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Old Feb 19, 2012, 03:00 PM   #51
Cjsimmons0
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Join Date: Feb 2012
Found fix

If you are looking to extract the audio from a mp4, just use ffmpegX to convert the mp4 into a FLV file. Once you have converted, use the program iExtractMP3 to convert to mp3. Works well and is VERY fast!
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Old Feb 29, 2012, 02:19 PM   #52
justytylor
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Join Date: Sep 2002
Location: Washington, DC
Solution: Extract audio from mp4

Okay: I'm assuming you have access to QuickTime Pro 7 (where the Command-J command works).

You will open the movie in QTPro 7.

Type Command-J (or choose "View -> Show Movie Properties").

The top pane of that window will have all the resources within the .mp4 file listed. You'll have a Video track and a sound track. Click on the sound track.

Click the "Extract" button. This will open just the sound track in a new QuickTime document window.

Choose "Export..." from the File menu.

In the Export dialog box, in the Export: pull down menu, choose "Movie to MPEG-4". Click the "Options..." button next to that pull-down menu.

In the next window, choose the "Audio" tab."

In the "Audio Format:" pull-down menu, choose "pass-through".

Click "OK" to commit that change and exit this dialog box.

Name your file, click "Save" and you'll have exactly what you want: an audio-only .mp4 file with no reencoding.
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Old May 15, 2012, 05:11 PM   #53
bleater
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Join Date: Jul 2008
Quote:
Originally Posted by justytylor View Post
Okay: I'm assuming you have access to QuickTime Pro 7 (where the Command-J command works).

You will open the movie in QTPro 7.

Type Command-J (or choose "View -> Show Movie Properties").

The top pane of that window will have all the resources within the .mp4 file listed. You'll have a Video track and a sound track. Click on the sound track.

Click the "Extract" button. This will open just the sound track in a new QuickTime document window.

Choose "Export..." from the File menu.

In the Export dialog box, in the Export: pull down menu, choose "Movie to MPEG-4". Click the "Options..." button next to that pull-down menu.

In the next window, choose the "Audio" tab."

In the "Audio Format:" pull-down menu, choose "pass-through".

Click "OK" to commit that change and exit this dialog box.

Name your file, click "Save" and you'll have exactly what you want: an audio-only .mp4 file with no reencoding.
I can confirm that this is the best way to achieve the desired result of extracting AAC audio from an MP4 file without re-encoding it and using only Apple-provided tools.

I would add only one more thing, which is when saving the file, give it the .m4a extension (or rename it with this extension once exported). That way, iTunes will correctly list it as "AAC audio file" rather than "MP4 video file" (even though it has no video track).
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Old May 31, 2012, 03:27 PM   #54
Sami.
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Join Date: May 2012
Solution

Use TSmuxer.
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Old Jun 22, 2012, 06:06 PM   #55
CJYetman
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Join Date: Nov 2002
great ideas.... thanks. but couldn't you just extract directly from the video file? another words, skip to the "Choose "Export.."" step and just make sure in the Options that on the "Video" tab you have the video format set to "none"?

I think that would do the same thing and make this a bit less complicated.
-cj


Quote:
Originally Posted by justytylor View Post
Okay: I'm assuming you have access to QuickTime Pro 7 (where the Command-J command works).

You will open the movie in QTPro 7.

Type Command-J (or choose "View -> Show Movie Properties").

The top pane of that window will have all the resources within the .mp4 file listed. You'll have a Video track and a sound track. Click on the sound track.

Click the "Extract" button. This will open just the sound track in a new QuickTime document window.

Choose "Export..." from the File menu.

In the Export dialog box, in the Export: pull down menu, choose "Movie to MPEG-4". Click the "Options..." button next to that pull-down menu.

In the next window, choose the "Audio" tab."

In the "Audio Format:" pull-down menu, choose "pass-through".

Click "OK" to commit that change and exit this dialog box.

Name your file, click "Save" and you'll have exactly what you want: an audio-only .mp4 file with no reencoding.
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Old Aug 10, 2012, 01:02 PM   #56
SkwidSpawn
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Join Date: Jan 2010
Here's how it worked for me

Here's how it worked for me under Mountain Lion, for anyone who finds this on Google and simply wants to pull the audio out of a movie file:

Open the file in Quicktime Player, then go to:
File->Export… (or hit command-shift-S)


Then select "Audio Only" from the Format drop-down:


Then Save it:


It appears to work as a pass-through rip, and I don't know if it works on every file, but it worked a charm on this one, pulling out 256kb/s aac audio.
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Old Dec 9, 2012, 02:23 PM   #57
smaghe
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Join Date: Dec 2012
Extract audio from multiple mp4

Hi everybody,

Thanks to the previous messages I was able to succeed in splitting the audio from the video.
However, I needed to automate the steps, as I had a lot of videos to split.

Here's the script that I wrote :

#!/bin/bash
for f in *.mp4; do
./ffmpeg -i "$f" -vn -acodec copy "${f%.mp4}.m4a"
done


For people who aren't so much into scripts, open Terminal, type "Nano"
Paste the script. Type Ctrl + X to close the editor, a prompt asking what to do will appear, save the file with ".sh" suffix.
Assuming you saved it in a convenient folder, navigate to the directory where the script is with the terminal. For example, script being in the Resources folder (mentioned in page 2), type :
cd Desktop/Resources/
Being in the folder, where your script and videos are, you then have to make the script executable; type :
chmod u+x nameofscript.sh
Then you just have to run the script in the same folder of the videos, to do so type :
./nameofthescript.sh


Thanks for the help that you gave me.
Cheers.


Stas
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Old Jun 12, 2013, 09:26 AM   #58
Elias Hedberg
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Join Date: Jun 2013
Quote:
Originally Posted by halfthelaw View Post
No, FCP.guru.guy, you really don't get what Canubis is trying to do.

Canubis, here's how I do what you're describing:
1. Get Rogue Amoeba's Fission
http://rogueamoeba.com/fission/
2. Open the movie file with Fission
3. Go to File > Save Audio and you will be able to save the audio track losslessly
Small update to halfthelaw’s post: with the latest version of Fission (2+) there is no "Save Audio" option, just use "Save as…" and it will save the audio separately and, as far as I can tell, without doing any recompression (hence it should be the original aac track).
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