• FFmpeg官方 AAC 編碼文檔

CBR 模式 Constant Bit Rate (CBR) mode

• These settings target a specific bit rate, with less variation between samples.
• It gives you greater control over file size, and it is compatible with the HE-AAC profile.
• As a rule of thumb, for audible transparency, use 64 kBit/s for each channel (so 128 kBit/s for stereo, 384 kBit/s for 5.1 surround sound).

Set the bit rate with the -b:a option.

• 我的這種 -ab 96k 不是CBR吧:

##1 copy flv file ffmpeg -re -stream_loop -1 -i 30_bbb_sunflower_1080p_30fps_normal.mp4 -c:a libfdk_aac -ar 44100 -ac 2 -ab 96k -profile:a aac_he_v2 -vcodec cop

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