Almost all my files are MKV or else MP4 with AC3. :) Not sure how Guy_K wants the file but if you can upload to a public sharing site (megaupload?) I wouldn’t mind trying it out on my setup. Make sure to double-check the sample and make sure it’s long enough to exhibit the issue. No experience with My MP4Box GUI but apparently it works really well and gets a high rating.

I’ve used YAMB and gotten along well with it but have seen some critical comments regarding it’s stability (including a worrying tale of it trashing the start menu on uninstall!). Try using YAMB or My MP4Box GUI to split an MP4. Yeah, it’s usually the case that the most active members are the ones with the biggest issues and therefore are the most negative. To me, this shows that the WD firmware had at one point the capability to play these MP4’s just fine, but somehow the audio sync programming in later firmware updates that came after fw 1.0 became broken. Sorry the thread started off with a bunch of negativity, but I’m glad and can’t say that I’m not happy that it’s become really productive now. Can you or anyone else recommend a program to me that can split up a movie file into smaller segments? Thanks. To Guy_K: I have a bunch of mp4’s that don’t play correctly, but they’re all really huge full length movie files, but I’m super eager to get sample files submitted to you so that you guys can take a look at it. To PixelPower: I will run mediainfo and post data later this evening. Not to mention these same MP4’s also play just fine on any computer. But the fact remains that the 1.0 firmware works flawlessly as far as audio syncing is concerned. I’m no tech guru, but I would assume that the h264 container is a standard that all encoders would adhere to, but obviously this isn’t the case judging from your test results. To the guys that suspect that it is a problem with the MP4’s themselves and not a problem that exists in the WDTV Live: it’s a good suggestion, and I found it interesting that somehow an MP4 produced in Handbrake would have audio sync issues whereas MP4’s encoded with other software did not. Glad to see many of you on the same boat as me and putting in the effort to do debugging to narrow the problem down.

Avidemux audio out of sync