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No Sound MacBook Pro MP4

Posted on 2013-11-15
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Last Modified: 2013-11-16
Just picked up a MackBook Pro this afternoon. None of the MP4 video files I have created previously have sound. Downloaded them to the desktop and video plays but no sound. Mute is NOT on.
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Question by:xmouser
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by:Gregory Miller
ID: 39652715
I have to ask the obvious question because you did not specify... Do you get sound from any application? If yes, then you need to install the necessary CODEC that was used to encode the audio in the MP4 files you have. If NO, well you must solve this first. Check the port where the speakers are plugged into if using external speakers that is.
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by:xmouser
ID: 39653068
Yes getting sound from everything except imported video files that work fine on the PC.
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by:xmouser
ID: 39653069
Internal speakers only.
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Gregory Miller earned 500 total points
ID: 39653192
definitely a CODEC issue. You will need to figure out the CODEC that was used to encode the MP4 audio streams and see if there is a CODEC available for Mac OS.

I am reading that VLC may may already be installed on the Mac and will work directly.
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Author Comment

by:xmouser
ID: 39653204
Other MP4s work fine the only ones that are givinge me issues are ones previously edited.
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Expert Comment

by:Gregory Miller
ID: 39653210
The software used to edit the file is where the issue comes from. Any program that creates an audio or video stream for playback has to be encoded with a CODEC. There are dozens, if not hundreds of different CODECs in the wild. The same CODEC must be used to decode the stream during playback. Whatever CODEC was used to encode the file you have MUST be used to DECODE the file. There is really no other option.

Did you try the VLC program? What program did you use to edit the files on the PC?
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Author Comment

by:xmouser
ID: 39653217
Yes, VLC is playing correctly - I'm happy with that.
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by:Gregory Miller
ID: 39653221
Cool...
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