[FFmpeg-devel] Blu Ray drive donation

Carl Eugen Hoyos cehoyos
Mon Mar 16 23:48:24 CET 2009

Justin Ruggles <justin.ruggles <at> gmail.com> writes:

> E-AC-3 using spectral extension is not supported yet (I just haven't had
> the motivation to clean up the patch).  I've only come across 2 samples
> which use this, and they are both from HD-DVDs.

Could you note this somewhere so it is not forgotten?

> Apparently there are some streams that mix regular AC-3 and TrueHD in
> the same substream.

I meant those, thank you.

> It seems the TrueHD frame is placed after the AC-3
> frame.  I'm not sure if it provides additional channels or is a lossless
> version of what's in the AC-3.  My first guess is that it's the same
> audio encoded twice because TrueHD is an optional codec in Blu-ray, but
> AC-3 is mandatory.  Maybe it's both..lossless version of 6 channels plus
> extra channels.  Anyone else know more about this?  Or better yet, have
> some samples?


Carl Eugen

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