linux-kernel - Re: [PATCH v2 00/12] media: rkvdec: Add support for VDPU381 and VDPU383

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Message-Id: <DCV98UFRGHAS.2DGZOEOVN9WNX@cknow.org>
Date: Wed, 17 Sep 2025 19:34:53 +0200
From: "Diederik de Haas" <didi.debian@...ow.org>
To: "Detlev Casanova" <detlev.casanova@...labora.com>,
 <linux-kernel@...r.kernel.org>
Cc: "Mauro Carvalho Chehab" <mchehab@...nel.org>, "Heiko Stuebner"
 <heiko@...ech.de>, <linux-media@...r.kernel.org>,
 <linux-rockchip@...ts.infradead.org>,
 <linux-arm-kernel@...ts.infradead.org>, <kernel@...labora.com>
Subject: Re: [PATCH v2 00/12] media: rkvdec: Add support for VDPU381 and
 VDPU383

Hi Detlev,

On Fri Aug 8, 2025 at 10:03 PM CEST, Detlev Casanova wrote:
> These variants are found respectively in the RK3588 and RK3576 SoCs.
> This patch only adds support for H264 and H265 in both variants.

I tested this on my Rock 5B (rk3588) with (ffmpeg and) mpv on Debian
Forky with sway and I was quite impressed with the results :-)

In my earlier testing I found that the classic BBB video made for a
really good test video and it played REALLY well. The 1080p version in
both x264 and 8-bit x265 played without frame drops, although when
pressing 'I' to show video info over the video it dropped some frames.
But that never resulted in any visible artifacts.
On the 2160p version I did see quite a number of dropped frames, but
didn't notice any visual artifacts. Maybe that it got displayed on a
1080p monitor had something to do with it?

10-bit encoded x265 files (still) resulted in a completely blue output,
but I have strong reasons to believe that's due to 'missing pieces' (ie
NV15 support) in the rest of the display pipeline.

The displayed video seemed sharper and better then in my other tests.
I thought I did see an artifact around 5:50 when a big rock almost fell
on the little animal. Looking further, it appears to be an artifact in
the original video :-O (I saw it also on my AMD GPU on my amd64 system
and also when using software decoding).
The fact I only noticed it when testing this patch set is saying a lot
... in a positive way! So I'm happy to provide my

Tested-by: Diederik de Haas <didi.debian@...ow.org>  # Rock 5B

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