How do I convert mp4 with 5.1-channel AAC audio to 2-channel stereo

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Wednesday 25.11.2009 / 13:02

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How do I convert mp4 with 5.1-channel AAC audio to 2-channel stereo

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LiLBrotha

Newbie

29. March 2009 @ 16:11

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I've got an h264 mp4 file that I want to be able to either play from a usb stick or stream to my Xbox 360. The file plays fine on my computer but if I try to play it on the 360 I'm told the format is not supported and get the following error code 69-C00D119A.

I think this is because the file contains 5.1 audio and the 360 does not support this for mp4. Does anyone know how to convert the 5.1 audio to a 2-channel stereo source?

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attar

AfterDawn Addict

29. March 2009 @ 19:14

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Try AviDemux.
Drag the file onto the window.
Set the side menu as shown then click the 'Save' logo.
give the file a new name (include the extension) e.g. newfile.mp4

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LiLBrotha

Newbie

31. March 2009 @ 18:58

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Using this method works but the audio always falls out of sync with the video.

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MajTJKong

Newbie

22. July 2009 @ 03:10

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I also had sync issues when using avidemux as outlined above for mp4 with 5.1-channel AAC audio to 2-ch

This method has worked for me numerous times now:

(1) Demux (extract) the audio stream with Yamb, (2) transcode the 5.1 AAC stream to 2 ch with MediaCoder Audio Edition, and (3) mux the 2ch AAC back into the MP4 w/ the H264 stream with Yamb. Since it only involves reencoding (transcoding) the audio, it doesn't take very long and the video quality will be unaffected

Yamb: http://www.afterdawn.com/software/video_..._tools/yamb.cfm
Mediacoder Audio Edition: http://mediacoder.sourceforge.net/audio/

(1) Demux audio w/ Yamb:

(2) Transcode 6ch AAC to 2ch w/ mediacoder:

Note: Before being able to transcode 5.1 ch AAC to 2 ch you will have to find & paste a enc_aacplus.dll and nscrt.dll to the Mediacoder codecs folder (C:\Program Files\MediaCoder Audio Edition\codecs). If you have WinAmp installed you can find them in its installation folder or if you don't have WinAmp you can probably find them by doing a web search for "enc_aacplus.dll".
http://www.google.com/search?q=enc_aacplus.dll
I found them linked in another vid forum comments at the first search result for me.

Also, the first time you try to run mediacoder it will open a webpage. You can just check the 'do not open next time mediacoder starts' box and then click 'open mediacoder' instead of doing the online setup.

(3) Mux 2ch & vid stream w/ Yamb:

;)

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This message has been edited since posting. Last time this message was edited on 22. July 2009 @ 03:22

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