Troubleshooting Video Playback
When you play a video on a portable computer, the video may play slower than the video camera's capabilities. Additionally, the preview video may be garbled, jerky, and inconsistent in its motion or stopped suddenly without any clear reason.
This behaviour may occur due to following reasons:
- Power management affect laptop video playback performance. For example, some power-management technologies used by modern portable computers, such as Intel's SpeedStep technology and AMD's PowerNow! Technology permit the processor to run at reduced core voltages and clock frequencies. When you change the processor performance state, access to system memory is temporarily blocked. As a result, streaming devices dependent on accessing memory may be starved for data, resulting in glitches or drop-outs in playback.
- When you run a mobile processor in a reduced-performance mode, this may not provide enough processing power to properly render a video stream.
- When the processor performance mode changes dynamically, it may interfere with video playback.
- Switching your system power source from alternating current (AC) to battery power.
- Other system activity may also affect video playback. Video playback performance is very CPU intensive. As a result, if you run other applications while attempting to view video on your laptop, you might significantly degrade the playback performance.
To resolve the video playback issues in portable computers, use the following guidelines.
- When video or audio playback is in progress, do not switch the portable computer from AC power to battery power.
- Use the applet or configuration utility provided by your system vendor to select a setting that does not allow the processor speed to change. If video playback performance is compromised by running a processor at a low speed, select the highest speed available. See your system manufacturer's documentation for details about changing these settings.
- For Windows XP, ensure that you've set the power scheme to "Always On" by performing the following steps:
- Start the Control Panel Power Options applet (go to Start-> Settings-> Control Panel, and click Power Options).
- Select the Power Schemes tab.
- Select Always On from the drop-down list.
- Click OK.
Note: After you finish viewing your video, it is better to adjust the power mode or processor mode to a lower setting to preserve battery life.