h263dec: call get_format after setting resolution and profile

Bug-Id: 541
Merge commit '1f29e5d7a2b0950f3b6820896e97e2c02e6a10a9'

* commit '1f29e5d7a2b0950f3b6820896e97e2c02e6a10a9':
  h263dec: call get_format after setting resolution and profile

Merged-by: Michael Niedermayer <michaelni@gmx.at>
avformat/utils: print more information with av_dlog() in compute_pkt_fields()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>