Differences

This shows you the differences between two versions of the page.

--- linux:multimedia:movie:ffmpeg_performance [2019/10/03 11:30]
niziak
+++ linux:multimedia:movie:ffmpeg_performance [2021/02/07 11:29] (current)
niziak
@@ Line 2: / Line 2: @@
 ====== 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