[MEncoder-users] hqdn3d=2:1:2 & -ovc x264

[Grozdan]

On Tue, Jun 29, 2010 at 10:00 PM, Goga777 <goga777 at bk.ru> wrote:
>> > I read somewhere that there is not any sense to use -vf hqdn3d=2:1:2 with -ovc x264 because it's
>> > useless
>>
>> why? If you have a mostly clean picture with very little noise in it
>> and you want to remove that, then you use some low denoise values. I
>> don't see how hqdn3d and x264 are mutually exclusive. Or are you
>> talking about the values?
>
> no, I'm not talking about the value, I'm talking about the idea.
> you understood me correctly

denoisers and encoders are not mutually exclusive so whomever wrote
what you read is, to say it politely, silly :)

If you have a very noisy picture and you want to clean it up, of
course you'll use a denoiser. This will also make the content better
compressible as a clean picture is easier to compress than a noisy
one, which means with (too much) noise in the picture, the encoder
will try to preserve it so it'll spend more bits for that. The
downside of denoising is that no denoiser is perfect and at times will
mistake areas that are *not* noise for noise so it'll throw them out,
thus reducing a bit of detail. How much and how often a denoiser will
do that depends on how it works. There are much better denoisers
around than hqdn3d, but unfortunately mplayer doesn't have a better
one so hqdn3d is considered its "best" denoiser

>
> thanks
>
>
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