[FFmpeg-trac] #9754(undetermined:new): block artifacts with ffvp8

[FFmpeg]

#9754: block artifacts with ffvp8
-------------------------------------+-------------------------------------
             Reporter:  jzern        |                     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:
 N-106738-g3946cb02fc
 Towards the end of the attached clip in the lower right corner a streak of
 uninitialized/zero (green) blocks will be displayed. The clip decodes
 correctly with -vcodec libvpx (v1.11.0-192-g2858ef9ec).

 How to reproduce:
 {{{
 % ffplay /tmp/1312737577-2s.webm
 ffplay version 4.4.1-3 Copyright (c) 2003-2021 the FFmpeg developers
   built with gcc 11 (Debian 11.2.0-13)
   configuration: --prefix=/usr --extra-version=3 --toolchain=hardened
 --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu
 --arch=amd64 --enable-gpl --disable-stripping --enable-gnutls --enable-
 ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b
 --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d
 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-
 libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-
 libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt
 --enable-libopus --enable-libpulse --enable-librabbitmq --enable-
 librubberband --enable-libshine --enable-libsnappy --enable-libsoxr
 --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora
 --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx
 --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid
 --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-
 omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2
 --enable-pocketsphinx --enable-librsvg --enable-libmfx --enable-libdc1394
 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r
 --enable-libx264 --enable-shared
   libavutil      56. 70.100 / 56. 70.100
   libavcodec     58.134.100 / 58.134.100
   libavformat    58. 76.100 / 58. 76.100
   libavdevice    58. 13.100 / 58. 13.100
   libavfilter     7.110.100 /  7.110.100
   libswscale      5.  9.100 /  5.  9.100
   libswresample   3.  9.100 /  3.  9.100
   libpostproc    55.  9.100 / 55.  9.100
 Input #0, matroska,webm, from '/tmp/1312737577-2s.webm':
   Metadata:
     ENCODER         : Lavf59.22.100
   Duration: 00:00:01.85, start: 0.000000, bitrate: 204 kb/s
   Stream #0:0: Video: vp8, yuv420p(tv, bt470bg/unknown/unknown,
 progressive), 1920x884, SAR 1:1 DAR 480:221, 25 fps, 25 tbr, 1k tbn, 1k
 tbc (default)
     Metadata:
       DURATION        : 00:00:01.847000000
    1.36 M-V:  0.157 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0

 }}}

 There is a longer version with additional artifacts, but the attached is
 sufficient to show some of the issue. I'll create further issues if they
 persist after this one is fixed.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/9754>
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