lavc/dirac_arith: Only compile x86 asm if ARCH_X86 is set.

Fixes ticket #3544.
Also print GUIDs as shown in the Windows registry to ease debugging.
lavf/qcp: Print unknown GUID on error.
apng: move shared header from avformat to avcodec.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avformat/apngdec: exit probing when skipping is not possible.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/ppc/lossless_audiodsp_altivec: POWER LE support for scalarproduct_and_madd_int16_altivec()

adds macro GET_T()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avfilter/vf_tinterlace: Favor using standard timebases for the output

Reported-by: Vittorio Giovara <vittorio.giovara@gmail.com>
Inspired by discussion with Kieran Kunhya <kierank@obe.tv>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Revert "avfilter/vf_interlace: more accurate pts calculation"

This reverts commit df8248f66e362c3015d95ac86d1917dde8dc0a0c.

the revert produces a timebase and timestamps that are more close
to what users expect

Hoped-by: koda