[mythtv-commits] Ticket #12778: h264 Cap at ~2 threads for encoding?

[MythTV]

#12778: h264 Cap at ~2 threads for encoding?
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     Reporter:  Mitch Capper <mitch.capper@…>  |      Owner:  jyavenard
         Type:  Bug Report - General           |     Status:  new
     Priority:  minor                          |  Milestone:  unknown
    Component:  MythTV - Mythtranscode         |    Version:  Unspecified
     Severity:  medium                         |   Keywords:
Ticket locked:  0                              |
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 After setting HTTPLiveStreamThreads to 16 and seeing mythtranscode say its
 encoding with 16 threads (rather than the default 2) the CPU usage only
 went from 170%->220% (despite plenty of additional free cpus).
 I do see a hardcoded c->slices = 8; in avformatwriter.cpp for h264,  which
 sets the picture subdivisions im not sure if that is too low for more
 threads or its something else.

 If anyone has any initial thoughts or suggestions I am open to it,
 otherwise I will start tweaking settings to see if we can allow for more
 threads.

 There is such reference to a cap from about 4 years ago:
 http://www.gossamer-threads.com/lists/mythtv/users/531170#531170

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Ticket URL: <https://code.mythtv.org/trac/ticket/12778>
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