FLV stands for "Flash Video" and it is a digital video codec that is used by some video files. This video codec has proven to be robust and well-coded. However, even it can suffer from caching issues. Cache is a term used to refer to the memory set aside to buffer the video stream. If this cache is too small, then the video can freeze up because there is not another frame in the buffer.
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The leading cause of video freezing from cache issues is that the cache size has been set too small in your FLV player. This can be easily rectified by going into "File" and then "Preferences" . The exact location of the cache slider will depend on the video player that you are using but they all operate by sliding the arrow further to the right. Alternatively you can manually enter the cache size in the text box.
Other software running on your computer can eat into the space reserved for your video player's cache if they have higher priority. For example any Microsoft product will take the RAM designated for your cache and any hardware drivers can also muscle the video player out. Exiting out of any other software and updating your drivers can fix this problem.
You simply may not have enough RAM memory and your computer is being forced to use "virtual memory". Virtual memory is when your computer uses hard drive space to act as a form of very slow RAM. If you are watching a high definition video file, then the virtual memory can quickly become overwhelmed. Upgrading your RAM can help alleviate this bottleneck.
Electronics are able to function faster the colder they are. Inversely they perform worse when they are hot, which can happen to your RAM where the cache is stored. Your RAM has a speed just like your processor and the hotter it gets, the slower it performs. Moving your computer away from any heat sources or just shutting it off and letting it cool down can help with freezing video.
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