当我使用 mpv（xubuntu 18.04 LTS）播放视频时，每隔几分钟就会出现所谓的“关键帧”伪影。
基本上，这看起来像是视频解码关键帧失败，并继续从前一帧插入中间帧。它通常会在下一个成功的关键帧中消失。奇怪的是，它只影响帧的下半部分。
我尝试运行mpv --msg-level=all=v，但没有显示任何错误。当错误发生时，我设法暂停，结果如下：
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.2 LTS
Release: 18.04
Codename: bionic
$ uname -roms
Linux 4.15.0-54-generic x86_64 GNU/Linux
$ ffmpeg
ffmpeg version 3.4.6-0ubuntu0.18.04.1 Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
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
libavresample 3. 7. 0 / 3. 7. 0
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}...
Use -h to get full help or, even better, run 'man ffmpeg'
$ mpv --version
mpv 0.27.2 (C) 2000-2017 mpv/MPlayer/mplayer2 projects
built on UNKNOWN
ffmpeg library versions:
libavutil 55.78.100
libavcodec 57.107.100
libavformat 57.83.100
libswscale 4.8.100
libavfilter 6.107.100
libswresample 2.9.100
ffmpeg version: 3.4.6-0ubuntu0.18.04.1
$ lspci -vnn | grep VGA -A 10
00:02.0 VGA compatible controller [0300]: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0116] (rev 09) (prog-if 00 [VGA controller])
Subsystem: Lenovo 2nd Generation Core Processor Family Integrated Graphics Controller [17aa:21fa]
Flags: bus master, fast devsel, latency 0, IRQ 28
Memory at f0000000 (64-bit, non-prefetchable) [size=4M]
Memory at e0000000 (64-bit, prefetchable) [size=256M]
I/O ports at 5000 [size=64]
[virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
Capabilities: <access denied>
Kernel driver in use: i915
Kernel modules: i915
我相信 vlc 也会发生这种情况，但我现在无法确认。使用内置硬盘的 matroska（也许还有其他，尚未测试）媒体时会发生这种情况。使用网络浏览器的流媒体时不会发生这种情况。有办法解决这个问题吗？