NOTE: I meant "AAC" and not "AC3" in the title

So this is really puzzling. I got the WD TV last Friday and everything worked fine. I had several MP4 videos (h.264 + AAC sound...5.1 I believe) and they worked beautifully.

Fast forward to the next day and I disconnected everything and hooked it back up proper (since I had temporarily hooked it up Friday just to test it out). I go to play a video and there's no sound...but my receiver shows it's receiving a Dolby Digital signal.

On a hunch I switched the audio output from "digital" to "stereo" and play a video. Now there's sound but the receiver is now saying "Dolby Pro Logic II" (since it's 2-ch I'm assuming).

I can play an AVI file in "digital" output mode and the sound works fine. I'm just having trouble playing any MP4 video with 5.1 Dolby Digital now. I've unplugged the unit, reset it, upgraded the firmware (1.02.06 I believe). Any ideas?

The audio stream of that file is very likely not Dolby Digital (which should work with no problem whatsoever), but something else, e.g. AAC.

Download MediaInfo from here: http://mediainfo.sourceforge.net

install it, load the video file that causes you headache and post your results.

So Mediainfo reports that all of the files are using AAC audio. Shouldn't AAC audio work when used in an MP4 (or M4v) container?

I just encoded a movie in an MKV container using h.264 and AC3 audio...works fine.

I then encoded the same with using an MP4 container using h.264 and AC3..audio "unsupported".

So something with MP4 containers is screwy here. The other funny thing is that when I play the MP4 movies (other than the one I just mentioned) it still says "Audio Channel 1 (digital)" and my receiver says it's receiving a Dolby Digital signal.

Multi-channel AAC decoding is not supported. To hear the sound, you need to set the audio output to stereo in the WD TV-HD settings (-> downmixed to stereo).

stereo AAC inside MKV is also is out of sync.. :/

hhUmmhUMMMR Southpark!! ;)

That depends on your equipment, too. I have no sync issues whatsoever, but I send both audio and video signals via HDMI to my receiver, and from there to the TV. The receiver makes sure that everything is in sync.

so my equipment makes DTS, Dolby and stereo if any other format sync?

and makes the stereo AAC out of sync....?

well, that makes sense.....


its not a fix, if YOU have a receiver that syncs video and audio.. :/

So I must've been in a daze the first night I set this up then. I could've sworn all of my MP4 files with AAC audio were working fine.

I've tested some MKV's with AC3 and they work and from what I've read it sounds like MKV makes the most to encode in. Maybe I'll go that route.