This element defines how often to generate and save keyframes in an FLV file.

The initial value is 60000, which is the recommended value. However, if this tag is unspecified or set to a value out of range, the server uses a default value of 1000. Setting this element to a higher value than the initial value reduces the number of keyframes added to the FLV file and thus reduces the file size. Setting a higher value for the interval, however, reduces the seeking accuracy. The value of this element is defined in milliseconds.

For example, a 15-second video with a file size of 76 KB is increased only to 89 KB when the KeyFrameInterval element is set to 5000, which is an increase of 13 KB, or 17%. The same video has a size of 109 KB with the KeyFrameInterval element set to 1000, which is an increase of 33 KB, or 43%.

Example

<KeyFrameInterval>1000</KeyFrameInterval>

See also

StorageDir, DuplicateDir, CacheUpdateInterval