[FFmpeg-trac] #7405(undetermined:new): [ffmpeg-qsv][vc1_decode]vc1 decode drop frames on iHD driver.

[FFmpeg]

#7405: [ffmpeg-qsv][vc1_decode]vc1 decode drop frames on iHD driver.
-------------------------------------+-------------------------------------
             Reporter:               |                     Type:  defect
  zhuqingliang                       |                 Priority:  normal
               Status:  new          |                  Version:
            Component:               |  unspecified
  undetermined                       |               Blocked By:
             Keywords:  qsv decode   |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 {{{
 The number of ffmpeg-qsv decode frame is less than  yamidecode.
 }}}
 environment
 {{{
 SKL OS: ubuntu 16.04 kernel: 4.15.0
 libva b6c50dad4d7d14c507108d9f468662e2d7ae1c4d
 ​https://github.com/01org/libva.git
 VPG_Driver ed04556a6676fd77ff845508bc54bfc60915450c
 ​https://github.com/intel/media-driver
 libva-utils 9a10ad663349732decd668a426cfc349b0010d1d
 ​https://github.com/01org/libva-utils.git
 Mediasdk 7ea683585f0f84f1bea035a405855312c92c46c0 ​https://github.com
 /Intel-Media-SDK/MediaSDK
 FFMPEG 56f68a099cc607658118e00cad30569103ae3751
 ​https://git.ffmpeg.org/ffmpeg.git
 }}}
 How to reproduce:
 {{{
 1.build env as above lists
 2.ffmpeg -hwaccel qsv -hwaccel_device /dev/dri/renderD128 -v verbose -c:v
 vc1_qsv -i /media//yami_vc1/SA00046.vc1 -vf hwdownload,format=nv12
 -pix_fmt yuv420p -f rawvideo -vsync 0 -y ./dump.yuv
 3. message:
 frame=   29 fps=0.0 q=-0.0 Lsize=    1682kB time=00:00:01.24
 bitrate=11113.5kbits/s speed=49.4x
 4. yamidecode -i /media//yami_vc1/SA00046.vc1 -m0
 5. message:
 30 frame decoded, fps = 4285.71. fps after 5 frames = 5000.00.

 }}}

 failed case
 {{{
 SA00046.vc1
 SA00048.vc1
 SA00052.vc1
 SA00058.vc1
 SA00066.vc1
 SA00067.vc1
 SA00079.vc1
 SA10090.vc1
 SA10092.vc1
 SA10094.vc1
 SA10104.vc1
 SA10106.vc1
 SA10108.vc1
 SA10110.vc1
 SA10120.vc1
 SA10131.vc1
 SA20017.vc1
 SA20018.vc1
 SA20020.vc1
 SA20021.vc1
 SA20028.vc1
 SA20030.vc1
 SA40011.vc1
 SA40013.vc1
 SA00050.vc1
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/7405>
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