Chinese DTMB streams playback issue (cavs codec artifacts)

[Abylay Ospan]

Summary of the bug:

I have made dump of DTMB streams (digital TV standard in China, like DVB-T in Europe, etc).
Here is all files shared (50MB from each multiplex frequency):

​https://tv.jokersys.com/2018/01/06/chinese-dtmb-ts-dumps/

artifacts if we try to play:

ffplay sands-754mhz.ts

cavs video codec reported:

Stream #0:13[0x17d]: Video: cavs (B[0][0][0] / 0x0042), yuv420p,

720x576, 25 fps, 25 tbr, 90k tbn, 25 tbc

Do we have here video stream not fully compatible with ffmpeg's implementation of cavs (./libavcodec/cavsdec.c ) ?

How to reproduce:

$ ffplay sands-754mhz.ts

ffmpeg and ffplay is from Ubuntu 17.04:

$ /usr/bin/ffplay 
ffplay version 3.2.4-1build2 Copyright (c) 2003-2017 the FFmpeg developers
  built with gcc 6.3.0 (Ubuntu 6.3.0-8ubuntu1) 20170221
  configuration: --prefix=/usr --extra-version=1build2 --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-libebur128 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --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-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  libavutil      55. 34.101 / 55. 34.101
  libavcodec     57. 64.101 / 57. 64.101
  libavformat    57. 56.101 / 57. 56.101
  libavdevice    57.  1.100 / 57.  1.100
  libavfilter     6. 65.100 /  6. 65.100
  libavresample   3.  1.  0 /  3.  1.  0
  libswscale      4.  2.100 /  4.  2.100
  libswresample   2.  3.100 /  2.  3.100
  libpostproc    54.  1.100 / 54.  1.100
Simple media player