[mythtv-users] Video and Audio quality settings

[Brian Wood]

On May 16, 2006, at 5:15 PM, Chris Moewes-Bystrom wrote:

> A while ago, there was a posting that referred to a graph that
> demonstrated the different picture qualities at different recording
> sizes and bitrates. Specifically it showed that over a certain
> bitrate, there wasn't any additional quality improvement you just got
> a bigger file. Using that chart I adjusted my recording values and saw
> an improvement in the image.
>
> Now I am looking for some advice for sound. I have increased my sample
> rate, and decrease my bitrate with little notable difference. Figuring
> that more samples were better, but that I could lower the bitrate
> since it was above cd quality anyways.
>
> Anyone ever seen an analysis of sound quality at different sample  
> and bit rates?

This may be close to what you are looking for:

http://www.iis.fraunhofer.de/amm/techinf/layer3/

The original chart of video bitrates that you referred to is:

http://www.mediachance.com/dvdlab/tutorial/bitrate.html

Obviously googling for "mpeg audio bitrate" will find you a lot more.