[FFmpeg-trac] #8056(undetermined:new): Convert BMP to YUV420p video color shift, but not PNG

Sat Aug 3 12:35:35 EEST 2019

#8056: Convert BMP to YUV420p video color shift, but not PNG
-------------------------------------+-------------------------------------
             Reporter:  fireattack   |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:

 The color become slightly yellow when converting 24-bit BMP to limited
 range video (YUV420p).

 255,255,255 will become 252,254,252 or similar.

 Not reproducible with pixel-exact png file (also attached).
 Not reproducible with yuvj420p

 How to reproduce:
 {{{
 F:\sync\Personal research\!视频\ffmpeg color bug>ffmpeg -loop 1 -i bmp.bmp
 -vf scale=out_color_matrix=bt709 -color_primaries 1 -co
 lor_trc 1 -colorspace 1 -t 30 -pix_fmt yuv420p -y -report bmp.mp4
 ffmpeg started on 2019-08-03 at 04:33:18
 Report written to "ffmpeg-20190803-043318.log"
 ffmpeg version N-94433-gf60b1211b2 Copyright (c) 2000-2019 the FFmpeg
 developers
   built with gcc 9.1.1 (GCC) 20190716
   configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-
 fontconfig --enable-gnutls --enable-iconv --enable-libass -
 -enable-libdav1d --enable-libbluray --enable-libfreetype --enable-
 libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb
  --enable-libopenjpeg --enable-libopus --enable-libshine --enable-
 libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolam
 e --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264
 --enable-libx265 --enable-libxml2 --enable-libzimg --enabl
 e-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis
 --enable-libvo-amrwbenc --enable-libmysofa --enable-libsp
 eex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf
 --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nven
 c --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
   libavutil      56. 32.100 / 56. 32.100
   libavcodec     58. 55.100 / 58. 55.100
   libavformat    58. 30.100 / 58. 30.100
   libavdevice    58.  9.100 / 58.  9.100
   libavfilter     7. 58.100 /  7. 58.100
   libswscale      5.  6.100 /  5.  6.100
   libswresample   3.  6.100 /  3.  6.100
   libpostproc    55.  6.100 / 55.  6.100
 [bmp_pipe @ 0000000000383100] Stream #0: not enough frames to estimate
 rate; consider increasing probesize
 Input #0, bmp_pipe, from 'bmp.bmp':
   Duration: N/A, bitrate: N/A
     Stream #0:0: Video: bmp, bgr24, 1920x1080, 25 tbr, 25 tbn, 25 tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (bmp (native) -> h264 (libx264))
 Press [q] to stop, [?] for help
 [libx264 @ 0000000000386c40] using cpu capabilities: MMX2 SSE2Fast SSSE3
 SSE4.2 AVX FMA3 BMI2 AVX2
 [libx264 @ 0000000000386c40] profile High, level 4.0, 4:2:0, 8-bit
 [libx264 @ 0000000000386c40] 264 - core 158 r2984 3759fcb - H.264/MPEG-4
 AVC codec - Copyleft 2003-2019 - http://www.videolan.org/
 x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex
 subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 c
 hroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1
 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0
  nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0
 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open
 _gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0
 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0
 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
 Output #0, mp4, to 'bmp.mp4':
   Metadata:
     encoder         : Lavf58.30.100
     Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661),
 yuv420p(bt709), 1920x1080, q=-1--1, 25 fps, 12800 tbn, 25 tbc
     Metadata:
       encoder         : Lavc58.55.100 libx264
     Side data:
       cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
 frame=  750 fps= 75 q=-1.0 Lsize=      64kB time=00:00:29.88 bitrate=
 17.5kbits/s speed=2.98x
 video:54kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 17.723938%
 [libx264 @ 0000000000386c40] frame I:3     Avg QP:12.00  size:   670
 [libx264 @ 0000000000386c40] frame P:189   Avg QP:14.11  size:    77
 [libx264 @ 0000000000386c40] frame B:558   Avg QP:18.33  size:    68
 [libx264 @ 0000000000386c40] consecutive B-frames:  0.8%  0.0%  0.0% 99.2%
 [libx264 @ 0000000000386c40] mb I  I16..4:  2.0% 98.0%  0.0%
 [libx264 @ 0000000000386c40] mb P  I16..4:  0.0%  0.0%  0.0%  P16..4:
 0.0%  0.0%  0.0%  0.0%  0.0%    skip:100.0%
 [libx264 @ 0000000000386c40] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:
 0.0%  0.0%  0.0%  direct: 0.0%  skip:100.0%  L0: 0.0% L1:10
 0.0% BI: 0.0%
 [libx264 @ 0000000000386c40] 8x8 transform intra:97.8%
 [libx264 @ 0000000000386c40] coded y,uvDC,uvAC intra: 0.0% 0.0% 0.0%
 inter: 0.0% 0.0% 0.0%
 [libx264 @ 0000000000386c40] i16 v,h,dc,p:  0% 78% 22%  0%
 [libx264 @ 0000000000386c40] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  0% 67% 33%
 0%  0%  0%  0%  0%  0%
 [libx264 @ 0000000000386c40] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu:  0% 72% 28%
 0%  0%  0%  0%  0%  0%
 [libx264 @ 0000000000386c40] i8c dc,h,v,p: 98%  1%  0%  0%
 [libx264 @ 0000000000386c40] Weighted P-Frames: Y:0.0% UV:0.0%
 [libx264 @ 0000000000386c40] kb/s:14.61
 }}}
 Patches should be submitted to the ffmpeg-devel mailing list and not this
 bug tracker.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/8056>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker