[FFmpeg-trac] #7534(avcodec:new): I used ffmpeg 4.02 + rockchip_mpp +libdrm to decodec H264 and get a AVFrame , this format is DRM_PRIME, how do i convert to a cv::mat or bgr or yuv420p?

[FFmpeg]

#7534: I used ffmpeg 4.02 + rockchip_mpp  +libdrm to decodec H264 and get a
AVFrame ,this format is DRM_PRIME,how do i convert to a cv::mat or bgr or
yuv420p?
-------------------------------------+-------------------------------------
             Reporter:  gtom         |                     Type:  defect
               Status:  new          |                 Priority:  important
            Component:  avcodec      |                  Version:  git-
             Keywords:  decodec      |  master
  with rkmpp                         |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 I used ffmpeg 4.02 + rockchip_mpp  +libdrm to decodec H264 and get a
 AVFrame ,this format is DRM_PRIME,how do i convert to a cv::mat or bgr or
 yuv420p?

 I used swscontext to convert, but it not support DRM_PRIME format.
 how should i do？？

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Ticket URL: <https://trac.ffmpeg.org/ticket/7534>
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