Comment Re:Focus group... (Score 1) 412
Actually, it is possible with some products to get higher quality out of the same or lower bitrate when you're using a better encoder - just because they all output bitstreams that comply with the same spec doesn't mean they are all equal, even when given comparable parameters and the same input. Not knowing what encoders BBC was using, and which they switched to, it's hard to say, but there are certainly better and worse encoders, particularly in MPEG-2 (where there's a long history and lot of variety).
That said, I'd not expect a something as radical as a 50% bitrate reduction to result in better encodes unless the original encoder was the original iDVD - the differences are rarely that extreme.