17:11:56         verb3k | Dark_Shikari, Do different presets have an effect on quality when used with CRF?
17:12:40  @Dark_Shikari | verb3k: yes, but not too much.
17:12:47  @Dark_Shikari | a 0th-order approximation is that they have no effect.
17:13:08  @Dark_Shikari | The main reason there's a difference is because the preset affects how x264 itself measures quality
17:13:13  @Dark_Shikari | that is, it uses better, more accurate methods of measuring quality
17:13:19  @Dark_Shikari | obviously, this will affect the definition of what -crf does!
17:13:32  @Dark_Shikari | It's just not too much, so we can mostly ignore it.
17:17:07  @Dark_Shikari | verb3k: specifically, there are three big things that can affect the definition of quality
17:17:10  @Dark_Shikari | 1) AQ being on/off
17:17:16  @Dark_Shikari | jump: ultrafast to superfast
17:17:19  @Dark_Shikari | 2) mbtree being on/off
17:17:22  @Dark_Shikari | jump: superfast to veryfast
17:17:26  @Dark_Shikari | 3) psy-rd being on/off
17:17:29  @Dark_Shikari | jump: faster to fast
17:17:33  @Dark_Shikari | above fast there are no more big jumps.