HLS transcode speed-up by enabling to tune x264 preset/tune

[warpme@…]

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@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

[warpme@…]

patch to transcoder speed-up

[Warpme <warpme@…>]

In 2dbf1f382236c2001683a74f9f6fe7fc46a89412/mythtv:

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