AAC VBR produces files of equal size

Free all in one audio/video ffmpeg batch encoder

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AAC VBR produces files of equal size

Forum: General Discussion

Creator: Francisco Yanez

Created: 2023-02-20

Updated: 2023-02-25

Francisco Yanez - 2023-02-20

Hi.

I just noticed that the file size when using AAC VBR is the same no matter what quality you choose (0 to 4).

I am doing something wrong?

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Abel - 2023-02-25

You're right, vbr parameter is only supported by Fraunhofer libfdk-aac, but due to license constraints, it cannot be included in free ffmpeg versions, it must be compiled by individual users.

To achieve vbr with native aac, you can use -q:a from 0.1 to 2. For example -q:a 1

But it is not so efficient so cbr is recommended.

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