lavfi/hqdn3d: remove timeline flag.

The filter stores some temporal data, which needs to be done with the
passthrough callback system when timeline is enabled. Until then,
timeline support is disabled.
avcodec/intrax8: fix regression with wmv3

This also decreases dependancies between intrax8 and the outside

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avutil/log: dont count&print repeats for empty strings

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