A new Sony Ericsson Xperia X10 720p video sample has leaked onto YouTube from a Japanese owner. YouTube member tenchansan10 was at the Motorsport Japan 2010 event and shot some impressive footage of an x-treme trial rider. The first sample we saw suffered from noticeable frame rate issues. These haven’t disappeared entirely, but the new video is perfectly watchable, especially considering the fast action. The video is embedded in 720p quality below (click full screen to get a true sense of the quality).