Contact your webhost to set the PHP Configuration same as below.

* safe_mode = off
* register_globals = off
* open_basedir = (no value)
* output_buffering = on
* upload_max_filesize = 200M (or more)
* post_max_size = 200M (or more)
* max_execution_time = 6000 (or more)
* max_input_time = 6000 (or more)
* memory_limit = 128M (or more)
* display_errors = On
* file_uploads = On
* session.gc_maxlifetime = 14000 (or more)

After resetting upload a test video and check its working or not