[FFmpeg-user] u8 sample format is incompatible with aac

Tarun singhal tsinghal18 at gmail.com
Tue Dec 20 13:14:55 CET 2011

Oh! Thats a bad news for me. Actually I want to encode a particular media
file for thin-end devices and I want to choose the audio resolution as u8
rather than s16 and want to encode it as AAC only.Is there Any way I can
achieve that using FFmpeg.
And I know that quality will deteriorate but quality is not an issue in my
situtation, availibility is.
On Tue, Dec 20, 2011 at 3:41 PM, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:

> Tarun singhal <tsinghal18 <at> gmail.com> writes:
> > ffmpeg -i a.mp4 -samle_fmt u8 -vcodec libx264 -acodec aac -strict
> > experimental b.mp4
> >
> > This command gives error that: u8 sample format is incompatible with aac.
> > Assuming s16 by default.
> This is not an error, but a warning to inform you that the sample format
> had to
> be changed to to fit the encoder's needs.
> All aac encoders in FFmpeg currently only accept s16 (and none of the
> external
> libraries accept u8 afaict, some would accept s24, s32 and flt).
> Any reason you want to use u8?
> Carl Eugen
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