Got an Audio or Video Question? I've answered hundreds of them and compiled the most popular questions in a downloadable searchable 200-page collection of answers. From finding the right codecs to play your movies, to converting files to new formats, this guide steps you through solutions to dozens of audio and video problems. Think of this as the ultimate painkiller for your personal digital video and audio headaches. 
"When I play AVI movies in Windows Media Player they are upside down. They play fine in Real, but play with the video upside down in Media Player. How can I fix this upside down problem?"
Video playing upside down is almost always a codec problem. Windows Media Player attempts to find the best codec on your system for playing back a particular type of video, but sometimes it either uses the wrong one or uses a codec with unpredictable results (like playing your video inverted). Fixing this will also fix video playing black and white and is related to needing to fix video with no audio playback problems. Almost every case of video playing upside down is related to video requiring the DivX or XviD codec. Sometimes you may have a correct version installed and it gets overwritten by installing another app. Both DivX and XviD codecs are free, although DivX.com will encourage you to buy the DivX Pro upgrade, which includes some video converting tools and a few additional features. Download the free DivX codec, which also includes an automatic update check, which helps prevent this problem in the future.
To verify that DivX or XviD are actually the cause, you can use an app called MediaInfo to determine which codec you need.
