Can't hear audio on mp4 movies on Mavericks

[offtheroad]

On a mac running Mavericks I can't hear the audi to mp4 movies. Quicktime 7 dosen't seem to work. Same movie works fone on Snow Leopard.

[redwudz]

Probably better asked and answered in our Mac Forum. Moving you.

[Ai Haibara]

Use VideoSpec or iMediaHUD to get more information about at least one or two of the videos and post the results here.

You might also consider using a player other than Quicktime, like MPlayerX or VLC.

[Herve]

…should be related to audio codecs (the one into your mp4 is not handeled by your player, eg: ac3 audio in mp4)
Your previous system had some plug-ins to enable readout of your audio contents
but your newest have not , so:
- install some plug-ins like Perian, and continue to use QuickTime Player 7 as reader (Notice: do not use QuickTimeX, it does not use your plug-ins)
- or use another reader like VLC
bye

[offtheroad]

Use VideoSpec or iMediaHUD to get more information about at least one or two of the videos and post the results here.

You might also consider using a player other than Quicktime, like MPlayerX or VLC.

tryed both still can't hear audio ona mp4 video.

[Ai Haibara]

Then, something else is wrong, and this is where the information dump on one or more of the videos might have helped. Do they use AC3 audio, for example?

Are you sure you have your sound output/speakers set up correctly in Mavericks?

[offtheroad]

Yes

[Ai Haibara]

...okay, then, do you have any problems playing multichannel/surround MKV files?

I find it odd that your system would only not play audio for MP4 files, even on players that don't use the system architectures. If you take the exact same files from the Mavericks system to another system, do they play properly? (I'm wondering if the copies on the Mavericks system might be corrupt in some way. Doubtful, but I suppose anything's possible.)