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linux:multimedia:movie:ffmpeg_performance [2019/10/03 11:12] niziak |
linux: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) | | ||
+ | | 20 | 103.93s (1.82fps) | | ||
| 8 | 107.09s (1.76fps) | | | 8 | 107.09s (1.76fps) | | ||
+ | | 6 | 136.09s (1.39fpc) | | ||