libxvid: guess a good aspect when we cant store the exact one.

Based on 394781a8.
avcodec/proresdec2: return meaningful error codes

Signed-off-by: Paul B Mahol <onemda@gmail.com>
Merge remote-tracking branch 'cehoyos/master'

* cehoyos/master:
  libxvid: guess a good aspect when we cant store the exact one.

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