I had this as a problem also. what you need to do is change how RR controls the volume. I think default is is set to control all, you want it to only control the master volume or wave output. I am at work now and cant tell you exactly how it is, but that is the jist of what I did.
Tried all three, Master, All, Wave, still no joy.
Going into AC3Filter and raising the gain to about 16 works but sounds awful. Also made sure it is set to 2 speaker/stereo output.
I have now tried this in the car. I changed the master gain in AC3Filter to 11. I left all the other gains to "0", now video actually seems to be a louder then music. I also set RR volume control to Master Volume.
I kinda have the same problem but on my situation only the rear speakers have sound and no sound at all in the front speakers during movie/dvd playback, but all speakers works when using for music.
Are you using a headunit? If so it sounds like you have front going to the back, back to the front. In MPC and in AC3Filter you can adjust the output to 2/0 - Stereo. Which takes the 5.1 input and changes it to 2 speaker stereo. In AC3Filter you can also change the gains per speaker. You could move it down for the rears and up for the front.
No, Im not using a headunit. so the AC3Filter can still fix this?
don't know, but it's worth a try isn't?
All I did was get rid of media player classic and the ini's (moved them to a temp location just in case) and then downloaded Media Player 11. After it installed, I went thru and changed all the settings to the highest volume (sound device, etc.). I rebooted the machine just to be safe and then played my test file, Aerosmiths Sweet Emotion mpg and the movie Fast and The Furious avi, and both played. Previously both played outside of Road Runner correctly but only F&F played within RR but couldn't hear the volume. When I got inside RR, the F&F played perfectly at the same level as my mp3's...PERFECT! NOW the weird thing. For some reason, it can play the Sweet Emotion video (.mpg) perfectly outside of RR but when I try it inside, it continually skips over it like it doesn't;t know how to decode it. In fact, there are 4 or 5 .mpg's that it skips over but plays perfect outside of RR. I have no clue why but at least I am making head way.
Hopefully we can get this stuff worked out together. Thanks.