[FFmpeg-trac] #7115(undetermined:closed): Image BECOMES darker unexpectedly

FFmpeg trac at avcodec.org
Sat Mar 31 12:55:16 EEST 2018

#7115: Image BECOMES darker unexpectedly
             Reporter:  testh001     |                    Owner:
                 Type:  defect       |                   Status:  closed
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:               |               Resolution:
             Blocking:               |  worksforme
Analyzed by developer:  0            |               Blocked By:
                                     |  Reproduced by developer:  0

Comment (by testh001):


 Thanks for the response. I was thinking that you had closed this because
 it is working as intended, but since you have said that the input and
 output is looking same for you, I suppose what I am experiencing is
 actually a bug.

 Sorry for missing full output, I didn't know it is required, and sorry for
 `-hide_banner` command, I didn't know it is  prohibited. I think the
 easiest way to demonstrate the issue is to attach screen recording. But I
 hadn't find a way to attach large videos in the ticket, so I made a video
 and posted to youtube, please take a look, I demonstrated the issue there:

 To make this issue valid, as you said, I am attaching full output
 (including copyright banner):


 ffmpeg version N-90535-gcdd6a525e4 Copyright (c) 2000-2018 the FFmpeg

   built with gcc 7.3.0 (GCC)
   configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-
 bzlib --e
 nable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-
 ay --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb
 libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine
 le-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame
 bvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-
 libx265 --en
 able-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp
 libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa
 e-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf
 e-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec
 le-dxva2 --enable-avisynth
   libavutil      56. 12.100 / 56. 12.100
   libavcodec     58. 16.100 / 58. 16.100
   libavformat    58. 10.100 / 58. 10.100
   libavdevice    58.  2.100 / 58.  2.100
   libavfilter     7. 13.100 /  7. 13.100
   libswscale      5.  0.102 /  5.  0.102
   libswresample   3.  0.101 /  3.  0.101
   libpostproc    55.  0.100 / 55.  0.100
 Input #0, png_pipe, from '1.png':
   Duration: N/A, bitrate: N/A
     Stream #0:0: Video: png, rgb24(pc), 1920x1080 [SAR 3779:3779 DAR
 16:9], 25 t
 br, 25 tbn, 25 tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (png (native) -> h264 (libx264))
 Press [q] to stop, [?] for help
 [libx264 @ 000000592af5d580] using SAR=1/1
 [libx264 @ 000000592af5d580] using cpu capabilities: MMX2 SSE2Fast LZCNT
 [libx264 @ 000000592af5d580] profile High 4:4:4 Predictive, level 4.0,
 4:4:4 8-b
 [libx264 @ 000000592af5d580] 264 - core 155 r2901 7d0ff22 - H.264/MPEG-4
 AVC cod
 ec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options:
 cabac=1 r
 ef=3 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=7 psy=1 psy_rd=1.00:0.00
 _ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11
 p=1 chroma_qp_offset=4 threads=3 lookahead_threads=1 sliced_threads=0 nr=0
 ate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3
 b_pyramid=2 b_a
 dapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250
  scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0
  qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
 Output #0, mp4, to '1.mp4':
     encoder         : Lavf58.10.100
     Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv444p,
 1920x1080 [
 SAR 1:1 DAR 16:9], q=-1--1, 25 fps, 12800 tbn, 25 tbc
       encoder         : Lavc58.16.100 libx264
     Side data:
       cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
 frame=    1 fps=0.0 q=28.0 Lsize=       2kB time=00:00:00.00
 ts/s speed=0.000999x
 video:1kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing ove
 rhead: 68.196999%
 [libx264 @ 000000592af5d580] frame I:1     Avg QP:13.00  size:   510
 [libx264 @ 000000592af5d580] mb I  I16..4: 100.0%  0.0%  0.0%
 [libx264 @ 000000592af5d580] coded y,u,v intra: 0.0% 0.0% 0.0%
 [libx264 @ 000000592af5d580] i16 v,h,dc,p: 99%  0%  1%  0%
 [libx264 @ 000000592af5d580] kb/s:102.00


 Please take a look at the screen recording I posted and please tell me if
 I am doing anything wrong or is this a bug? And in case of the latter,
 please reopen the issue, if possible.

 Thanks :)

Ticket URL: <https://trac.ffmpeg.org/ticket/7115#comment:4>
FFmpeg <https://ffmpeg.org>
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