protect against misordered frames
protect against misordered frames

when the frames are out of order it is possible that aligned last_offset
will be smaller than the frame start offset. if that happens just read the
full cache size

kaltura/nginx-vod-module,kaltura/nginx-vod-module,kaltura/nginx-vod-module,kaltura/nginx-vod-module,kaltura/nginx-vod-module,kaltura/nginx-vod-module