[FFmpeg-trac] #8664(undetermined:new): Drawbox filter does not display over transparent backgrounds

[FFmpeg]

#8664: Drawbox filter does not display over transparent backgrounds
--------------------------------------+------------------------------------
             Reporter:  ScriptTiger   |                     Type:  defect
               Status:  new           |                 Priority:  critical
            Component:  undetermined  |                  Version:  4.0.4
             Keywords:                |               Blocked By:
             Blocking:                |  Reproduced by developer:  0
Analyzed by developer:  0             |
--------------------------------------+------------------------------------
 This bug is reproducible on all versions later than 3.4.2.

 I have the following complex filtergraph stored in a file
 (filtergraph.txt):

 color=
         00000000:
         1280x720:
         sar=1,
 trim=
         end_frame=1,
 format=
         rgba,
 drawbox=
         0:
         175:
         640:
         375:
         545454:
         15,
 drawbox=
         640:
         175:
         640:
         375:
         545454:
         15,
 drawbox=
         0:
         585:
         345:
         60:
         545454:
         fill,
 drawbox=
         935:
         585:
         345:
         60:
         545454:
         fill,
 drawtext=
         fontsize=70:
         fontcolor=blue:
         text='Test':
         x=490-(text_w/2):
         y=60-(text_h/2),
 drawtext=
         fontsize=70:
         fontcolor=red:
         text='Overlay':
         x=715-(text_w/2):
         y=60-(text_h/2),
 drawtext=
         fontsize=30:
         fontcolor=white:
         text='Subtitle':
         x=640-(text_w/2):
         y=120-(text_h/2),
 drawtext=
         fontsize=31.5:
         fontcolor=green:
         text='Host':
         x=1100-(text_w/2):
         y=620-(text_h/2)
 [overlay]

 I then issue the following command:

 ffmpeg -filter_complex filtergraph.txt -map "[overlay]" overlay.png

 In ffmpeg versions 3.4.2 and earlier the png comes out as expected, with
 some drawboxes and text over a transparent background. However, in
 versions later than 3.4.2 there are absolutely no drawboxes present in the
 resultant png but the drawtext comes out fine.

 The build information for the latest version that DOES NOT have this
 problem is as follows:

 ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers
   built with gcc 7.3.0 (GCC)
   configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-
 bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass
 --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-libtwolame --enable-libvpx --enable-libwavpack
 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2
 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-
 libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa
 --enable-libspeex --enable-libxvid --enable-libmfx --enable-cuda --enable-
 cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth
   libavutil      55. 78.100 / 55. 78.100
   libavcodec     57.107.100 / 57.107.100
   libavformat    57. 83.100 / 57. 83.100
   libavdevice    57. 10.100 / 57. 10.100
   libavfilter     6.107.100 /  6.107.100
   libswscale      4.  8.100 /  4.  8.100
   libswresample   2.  9.100 /  2.  9.100
   libpostproc    54.  7.100 / 54.  7.100
 Hyper fast Audio and Video encoder
 usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options]
 outfile}...

 All other versions after that all experience the same issue.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/8664>
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