Here are the specific details on video playback formats for the December update:<BR><BR><I>What exactly does the Xbox 360 support for AVI?<BR><BR>Xbox 360 supports the following for AVI:<BR><BR><UL TYPE=SQUARE><LI> File Extensions: .avi, .divx<BR><LI> Containers: AVI<BR><LI> Video Profiles: MPEG-4 Part 2, Simple & Advanced Simple Profile<BR><LI> Video Bitrate: 5 Mbps with resolutions of 1280 x 720 at 30fps. See question number 11 for more information.<BR><LI> Audio Profiles: Dolby® Digital 2 channel and 5.1 channel, MP3<BR><LI> Audio Max Bitrate: No restrictions. See question number 11 for more information.</UL><BR><BR>What exactly does the Xbox 360 support for H.264?<BR><BR>Xbox 360 supports the following for H.264:<BR><BR><UL TYPE=SQUARE><LI> File Extensions: .mp4, .m4v, mp4v, .mov<BR><LI> Containers: MPEG-4, QuickTime<BR><LI> Video Profiles: Baseline, main, and high (up to Level 4.1) profiles.<BR><LI> Video Bitrate: 10 Mbps with resolutions of 1920 x 1080 at 30fps. See question number 11 for more information.<BR><LI> Audio Profiles: 2 channel AAC low complexity (LC)<BR><LI> Audio Max Bitrate: No restrictions. See question number 11 for more information.</UL><BR><BR>What exactly does the Xbox 360 support for MPEG-4 Part 2?<BR><BR>Xbox 360 supports the following for MPEG-4:<BR><BR><UL TYPE=SQUARE><LI> File Extensions: .mp4, .m4v, .mp4v, .mov<BR><LI> Containers: MPEG-4, QuickTime<BR><LI> Video Profiles: Simple & **Advanced Simple Profile<BR><LI> Video Bitrate: 5 Mbps with resolutions of 1280 x 720 at 30fps. See question number 11 for more information.<BR><LI> Audio Profiles: 2 channel AAC low complexity (LC)<BR><LI> Audio Max Bitrate: No restrictions. See question number 11 for more information.</UL><BR><BR>What exactly does the Xbox 360 support for WMV (VC-1)?<BR><BR>Xbox 360 supports the following for WMV:<BR><BR><UL TYPE=SQUARE><LI> File Extensions: .wmv<BR><LI> Container: asf<BR><LI> Video Profiles: WMV7 (WMV1), WMV8 (WMV2), WMV9 (WMV3), VC-1 (WVC1 or WMVA) in simple, main, and advanced up to Level 3<BR><LI> Video Bitrate: 15 Mbps with resolutions of 1920 x 1080 at 30fps. See question number 11 for more information.<BR><LI> Audio Profiles: WMA7/8, WMA 9 Pro (stereo and 5.1), WMA lossless<BR><LI> Audio Max Bitrate: No restrictions. See question number 11 for more information.</UL><BR><BR><BR>Can I mix and match the video and audio codecs outside of those defined in questions 1 through 4 above?<BR><BR>No you cannot. We only support each audio and video codec in the explicit containers defined in questions 1 through 4.</I><BR><BR>MUCH more info at<BR>http://blogs.msdn.com/xboxteam/ http://blogs.msdn.com/xboxteam/