producer_avformat.c: - remove seeking immediately after opening file improves compatibility   (in particular, ogg theora) - use non-deprecated avcodec_decode_audio2 if available - changes to adhere to warnings on ffmpeg decode api docs ought to improve   stability and compatibility
producer_avformat.c:
- remove seeking immediately after opening file improves compatibility
  (in particular, ogg theora)
- use non-deprecated avcodec_decode_audio2 if available
- changes to adhere to warnings on ffmpeg decode api docs ought to improve
  stability and compatibility


git-svn-id: 5ee9a2a761147e4d9fa32565ef7949b666b061d3@981 d19143bc-622f-0410-bfdd-b5b2a6649095

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