ffmpeg

Commit Graph

Author	SHA1	Message	Date
Nekopanda	f4d5d7e8de	avcodec/mpeg2dec: Fix motion vector rounding for chroma components In 16x8 motion compensation, for lower 16x8 region, the input to mpeg_motion() for motion_y was "motion_y + 16", which causes wrong rounding. For 4:2:0, chroma scaling for y is dividing by two and rounding toward zero. When motion_y < 0 and motion_y + 16 > 0, the rounding direction of "motion_y" and "motion_y + 16" is different and rounding "motion_y + 16" would be incorrect. We should input "motion_y" as is to round correctly. I add "is_16x8" flag to do that. Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>	2018-02-11 12:04:47 +01:00
James Almer	33aa8a6221	avformat/framecrc: enable new output Reviewed-by: Michael Niedermayer <michael@niedermayer.cc> Signed-off-by: James Almer <jamrial@gmail.com>	2016-04-13 11:37:14 -03:00
Christophe Gisquet	2a1158ff3b	fate: yadif: add >8 bit tests Signed-off-by: Michael Niedermayer <michaelni@gmx.at>	2014-06-15 13:13:11 +02:00

Author

SHA1

Message

Date

Nekopanda

f4d5d7e8de

avcodec/mpeg2dec: Fix motion vector rounding for chroma components

In 16x8 motion compensation, for lower 16x8 region, the input to mpeg_motion() for motion_y was "motion_y + 16", which causes wrong rounding. For 4:2:0, chroma scaling for y is dividing by two and rounding toward zero. When motion_y < 0 and motion_y + 16 > 0, the rounding direction of "motion_y" and "motion_y + 16" is different and rounding "motion_y + 16" would be incorrect.

We should input "motion_y" as is to round correctly. I add "is_16x8" flag to do that.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

2018-02-11 12:04:47 +01:00

James Almer

33aa8a6221

avformat/framecrc: enable new output

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: James Almer <jamrial@gmail.com>

2016-04-13 11:37:14 -03:00

Christophe Gisquet

2a1158ff3b

fate: yadif: add >8 bit tests

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

2014-06-15 13:13:11 +02:00

3 Commits