Changes 18/3/2014.

Changelog:
2014.03.18:
- Fixed a bug in "H264VideoFileServerMediaSubsession" (and "H265VideoFileServerMediaSubsession"
  and "MPEG4VideoFileServerMediaSubsession") that could cause a crash (due to a 'race condition')
  if the input file ended before 'configuration' data could be extracted.
  (Thanks to Robert Sujker for finding and analyzing this problem.)