Fragmented MP4 container
When using Adobe System Incorporated HTTP Dynamic Streaming, fragment duration for all fragments should be between two and four seconds and should be constant across all fragments. The Adobe HTTP Dynamic Streaming specification requires fragments to begin with a keyframe. As a result, if the input F4F fragment duration is a larger value such as five or ten seconds, then the output fragment duration can be only a multiple of these values, resulting in very long output fragments. A smaller input fragment size allows more flexibility in configuring the output fragment size to an optimum duration value.
When creating a F4F package, ensure that you use the latest Adobe packager that has several fixed problems.