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

[FFmpeg]

#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
-------------------------------------+-------------------------------------
Changes (by cehoyos):

 * resolution:  needs_more_info => worksforme


Comment:

 I am sorry: While this ticket is invalid because command line including
 complete, uncut console output is missing and because of the usage of
 `-hide_banner` in a ticket unrelated to this option, there is still enough
 information to test, note that using external resources for small input
 files is not welcome though.
 I tested the following:
 {{{
 $ ffmpeg -i 38143163-8e07b0e8-343f-11e8-8545-96c51e8e21e7.png out.mp4
 ffmpeg version N-90524-ge30a37e Copyright (c) 2000-2018 the FFmpeg
 developers
   built with gcc 6.3.0 (GCC)
   configuration: --enable-gpl
   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 '38143163-8e07b0e8-343f-
 11e8-8545-96c51e8e21e7.png':
   Duration: N/A, bitrate: N/A
     Stream #0:0: Video: png, rgb24(pc), 300x300 [SAR 3779:3779 DAR 1:1],
 25 tbr, 25 tbn, 25 tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (png (native) -> mpeg4 (native))
 Press [q] to stop, [?] for help
 Output #0, mp4, to 'out.mp4':
   Metadata:
     encoder         : Lavf58.10.100
     Stream #0:0: Video: mpeg4 (mp4v / 0x7634706D), yuv420p, 300x300 [SAR
 1:1 DAR 1:1], q=2-31, 200 kb/s, 25 fps, 12800 tbn, 25 tbc
     Metadata:
       encoder         : Lavc58.16.100 mpeg4
     Side data:
       cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
 frame=    1 fps=0.0 q=1.6 Lsize=       2kB time=00:00:00.00
 bitrate=198461.5kbits/s speed=0.000438x
 video:1kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 79.499069%
 }}}
 Input and output file look identical here.

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Ticket URL: <https://trac.ffmpeg.org/ticket/7115#comment:3>
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