Changes between Version 10 and Version 11 of Encode/AV1


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Timestamp:
Oct 27, 2018, 6:41:36 PM (3 weeks ago)
Author:
jamrial
Comment:

Mention that bitrate 0 is needed for Constant Quality mode.

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  • Encode/AV1

    v10 v11  
    2727= Constant Quality = 
    2828 
    29 libaom-av1 has a constant quality (CQ) mode (like CRF in x264 and x265) which will ensure that every frame gets the number of bits it deserves to achieve a certain (perceptual) quality level, rather than encoding each frame to meet a bit rate target. This results in better overall quality. 
     29libaom-av1 has a constant quality (CQ) mode (like CRF in x264 and x265) which will ensure that every frame gets the number of bits it deserves to achieve a certain (perceptual) quality level, rather than encoding each frame to meet a bit rate target. This results in better overall quality. If you do not need to achieve a fixed target file size, this should be your method of choice. 
    3030 
    31 If you do not need to achieve a fixed target file size, this should be your method of choice. 
     31To trigger this mode, you must use a combination of -crf and -b:v 0. -b:v '''MUST''' be 0.  
    3232 
    3333{{{ 
    34 ffmpeg -i input.mp4 -c:v libaom-av1 -crf 30 -strict experimental av1_test.mkv 
     34ffmpeg -i input.mp4 -c:v libaom-av1 -crf 30 -b:v 0 -strict experimental av1_test.mkv 
    3535}}} 
    3636