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Assuming that you are watching video in a web browser, there are several possibilities. A lot of video on the web uses Flash Player for rendering, so make sure you are using the latest version which fixes security issues and performance problems. You may also want to clear your Flash cache as well as your web browser's cache files, especially if you are seeing a lot of hard disk activity when this is happening. You may also want to consider cleaning out all of the Windows temp files and directories as well as defragmenting your hard disk.
On a low-bandwidth connection, you may also encounter issues related to buffering. If the player allows changing the size of the buffer, you may want to enlarge it. It will cause the media stream to pull more content before it tries to play it and when there is an interruption in the stream, it has more time to pull more data before the buffer completely empties.
You should also use Task Manager to see how much of your total RAM is being used and page file usage. If you are using a lot of RAM and the system is paging, it will slow down everything but the most obvious ends up being choppy or distorted multimedia playback. If either of these are the case, you may want to add more RAM or reduce the number of currently running processes. Background process can consume a lot of memory or CPU cycles that interfere with your foreground process.
Please try and check Click on set up>video and audio preferences>uncheck background rendering>click on "used this codec for background rendering>click and choose MPEG2 for best output to disc. Now click on project preferences>click on delete button and then choose delete auxiliary files for all project and then click okay.
If audio is choppy it indicates the processor is "busy" and it is buffering due to some other process using up resources and keeping the machine busy so it cannot stream the audio properly. Possibly check the running processes and see which ones have high cpu usage and turn them off, then try it. It may also be a media player issue - have you tried updating the media player or reinstalling it - sometimes installing a service pack will cause a problem with the actual media player - reinstalling them usually fixes that problem.
when watching online videos they're choppy, but after I download to realplayer and play back they're fine. I just can't watch any movie trailers or any online videos, too choppy and pause, I downloaded speed bit accelerator, but doesn't seem to be helping. what can I do. I have a vista home basic
you shouldn't have installed vista service pack 1
its a known issue with vista service pack 1
if u had vista before and u updated it to sp1...i would suggest you to either do a system restore and uninstall sp1
or install XP back