Changes between Version 16 and Version 17 of Encode/AAC
- Timestamp:
- Sep 17, 2013, 5:47:59 PM (13 years ago)
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Encode/AAC
v16 v17 102 102 103 103 {{{ 104 ffmpeg -i input.wav -strict experimental -c:a aac - cutoff 15000 -q:a 6 output.m4a104 ffmpeg -i input.wav -strict experimental -c:a aac -q:a 6 output.m4a 105 105 }}} 106 106 107 Effective range for `-q:a` is probably 0.1-10 . If ffmpeg ignores `-q:a` then get a newer build (see ticket #[ticket:1346]).107 Effective range for `-q:a` is probably 0.1-10 (unverified). If ffmpeg ignores `-q:a` then get a newer build (see ticket #[ticket:1346]). 108 108 109 109 ==== Example using `-b:a` ==== 110 110 111 111 {{{ 112 ffmpeg -i input.wav -strict experimental -c:a aac - cutoff 15000 -b:a 128k output.m4a112 ffmpeg -i input.wav -strict experimental -c:a aac -b:a 240k output.m4a 113 113 }}} 114 115 '''Note:''' `-cutoff 15000` was previously recommended for this encoder, but this is now automatically applied since 2012 July. 114 116 115 117 ---- … … 138 140 ==== Average Bit Rate (ABR) Example ==== 139 141 {{{ 140 ffmpeg -i input.wav -c:a libfaac -b:a 1 28k output.m4a142 ffmpeg -i input.wav -c:a libfaac -b:a 192k output.m4a 141 143 }}} 142 144 … … 157 159 === Which encoder should I use? What provides the best quality? === 158 160 159 For AAC-LC the likely answer is: `libfdk_aac` > `libfaac` > Native FFmpeg AAC (`aac`) ≥`libvo_aacenc`.161 For AAC-LC the likely answer is: `libfdk_aac` > `libfaac` > Native FFmpeg AAC encoder (`aac`) > `libvo_aacenc`. 160 162 161 163 === Should I use AAC-LC or AAC-HE? === … … 177 179 178 180 List available metadata options for the MP4 container. 181 182 Determine actual `-q:a` range for `aac` 179 183 }}}
