[FFmpeg-trac] #7941(undetermined:reopened): Transparency broken when encoding animated webp

[FFmpeg]

#7941: Transparency broken when encoding animated webp
-------------------------------------+-------------------------------------
             Reporter:  nireldidi    |                    Owner:  nireldidi
                 Type:  defect       |                   Status:  reopened
             Priority:  important    |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Changes (by nireldidi):

 * priority:  normal => important
 * status:  closed => reopened
 * resolution:  needs_more_info =>


Comment:

 ffmpeg -i test.gif animation.webp

 ffmpeg version N-93933-geae251ead9 Copyright (c) 2000-2019 the FFmpeg
 developers
   built with gcc 8.3.1 (GCC) 20190414
   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-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-libaom --enable-libmfx
 --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-
 nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
   libavutil      56. 28.100 / 56. 28.100
   libavcodec     58. 52.102 / 58. 52.102
   libavformat    58. 27.103 / 58. 27.103
   libavdevice    58.  7.100 / 58.  7.100
   libavfilter     7. 54.101 /  7. 54.101
   libswscale      5.  4.101 /  5.  4.101
   libswresample   3.  4.100 /  3.  4.100
   libpostproc    55.  4.100 / 55.  4.100
 Input #0, gif, from 'test.gif':
   Duration: 00:00:02.00, start: 0.000000, bitrate: 70 kb/s
     Stream #0:0: Video: gif, bgra, 150x150, 18.42 fps, 20 tbr, 100 tbn,
 100 tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (gif (native) -> webp (libwebp))
 Press [q] to stop, [?] for help
 Output #0, webp, to 'animation.webp':
   Metadata:
     encoder         : Lavf58.27.103
     Stream #0:0: Video: webp (libwebp), bgra, 150x150, q=2-31, 200 kb/s,
 20 fps, 1k tbn, 20 tbc
     Metadata:
       encoder         : Lavc58.52.102 libwebp
 [libwebp @ 000001aacbb6a9c0] Using libwebp for RGB-to-YUV conversion. You
 may want to consider passing in YUV instead for lossy encoding.
 frame=   37 fps=0.0 q=-0.0 Lsize=      41kB time=00:00:01.80 bitrate=
 187.6kbits/s speed=14.4x
 video:41kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: unknown

--
Ticket URL: <https://trac.ffmpeg.org/ticket/7941#comment:5>
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