Blu-ray's share of movie/TV disc revenue declined to its lowest level in months in the final week of May — even with a couple of blockbuster titles in the mix, the second installment of "True Blood" and "Avatar."

The 1080p format's portion of video-disc revenues sunk to 10 percent for the week ending May 30.

Meanwhile, standard DVD's revenue in the same period at 90 percent of $128 million, nevertheless, is down 13 percent over a year ago. Blu-ray's $14.4 million was actually up nearly 2.5 percent over late May 2009, according to Home Media Research.

Combined Blu-ray DVD titles sales for the same week were $142.36 million — down about 11.7 percent over a year ago.