linux-kernel - Re: [RFC 08/12] media: hantro: Fix H264 decoding of field encoded content

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Date:   Tue, 03 Sep 2019 17:01:56 +0200
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Jonas Karlman <jonas@...boo.se>,
        Ezequiel Garcia <ezequiel@...labora.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil@...all.nl>,
        Boris Brezillon <boris.brezillon@...labora.com>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "linux-rockchip@...ts.infradead.org" 
        <linux-rockchip@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC 08/12] media: hantro: Fix H264 decoding of field encoded
 content

On Tue, 2019-09-03 at 14:02 +0000, Jonas Karlman wrote:
> On 2019-09-03 15:21, Philipp Zabel wrote:
> > On Sun, 2019-09-01 at 12:45 +0000, Jonas Karlman wrote:
> > > This need code cleanup and formatting
> > > 
> > > Signed-off-by: Jonas Karlman <jonas@...boo.se>
> > 
> > The previous patches all work, but this patch breaks decoding of
> > progressive content for me (i.MX8MQ with FFmpeg based on Ezequiel's
> > branch).
> 
> Please try with ffmpeg based on my v4l2-request-hwaccel-4.0.4-hantro branch at [1],
> up to and including the commit "HACK: add dpb flags for reference usage and field picture".
> That commit adds code to set reference flags needed by the changes in this patch.
> 
> There is probably also some other minor difference between our two ffmpeg branches.
> I have not observed any issues with progressive content with this patch and my ffmpeg branch (on a RK3288 device).
> Some H264 reference samples do have visual issues after this patch, however all my real world samples does seem to work.
> 
> My branch use libudev to probe media/video devices and needs to be configured with:
> --enable-v4l2-request --enable-libudev --enable-libdrm
> 
> [1] https://github.com/Kwiboo/FFmpeg/commits/v4l2-request-hwaccel-4.0.4-hantro

I hadn't realized that this is a backwards incompatible change. With
your branch rebased onto n4.2, and this patch applied, decoding seems to
work.

regards
Philipp