Changes between Version 16 and Version 17 of Encode/AAC


Ignore:
Timestamp:
Sep 17, 2013, 8:47:59 PM (4 years ago)
Author:
llogan
Comment:

add various ffaacenc notes

Legend:

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  • Encode/AAC

    v16 v17  
    102102 
    103103{{{ 
    104 ffmpeg -i input.wav -strict experimental -c:a aac -cutoff 15000 -q:a 6 output.m4a 
     104ffmpeg -i input.wav -strict experimental -c:a aac -q:a 6 output.m4a 
    105105}}} 
    106106 
    107 Effective range for `-q:a` is probably 0.1-10. If ffmpeg ignores `-q:a` then get a newer build (see ticket #[ticket:1346]). 
     107Effective range for `-q:a` is probably 0.1-10 (unverified). If ffmpeg ignores `-q:a` then get a newer build (see ticket #[ticket:1346]). 
    108108 
    109109==== Example using `-b:a` ==== 
    110110 
    111111{{{ 
    112 ffmpeg -i input.wav -strict experimental -c:a aac -cutoff 15000 -b:a 128k output.m4a 
     112ffmpeg -i input.wav -strict experimental -c:a aac -b:a 240k output.m4a 
    113113}}} 
     114 
     115  '''Note:''' `-cutoff 15000` was previously recommended for this encoder, but this is now automatically applied since 2012 July. 
    114116 
    115117---- 
     
    138140==== Average Bit Rate (ABR) Example ==== 
    139141{{{ 
    140 ffmpeg -i input.wav -c:a libfaac -b:a 128k output.m4a 
     142ffmpeg -i input.wav -c:a libfaac -b:a 192k output.m4a 
    141143}}} 
    142144 
     
    157159=== Which encoder should I use? What provides the best quality? === 
    158160 
    159 For AAC-LC the likely answer is: `libfdk_aac` > `libfaac` > Native FFmpeg AAC (`aac`) ≥ `libvo_aacenc`. 
     161For AAC-LC the likely answer is: `libfdk_aac` > `libfaac` > Native FFmpeg AAC encoder (`aac`) > `libvo_aacenc`. 
    160162 
    161163=== Should I use AAC-LC or AAC-HE? === 
     
    177179 
    178180List available metadata options for the MP4 container. 
     181 
     182Determine actual `-q:a` range for `aac` 
    179183}}}