UMD Stream Viewer Release Note
Confidential
Copyright 2004 Sony corporation

Release Date:   2005/06/06
Version:        UMD Stream Viewer 1.5 RC4

1       Release Content
-UMD Stream Viewer
-Visual C++ .NET 2003 runtime library
-Release Note

3	Changes in 1.5 RC4
The bug with, narrow bands appearing in the CbCr components within the preview screen, when previewing encoded results has been fixed. This bug only effects previewing, and has no effect on the encoding quality.

4       Limitations
-The subtitle format has been changed. Therefore, any subtite ES files (.uss) or PS files (.mps) generated by versions prior to Composer 1.0 Beta6 can not be played back.
-Files generated by the Composer versions prior to 1.0 Alpha3 can not be played back. This is because the EUI version has changed.
-Composer has adapted to video_full_range flag from 1.0 Beta7, but the Viewer has not adapted.
-Video playback may be delayed relative to Audio playback with PCs with inadequate CPU and disc access performance (The Stream Viewer playback warning "!" may be indicated). 
	Show Every Frame: Off
Video and Audio will be in sync, however, video frames may be dropped and motion reproduction may not be smooth. If a certain limit is exceeded, video completely pauses, and after skipping frames for several seconds will re-commence playback. If the load is even higher, not only video but audio will skip for a few seconds. Under extreme load situations, video and audio will repeat stop and restarting playback.
	Show Every Frame: On
Video frames will not be skipped, and will be displayed in sequential order. Therefore, it may look like it is playing in slow motion. While video is delaying, audio will continue playback and the sync will fall off. When the video and audio sync error becomes large, audio output will become silent.
-Even if the PC has adequate CPU and disc access performance, if the hardware has a video board and an audio board with clocks that are not in sync, the follwing symptoms may occur due to the difference in clock frequency.
	Show Every Frame: Off
In order to maintain audio and video sync, occasionaly a video frame may be dropped or doubled.
	Show Every Frame: On
For a long sequence, video and audio sync error will gradually accumulate.

-Under a non-SDI display envirionment (a standard PC), if a window with the same color as the subtitle background is overlayed on the Viewer sceen, video can be seen through the window.
-Simultaneous UMD Stream Composer startup is not prohibited. The software that is started later will show an error dialog "Direct Draw Surface can not be obtained" and terminate.

5       Known Bugs
-Under the SDI display environment with RealVision SD-10, stopping UMD Stream Viewer playback will not lower the CPU load.
-Under the SDI display environment with RealVision SD-10, if Video and Subtitles streams are both set to a 4:3 display aspect ratio and displayed with Pixel Aspect Ratio(NTSC), the screen side regions (black) may not be re-rendered correctly.

-End of document-
