[FFmpeg-trac] #6948(avcodec:new): Chinese DTMB streams playback issue (cavs codec artifacts)

[FFmpeg]

#6948: Chinese DTMB streams playback issue (cavs codec artifacts)
---------------------------------+---------------------------------------
             Reporter:  aospan   |                     Type:  defect
               Status:  new      |                 Priority:  normal
            Component:  avcodec  |                  Version:  unspecified
             Keywords:  cavs     |               Blocked By:
             Blocking:           |  Reproduced by developer:  0
Analyzed by developer:  0        |
---------------------------------+---------------------------------------
 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

 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/6948>
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