Opened 2 years ago

Last modified 20 months ago

#9754 open defect

block artifacts with ffvp8

Reported by: jzern Owned by:
Priority: important Component: avcodec
Version: git-master Keywords: vp8 race regression
Cc: Blocked By:
Blocking: Reproduced by developer: yes
Analyzed by developer: no


Summary of the bug:
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':
    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)
      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.

Attachments (2)

1312737577-2s.webm (46.2 KB ) - added by jzern 2 years ago.
Screenshot_20220428_193734.png (557 bytes ) - added by jzern 2 years ago.

Download all attachments as: .zip

Change History (5)

by jzern, 2 years ago

Attachment: 1312737577-2s.webm added

by jzern, 2 years ago

comment:1 by Carl Eugen Hoyos, 20 months ago

Component: undeterminedavcodec
Keywords: vp8 regression added
Priority: normalimportant
Reproduced by developer: set
Version: unspecifiedgit-master

Regression since 7b5ff7d57355dc608f0fd86e3ab32a2fda65e752, not reproducible with -threads 1

comment:2 by Carl Eugen Hoyos, 20 months ago

Keywords: race added
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