dcadec: Decode LFE to avoid adding random data when downmixing with LFE

Signed-off-by: Tim Walker <tdskywalker@gmail.com>
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
Merge remote-tracking branch 'qatar/master'

* qatar/master:
  dcadec: Decode LFE to avoid adding random data when downmixing with LFE

See: 6e7de1144436a6871fdbd7859f3a2ece6e89d9fb
Merged-by: Michael Niedermayer <michaelni@gmx.at>
avformat/utils: remove unused variable

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avutil/opt: factor set_string_image_size() out

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avutil/opt: factor set_string_video_rate() out

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avutil/opt: factor set_string_color() out

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avutil/opt: Implement av_opt_set_defaults* in O(N) instead of O(N²) time

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