Changes between Version 11 and Version 12 of Encode/AV1


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Timestamp:
Oct 27, 2018, 6:57:49 PM (3 weeks 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 =