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linux:multimedia:movie:ffmpeg_performance [2019/10/03 11:12] – created niziaklinux:multimedia:movie:ffmpeg_performance [2021/02/07 11:29] (current) – niziak
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 ====== x265 encoding ====== ====== x265 encoding ======
  
 +===== Metadata tag =====
 +Some players rely on metadata to identify if the contents of the file can be used (i.e.: QT)
 +<code bash>-tag:v hvc1</code>
 +
 +
 +===== Performance =====
 +FFmpeg supports following presets: ''ultrafast'', ''superfast'', ''veryfast'', ''faster'', ''fast'', ''medium'', ''slow'', ''slower'', ''veryslow'', and ''placebo''
 +
 +According to:
 +  * [[https://brandur.org/fragments/ffmpeg-h265#section-3|The `fast` preset]]
 +  * [[https://write.corbpie.com/ffmpeg-preset-comparison-x265-2019-encode-speed-and-file-size/|FFmpeg preset comparison x265 2019; Encode speed and file size]]
 +
 +and own fast tests:
 +<code>
 +  * veryslow: encoded 140 frames in 130.17s ( 1.08 fps), 1424.91 kb/s, Avg QP:27.02
 +  * slower:   encoded 140 frames in  66.19s ( 2.12 fps), 1412.11 kb/s, Avg QP:26.91
 +  * slow:     encoded 140 frames in  20.36s ( 6.88 fps), 1448.34 kb/s, Avg QP:26.61
 +  * medium:   encoded 140 frames in   9.44s (14.83 fps), 1260.54 kb/s, Avg QP:26.68
 +  * fast:     encoded 140 frames in   6.13s (22.82 fps), 1244.63 kb/s, Avg QP:26.71
 +  * faster:   encoded 140 frames in   5.02s (27.87 fps), 1221.05 kb/s, Avg QP:26.76
 +</code>
 +
 +
 +The default ''medium'' is enough (or even ''fast'').
 +
 +
 +===== Ryzen 7 =====
 +
 +Preset: veryslow
 Ryzen 7 8c/16t Ryzen 7 8c/16t
  
-^ threads        ^ time^ +^  threads        ^  time             ^ 
-| auto (16)      | 103.05s (1.83fps) | +|  auto (16)      | 103.05s (1.83fps) | 
-| 12             | 103.76s (1.82fps) | +|  12             | 103.76s (1.82fps) | 
-| 8              | 107.09s (1.76fps) |+|  20             | 103.93s (1.82fps) | 
 +|  8              | 107.09s (1.76fps) | 
 +|  6              | 136.09s (1.39fpc) |