[FFmpeg-user] Why ffmpeg libx265 generate way smaller files than cuda/nvidia based one?

[david stephen]

dont believe such thing like this more fast than this. what all terms exist
it just marketing. like say implementation h265 from nvidia more fast.
implementation h265 from other company more slow and good size. all
implementation is same. its about default config that set into preset like
CUDA, QuickSync. i already test such thing. what the different one to
other. its about parallel in using resource. like preset CUDA can enable
proc and gpu in same time. while like ffmpeg cant.

its just about business. new gpu from nvidia will lock such thing. so
ffmpeg will lose to nvidia cause cant optimize nvidia preset.

Pada tanggal Sab, 6 Agu 2022 pukul 02.02 jatmvp ctf <
justanotherteammate at gmail.com> menulis:

> Maybe my question is not correct. If both encode H.265 but I thought the
> performance ability (to create compression ratio) should be the same or at
> least comparable.
>
> That means CUDA version is only for some purposes and traditional open
> libx265 version for others? I guess, the CUDA is only for streaming, but
> then the decrease size of frames ( so increased compression ratio) to
> produce fast
>
> Harald, could you elaborate about those because I am really excited to know
> about it. Maybe I have compiled something wrong. I've been looking at it
> from yesterday so maybe I missed something in documentation :)
>
> Best regards.
>
> pt., 5 sie 2022 o 18:38 jatmvp ctf <justanotherteammate at gmail.com>
> napisał(a):
>
> > Different implementation of same standard should not behave way different
> > I assume, or not have same features or performance (at least).
> >
> > Could you describe a little more or at least give source?
> >
> > What are you suggesting by different implementation exactly then?
> >
> > I guess from your short message that CPU is OK and nVidia's is bad,
> saying
> > - "it is different" but for me it is not metrics when you not give facts
> >
> > pt., 5 sie 2022 o 17:46 Reindl Harald <h.reindl at thelounge.net>
> napisał(a):
> >
> >>
> >>
> >> Am 05.08.22 um 17:02 schrieb jatmvp ctf:
> >> > I have problem with understanding why my ffmpeg with nVidia features
> (as
> >> > v:c hevc_nvenc) generate way larger file in comparison to libx265
> >>
> >> because it's a different implementation
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