Originally Posted by JDLIVE
One issue I've seen from Gotham is volume levels, they seem to be all over the place, i.e. recorded TV shows are much softer than live TV, different TV channels have huge differences in loudness. Don't recall having this issue in Frodo, though I also added a soundbar to the setup before upgrading to Gotham.
I've always noticed a difference amongst live tv channels and their broadcast volumes in WMC, XBMC, etc. The FCC had introduced some regulation recently saying broadcasters were no longer allowed to alter the volume of their commercials more than +/- some arbitrary number from the main programming. Afterwards, it seems like I have started noticing broadcasters taking each commercial to the full (-) end of the range then back to the full (+) of the range (and continually swapping through each commercial)
Movies and music are all expected volumes. Only tv does this for me
Originally Posted by brickie
Good to know for the future!! Another question..Upgraded to Gotham and I'm really liking this. My question is though, has anybody else notice what seems to me to be a MUCH improved picture and sound quality from Gotham? It's always been good, but it just really seems like things are noticeably better in those areas..
I watch a lot of 1080 on a 1080 display, so I've always thought PQ was good. My cable package is 1080i and 720p and those look the same to me still
For SD, there are HQ scalers available in the Video Settings (on-screen display option) to play around with. I can see some improvement changing the scaler from bilinear or nearest neighbor to lanczos3 optimized, especially during fast-motion scenes. I don't have a ton of SD content to play with though
For audio, the audio engine code was rewritten. I don't know how much difference it makes, but here is the blurb from the wiki
ActiveAE was a large rewrite of SoftAE and combined all platforms to one engine. Sinks are available for all platforms. ActiveAE uses an active state machine pattern, with a separate high priority sink thread, that cares for underruns. ActiveAE is completely build upon ffmpeg, which is used for resampling, channel mapping and decoding. High performance SSE algorithms - already existent in the AEUtils - were fixed up and are used to do the final conversion into formats the sinks can accept. ActiveAE uses the float format internally and it is working bit-exact.
A new feature is the upmix via AC3 transcoding support. On optical devices where only 2 pcm channels are available, we can now upmix to 5.1 by transcoding to ac3. Another new feature is the PulseAudio sink for ActiveAE, which was merged into XBMC mainline on January 9th 2014 and enables Linux desktop users to use the PulseAudio system instead of ALSA, which was an often requested feature. See PulseAudio
ActiveAE has three build-in profiles: Best Match, Optimized and Fixed.
Fixed takes care that all audio you will play is play in the very same data format. Your receiver does not need to switch modes.
Best Match is what previously existed as the "audiophile" mode. Whenever a new video or music playback starts, the audio engine will select the best sink for that stream.
Optimized is something special, as it tries to reduce the reopening of sinks a lot. One example is live-TV where it switches between 5.1 to 2.0 during commercials. In order to not open the device anew and loosing some (milliseconds of) audio, the 2.0 commercials are played with the already open 5.1 sink by muting the non existent channels.