[FFmpeg-trac] #6513(avfilter:new): FFmpeg VAAPI hwaccel decode -> hwupload/hwdownload -> x264 will block

[FFmpeg]

#6513: FFmpeg VAAPI hwaccel decode -> hwupload/hwdownload -> x264 will block
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             Reporter:  mypopy    |                     Type:  defect
               Status:  new       |                 Priority:  important
            Component:  avfilter  |                  Version:  git-master
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
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 Summary of the bug:
 How to reproduce:
 {{{
 % ffmpeg -vaapi_device /dev/dri/renderD128 -hwaccel vaapi
 -hwaccel_output_format vaapi -i input.mp4 -vf
 'format=nv12|vaapi,hwupload,scale_vaapi=w=1280:h=720:format=yuv420p,hwdownload'
 -c:v libx264 output.mp4
 ffmpeg version : master branch (f1baafa)
 }}}
 Patches should be submitted to the ffmpeg-devel mailing list and not this
 bug tracker.

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Ticket URL: <https://trac.ffmpeg.org/ticket/6513>
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