[FFmpeg-trac] #7598(undetermined:new): Add row-mt option to libaom-av1

[FFmpeg]

#7598: Add row-mt option to libaom-av1
-------------------------------------+-------------------------------------
             Reporter:  Ewout        |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  unspecified  |  undetermined
             Keywords:  libaom       |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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Comment (by Ewout):

 In the latest build of aomenc
 1.0.0-1009-g[https://aomedia.googlesource.com/aom/+/2d7eb8bce5c413e0944917cdfd378c26f4e3f85b
 2d7eb8bce] it's not enabled by default:
 `--row-mt=<arg>   Enable row based multi-threading (0: off (default), 1:
 on)`

 Also, when running ffmpeg (20181205-2c64a6b) CPU usage never spikes above
 35%, averaging around 27% on a quad-core machine.

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Ticket URL: <https://trac.ffmpeg.org/ticket/7598#comment:2>
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