- You are running Windows 8 or 8.1.
- You use the Video app (Xbox Video) in Windows 8 to play a video that is on your computer.
- The encoded video format is not supported by the graphics hardware decoder and software decoding is used instead.
In this scenario, during playback you may encounter video stuttering or dropped frames. The same video may play without any issues when using Windows Media Player.
- In Windows 8, use the keyboard shortcut of Windows Key+X to bring up the quick link menu and select Control Panel.
- In the Search pane, type in "Power" without the quotes.
- From the search results, click on "Edit power plan".
- Clink on "Change advanced power settings".
- From the list of advanced settings, find and click on the one named "Processor power management".
- Open the "Maximum processor state, where the maximum processor state setting can be changed for battery or while plugged in. As an example, you could change the value while plugged in to 100%.
The MPEG4 Part 2 format is one format known to not be supported for hardware decoding by various video card vendors. When the software decoder is used, video is displayed in I-Frame only mode. The low 'I-Frame only mode' frame rate for MPEG4 Part 2 content is due to the overly aggressive handling of quality messages (QM). It takes only 4-5 frames to be late to get in to I-Frame only mode and it takes 4-5 I-Frames to get out of this mode. Microsoft is reviewing the aggressiveness applied in this situation.