[FFmpeg-trac] #4726(undetermined:new): DXVA not functional with resolutions greater than 1080 on AMD GPUs

[FFmpeg]

#4726: DXVA not functional with resolutions greater than 1080 on AMD GPUs
-------------------------------------+-------------------------------------
             Reporter:  Chipcraft    |                     Type:  defect
               Status:  new          |                 Priority:  important
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:  UVD, AMD,    |               Blocked By:
  4K, DXVA                           |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 AMDs fixed function video decoder engine (UVD) has supported
 H.264/VC-1/WMV decoding at 4K resolution since 5.0 version, which was
 introduced in Tonga ASIC. Since the launch of Tonga the decoder engine has
 evolved even further and the sixth version now support HEVC decoding at 4K
 resolution. The UVD6.x decoder was introduced in Wani (Carrizo SoC) and
 Fiji ASIC.

 Currently all supported formats, on all ASICs (as listed previously) will
 fail to decode on ffmpeg through DXVA. All of the formats however can be
 decoded up to 1920x1080 resolution without any issues. Regardless of the
 format anything beyond this resolution will fall back to software decoder.

 The DXVA acceleration works through Microsoft´s DTV DirectShow codec
 without any issues: H.264 has been validated at 4K in Windows 7 and HEVC
 has been validated at 4K in Windows 10 RTM with the same exact display
 drivers.

 {{{
 2.6 - 2.7.1 / master
 built on GCC 4.9.2 / 5.10 (MingW)
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/4726>
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