[FFmpeg-user] FFPLAY plays some audio files at their native amplitude while others are playing 3dB down in amplitude

Carl Eugen Hoyos ceffmpeg at gmail.com
Tue Mar 10 04:00:57 EET 2020

Am Di., 10. März 2020 um 02:51 Uhr schrieb Rick Keniuk <daddyo323 at gmail.com>:
> You found it Ted...  FFPLAY interprets a mono (single channel WAV) file
> to be played at -3dB from full scale while the other programs set the
> mono file at full scale on both stereo channels. I simply modified my
> Matlab code to generate a stereo file with identical channels (from the
> original single channel data) and that fixed it.  I guess they are
> "power dividing" the single channel signal.  I don't think I agree with
> FFPLAY's interpretation of the amplitude of a single channel WAV file
> but that is what is happening.

I cannot rule out that this is "ffplay's interpretation" but it is more likely
that this is related to sdl, the library that ffplay uses for display and

Please find out what top-posting means and avoid it here, Carl Eugen

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