Macbook Pro does not play audio part of video

Hi,
I have a Macbook Pro (early 2013 with OS 10.10.1).
A colleague sent me a video file, which was originally recorded in MTS format. The sound portion of it does not play on my machine, although it generally can handle MTS. I have a colleague with a Windows PC, for him the audio plays ok. I have another colleague with an older MBP, for him the audio also plays ok. But then I have two more colleagues with a newer MBP like me, and for none of us the audio plays at all. The strange thing is that I can open the file in various editors such as Premiere, Audition, or Logic Pro, and they would all show the waveform of the audio, even the VU meters react normally, but there still is no audible sound.
On the machines that play the sound, we have tried converting the video and exporting the audio portion into various other formats, but with the very same result. None of them play sound for me. This is extremely weird and we have no answer what could be the problem.
Any help would be very much appreciated.
Thanks a lot & best regards,
Rainer

Hi Eric,
thanks for the reply.
As I said, we had tried several editors and players, as well as all kinds of formats, using all kinds of converters, but so far to no avail.
The AAC codec is a common codec for the Mac, so there should be no need to convert it. I have videos with that codec that play ok. It already turned out that converting the video file to other formats does not make any difference.
But thanks anyway,
Rainer

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Macbook Pro does not play audio part of video

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