blender for that. It actually has a pretty decent video editor in it these days.

Never had any luck with VLC conversions, something always wrong with the wrapper.
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Old 12-01-2015, 09:42 PM   #9
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Default Ff Mp Eg

FFmpeg will do that and much, much more.

Code:
ffmpeg -i input.mp4 -vn -c:a copy output.m4a
Will copy out the AAC to m4a no transcoding or quality loss.

ZeraNoe has the Windows builds I use.
Mac builds that I haven't used.
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Old 12-03-2015, 01:05 PM   #10
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Quote:
Originally Posted by toddhisattva View Post
FFmpeg will do that and much, much more.

Code:
ffmpeg -i input.mp4 -vn -c:a copy output.m4a
Will copy out the AAC to m4a no transcoding or quality loss.

ZeraNoe has the Windows builds I use.
Mac builds that I haven't used.
Nice tip for quick stream extraction. Thanks.
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Old 12-05-2015, 08:11 AM   #11
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I seem to remember that Adobe Audition reads the audio directly from an mp4 file. I will try it if I get a chance or could someone confirm/refute this?
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Old 10-10-2018, 01:37 AM   #12
hlavsa
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Default Separation of audio and video

Separation of audio from video track is easy: Item - right click - Item Processing - Explode multichannel audio to...
That will create separate audio subtracks (WAV) which you can easily drag anywhere in you project.
Also very handy is muting audio in original track: Item - right click - Source properties (Ctrl-F2) - check "Ignore audio".
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Old 05-11-2020, 10:54 PM   #13
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Many thanks for this, it worked fine for me the other day BUT this morning I got this error, any ideas? -

Multi-channel explode - "Error creating new single-channel media items"
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Old 05-14-2020, 10:57 PM   #14
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Quote:
Originally Posted by mikefloutier View Post
Many thanks for this, it worked fine for me the other day BUT this morning I got this error, any ideas? -

Multi-channel explode - "Error creating new single-channel media items"
Any ideas? I'm left this project on the back burner for a few days in the hope of inspiration (or hopefully you guys - no pressure ) but I revisited this morning.

I do need to do this as it's fundamental to the project - seems such a simple thing; what am I missing?

It's a standard mp4 file with video at 1280x720 30fps with Audio: 48kHz stereo 192kbps.

I obtained the file by recording it from a larger file in VLC media player.

Any ideas?
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Old 05-16-2020, 10:40 AM   #15
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Quote:
Originally Posted by mikefloutier View Post
Any ideas? I'm left this project on the back burner for a few days in the hope of inspiration (or hopefully you guys - no pressure ) but I revisited this morning.

I do need to do this as it's fundamental to the project - seems such a simple thing; what am I missing?

It's a standard mp4 file with video at 1280x720 30fps with Audio: 48kHz stereo 192kbps.

I obtained the file by recording it from a larger file in VLC media player.

Any ideas?
This sounds like a problem to me. I use Reaper to extract audio from MP4 every day on OS X and it works without me having to do anything. I also just set up a friend on Windows with Reaper and audio extraction was working fine. Maybe double-check that LAME is up to date and properly installed? Or select the audio and render it as a WAV?

Last edited by nepenthe; 05-16-2020 at 10:42 AM. Reason: more info
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Old 05-16-2020, 09:26 PM   #16
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Thanks nepenthe, it worked ok next time (after I’d found a workaround ) some glitch.
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Old 05-16-2020, 09:39 PM   #17
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You don't even need to explode it, just glue the item and you'll be left with only the audio.
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Old 09-19-2020, 07:24 PM   #18
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Quote:
Originally Posted by fakemaxwell View Post
You don't even need to explode it, just glue the item and you'll be left with only the audio.
This glue idea works great. You can even glue just one lone item to itself. The only downside is that it creates more files. I don't know why the explode multichannel audio is greyed out.
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Old 09-20-2020, 02:08 PM   #19
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I've never been able to open m4a files in Reaper, and end up using Audacity to convert them to wav or flac.

But mp4 files open without problem and the audio can then be extracted.
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