Copied from the Media Center 20.0.20 thread, where discussion is not allowed.
Media Network wont stream audio with the video (streaming TV shows to PS3). This only happens in MC20 and since the 20.0.17 build. Video still streams fine just no audio is even received by the PS3 console.
Are those your DLNA settings for the PS3 still? Because it doesn't look like the PS3 supports H.264 video with LPCM audio. I assume you are outputting LPCM with video, since you are with audio. See
Movie & video file types for PS3.
Regardless, check the DLNA video settings for the PS3, since the defaults may have changed in MC20.0.20. Also check the MC Audio Path while playing a video, and see what it says it is outputting.
But I'm no expert on formats, and I don't have a PS3 to test with. However, if the above are your PS3 DLNA settings still, I would be changing the audio format to AAC and see if that fixes the problem. If yes, then experiment with the best video and audio the PS3 will accept.