Changes between Version 11 and Version 12 of Encode/AV1


Ignore:
Timestamp:
Oct 27, 2018, 6:57:49 PM (9 months ago)
Author:
jamrial
Comment:

Add constrained quality mode

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  • Encode/AV1

    v11 v12  
    1515
    1616- Constant quality
     17- Constrained quality
    1718- 2-pass average bitrate
    1819- 1-pass average bitrate
     
    3637
    3738The CRF value can be from 0–63. Lower values mean better quality and greater file size.
     39
     40= Constrained Quality =
     41
     42libaom-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.
     43
     44{{{
     45ffmpeg -i input.mp4 -c:v libaom-av1 -crf 30 -b:v 2000k -strict experimental output.mkv
     46}}}
     47
     48The quality is determined by the `-crf`, and the bitrate limit by the `-b:v` where the bitrate '''MUST''' be non-zero.
     49
     50You can also specify a minimum and maximum bitrate instead of a quality target:
     51
     52{{{
     53ffmpeg -i input.mp4 -c:v libaom-av1 -minrate 500k -b:v 2000k -maxrate 2500k -strict experimental output.mp4
     54}}}
    3855
    3956= Two-Pass =