Re: Installing ffmeg-free degrades firefox video support

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On Thu, Jun 16, 2022 at 9:41 AM Demi Marie Obenour
<demiobenour@xxxxxxxxx> wrote:
>
> On 6/10/22 07:45, Martin Stransky wrote:
> > On 6/10/22 11:44, Vitaly Zaitsev via devel wrote:
> >> On 10/06/2022 05:08, Gary Buhrmaster wrote:
> >>> I admit I have not checked, but does ffmpeg-free include
> >>> the hardware GPU support for the various patented
> >>> codecs (letting the GPU vendor pay the license costs
> >>> for the decoder) and if not, would RH legal consider
> >>> adding that hardware driver support acceptable to
> >>> ffmpeg-free?
> >>
> >> Hardware decoding in ffmpeg is nonfunctional with stripped build-in
> >> codecs parts.
> >
> > That's not exactly correct, for instance internal ffmpeg AV1 decoder is
> > VA-API only, i.e. accelerated and ffmpeg does not ship internal SW decoder.
> >
> > OTOH I don't believe it's possible to use H.264 HW decoding without
> > patented parts as the decoding involves buffers ordering/stream
> > extraction and so on.'
>
> That might actually be a good thing from a security perspective,
> inasmuch as it means that the parsing is happening in the host and
> not in on-device firmware.

Yes, hardware accelerated decoding is always partially in software for
this reason. Whether it's in ffmpeg itself for VA-API or in the Intel
Media Driver for QuickSync Video (QSV), the bitstream parsing is
generally not on the hardware itself.



-- 
真実はいつも一つ!/ Always, there's only one truth!
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