am ddc1216d: Merge "MPEG4Extractor: more NULL derefernce fixes in parseChunk" into lmp-mr1-dev

* commit 'ddc1216dcf8f9dc1a1340ed4bc6c6f28f29b1076':
  MPEG4Extractor: more NULL derefernce fixes in parseChunk
  do not use paused postition if it's not available
  Use aligned width and height to compute size.