Changes between Version 11 and Version 12 of Encode/AV1

Timestamp:

Oct 27, 2018, 3:57:49 PM (8 years ago)

Author:

James

Comment:

Add constrained quality mode

Encode/AV1

@@ -15 +15 @@
 
 - Constant quality
+- Constrained quality
 - 2-pass average bitrate
 - 1-pass average bitrate
@@ -36 +37 @@
 
 The CRF value can be from 0–63. Lower values mean better quality and greater file size. 
+
+= Constrained Quality =
+
+libaom-av1 also has a constrained quality (CQ) mode that will ensure that a constant (perceptual) quality is reached while keeping the bitrate below a specified upper bound or within a certain bound. This method is useful for bulk encoding videos in a generally consistent fashion.
+
+{{{
+ffmpeg -i input.mp4 -c:v libaom-av1 -crf 30 -b:v 2000k -strict experimental output.mkv
+}}}
+
+The quality is determined by the `-crf`, and the bitrate limit by the `-b:v` where the bitrate '''MUST''' be non-zero.
+
+You can also specify a minimum and maximum bitrate instead of a quality target:
+
+{{{
+ffmpeg -i input.mp4 -c:v libaom-av1 -minrate 500k -b:v 2000k -maxrate 2500k -strict experimental output.mp4
+}}}
 
 = Two-Pass =