[mythtv-commits] Ticket #12055: HLS transcode speed-up by enabling to tune x264 preset/tune

[MythTV]

#12055: HLS transcode speed-up by enabling to tune x264 preset/tune
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     Reporter:  warpme@…              |      Owner:
         Type:  Bug Report - General  |     Status:  new
     Priority:  minor                 |  Milestone:  unknown
    Component:  MythTV - General      |    Version:  Unspecified
     Severity:  medium                |   Keywords:
Ticket locked:  0                     |
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 x264 lib has capability to tune performance/quality for given deployment
 scenario. This patch allows user to select preset & tune for achieving
 desired speed-qualty compromise. Oryginal MythTV code is using defaults
 preset/tune: "medium/<null>". Setting preset to "ultrafast" and tune to
 "movie" gives me hard-to-notice-difference picture and 35-37% transcoding
 speedup. On 3220T (IVB i3, 35W) transcode 3-5Mb/s 1080i at 50 movie is approx
 30-35% faster than realtime while default settings give me 90-95% of
 realtime. User preset/tune change is arranged exactly the same like with
 transcode threads. E.g. to change preset from default 'medium' to
 'ultrafast', run mysql clinet in terminal and issue:

 {{{
 INSERT settings ( value, data, hostname ) VALUES ( 'HTTPLiveStreamPreset',
 'ultrafast', NULL);
 }}}
 To change preset, issue:
 {{{
 UPDATE settings SET data = 'medium' WHERE value = 'HTTPLiveStreamPreset';
 }}}
 x264 available presets are: ultrafast, superfast, veryfast, faster, fast,
 medium, slow, slower, veryslow, placebo
 To change tune from default 'null' to 'film', run mysql client in terminal
 and issue:
 {{{
 INSERT settings ( value, data, hostname ) VALUES ( 'HTTPLiveStreamTune',
 'movie', NULL);
 }}}
 Available tunes are: film, animation, grain, stillimage, psnr, ssim,
 fastdecode, zerolatency

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Ticket URL: <https://code.mythtv.org/trac/ticket/12055>
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