Re: [ANNv4] Media Summit on May 26th in Nice, France

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

On Tue, Apr 14, 2026 at 09:20:56AM +0200, Michael Riesch wrote:
> On 4/14/26 08:55, Ricardo Ribalda wrote:
> > On Tue, 14 Apr 2026 at 08:47, Hans Verkuil <hverkuil+cisco@kernel.org> wrote:
> >> On 13/04/2026 23:16, Laurent Pinchart wrote:
> >>> On Mon, Apr 13, 2026 at 04:25:54PM -0400, Nicolas Dufresne wrote:
> >>>> Le lundi 13 avril 2026 à 23:19 +0300, Laurent Pinchart a écrit :
> >>>>> On Mon, Apr 13, 2026 at 10:03:52PM +0200, Loic Poulain wrote:
> >>>>>> Hi Hans,
> >>>>>>
> >>>>>> I would be happy to discuss this if a slot is available:
> >>>>>>
> >>>>>> Title: Generic V4L2 ISP M2M framework
> >>>>>> Presenter: Loic Poulain
> >>>>>> Time estimate: ~20min
> >>>>>> Description: During early development of a Qualcomm Offline Image
> >>>>>> Processing Engine (OPE), we relied on the V4L2 memory‑to‑memory
> >>>>>> (v4l2‑m2m) framework, which is widely used and provides solid support
> >>>>>> for buffer management and scheduling. However, applying it to an ISP
> >>>>>> use case exposes limitations: ISP engines often require a richer media
> >>>>>> graph, with multiple pads and metadata flows, similar to inline ISP
> >>>>>> pipelines (params, stats, outputs). This talk proposes discussing the
> >>>>>> need for and design of a common V4L2 ISP M2M framework to factor out
> >>>>>> shared functionality across drivers, particularly around buffer/queue
> >>>>>> management and job scheduling.
> 
> It seems that we share some pain points.. :-) :-/
> 
> Over the last year, some ideas have been brewing in my mind. Not
> necessarily *my* ideas, mind you, rather ideas that have been around in
> linux-media for quite a while, actually. What I would like to prepare
> for the Media Summit goes along the same lines.
> 
> >>>>> That's well aligned with the v4l2-isp framework that Jacopo started, and
> >>>>> to the multi-context and media-jobs APIs that we have proposed. I
> >>>>> wonder, however, if a short session at the media summit will be enough,
> >>>>> or if we should try to organize a half day brainstorming workshop at
> >>>>> some point. Depending on when the people interested in this topic plan
> >>>>> to arrive, Monday could be an option.
> >>>>
> >>>> I'm also/still interested in the multi-context for m2m decoders that have inline
> >>>> post-processing capabilities (current model forces us to waste a lot of RAM). We
> >>>> just restarted some design discussion with the team, with an increased
> >>>> confidence that multi-context is the way. The scheduler could come handy in the
> >>>> future if we get to deal with more multi-stage codecs in the future. I'll be in
> >>>> Nice all day Monday.
> >>>
> >>> I will unfortunately be available only until 15:00 on Monday, but Jacopo
> >>> should be available through the day. Let's see who would be interested
> >>> and available, and try to organize something.
> >>
> >> I'm available on Monday as well. I think this is a topic that is well suited
> >> to a brainstorm session.
> > 
> > I am also available on Monday and would like to attend the session.
> 
> I'd be interested too. Right now the plan is to arrive on Monday
> afternoon. Depending on what time you agree on it may work out anyway.
> It would be great to know the exact time this session will start (as I
> might need to adjust my travel arrangements).

We need a volunteer to organize this, as in finding and booking a
meeting space. Note that Monday is a public holiday in France (Monday
the 25th of May in particular, not all Mondays).

If the number of attendees was small I was thinking of hosting the event
in the place where the Ideas on Board team will be staying, but it looks
like we're already reaching a fair number of people.

> > Regards!
> > 
> >> The agenda for the media summit is getting quite full, and I agree with Laurent
> >> that 20 minutes is likely not enough. If we can so a session on Monday instead,
> >> then that would be a good solution.
> 
> Apart from the time and date the scope of this session would be interesting.
> 
> Will this be a birds of a feather session in which the next generation
> kernel ISP framework will be discussed? Or even the next generation
> kernel video processing framework, where video processing is image
> signal processing, encoding/decoding, 2D graphics processing (fisheye
> correction units, 2D GPU such as the Rockchip RGA3, ...)?

I would focus on Loic's original scope. If the solution can be used for
other devices that's great too. I believe that the current multi-context
patch series is a good fit for codecs. If we broaden the scope too much
right away we'll achieve nothing.

> >> I have never been very enthusiastic about the m2m framework: it's fine for e.g.
> >> simple scalers, but it's awkward to use for codecs let alone ISPs.
> >>
> >> I always felt that we really need variants of the m2m framework that are customized
> >> to specific use-cases: i.e. a codec m2m framework, and (perhaps) an ISP m2m framework.
> >>
> >> The big problem with that is of course who will do the work. Making new frameworks
> >> is difficult and takes a long time.
> 
> This may be naive and overly optimistic, but I feel there is quite a
> number of people sharing the same pain points (which are similar to
> those Loic pointed out). Maybe (hopefully) this birds of a feather
> session leads to the formation of some work group?
> 
> >>>>>> On Sun, Apr 12, 2026 at 12:25 PM Hans Verkuil wrote:
> >>>>>>>
> >>>>>>> (Please pass this on to anyone you think might be interested in this!)
> >>>>>>>
> >>>>>>> Hi all,
> >>>>>>>
> >>>>>>> This is the fourth version of this announcement, updating the list of attendees
> >>>>>>> and the tentative agenda at the end: please let me know if you see mistakes.
> >>>>>>> Note that there is still time for one or two other topics. Also please check
> >>>>>>> the agenda if you need more (or perhaps less) time for your topic.
> >>>>>>>
> >>>>>>> This year's Media Summit will be held on Tuesday May 26th the day before the
> >>>>>>> Embedded Recipes Conference in Nice, France:
> >>>>>>>
> >>>>>>> https://embedded-recipes.org/2026/
> >>>>>>>
> >>>>>>> The Media Summit will be held at Hotel Campanile and in the same meeting room
> >>>>>>> as last year (Nikaia):
> >>>>>>>
> >>>>>>> https://nice-aeroport.campanile.com/en-us/
> >>>>>>>
> >>>>>>> It is close to the Airport and to the Embedded Recipes venue.
> >>>>>>>
> >>>>>>> The meeting room can hold up to 30 people and I will provide video conferencing support,
> >>>>>>> just like last year. The location and the meeting room was quite nice last year, so
> >>>>>>> I saw no need to change it.
> >>>>>>>
> >>>>>>> That said, in-person participation is very much preferred. This yearly summit is meant
> >>>>>>> for active media developers to meet face-to-face and to discuss media subsystem issues.
> >>>>>>>
> >>>>>>> And it is also a good opportunity to talk to each other during the Embedded Recipes
> >>>>>>> conference to discuss topics in a smaller group. But if you are an active media developer
> >>>>>>> and are really not able to attend in person, then remote participation is an option.
> >>>>>>>
> >>>>>>> If you want to attend the meeting (either in person or remote), then send an email to me
> >>>>>>> directly. The deadline for in-person attendance is May 14 as the hotel needs to know the
> >>>>>>> final number of attendees by then.
> >>>>>>>
> >>>>>>> There is no registration fee, the meeting room is sponsored by Cisco and Collabora, and
> >>>>>>> the lunch is sponsored by Ideas on Board! Many thanks to our sponsors, it's very much
> >>>>>>> appreciated.
> >>>>>>>
> >>>>>>> If you have a topic that you want to discuss, just 'Reply All' to this announcement
> >>>>>>> and give the topic title, a short description and a guesstimate of the time you need
> >>>>>>> for your topic.
> >>>>>>>
> >>>>>>> See last year's Media Summit Report as an example of what to expect:
> >>>>>>>
> >>>>>>> https://lore.kernel.org/linux-media/21769183-ca57-4f8f-818a-6a1ad089298d@jjverkuil.nl/
> >>>>>>>
> >>>>>>> Regards,
> >>>>>>>
> >>>>>>>         Hans
> >>>>>>>
> >>>>>>> PS: Be aware that May 24 and 25 are public holidays in France. So many
> >>>>>>> shops may be
> >>>>>>> closed those days.
> >>>>>>>
> >>>>>>> In-person attendees:
> >>>>>>> Sakari Ailus <sakari.ailus@linux.intel.com>
> >>>>>>> Kieran Bingham <kieran.bingham@ideasonboard.com>
> >>>>>>> Brandon Brnich <b-brnich@ti.com>
> >>>>>>> Rouven Czerwinski <rouven.czerwinski@linaro.org>
> >>>>>>> Mehdi Djait <mehdi.djait@linux.intel.com>
> >>>>>>> Bryan O'Donoghue <bryan.odonoghue@linaro.org>
> >>>>>>> Nicolas Dufresne <nicolas.dufresne@collabora.com>
> >>>>>>> Marco Felsch <m.felsch@pengutronix.de>
> >>>>>>> Paul Kocialkowski <paulk@sys-base.io>
> >>>>>>> Jai Luthra <jai.luthra@ideasonboard.com>
> >>>>>>> Jacopo Mondi <jacopo.mondi@ideasonboard.com>
> >>>>>>> Benjamin Mugnier <benjamin.mugnier@foss.st.com>
> >>>>>>> Beleswar Padhi <b-padhi@ti.com>
> >>>>>>> Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> >>>>>>> Loic Poulain <loic.poulain@oss.qualcomm.com>
> >>>>>>> Sven Püschel <s.pueschel@pengutronix.de>
> >>>>>>> Ricardo Ribalda <ribalda@chromium.org>
> >>>>>>> Michael Riesch <michael.riesch@collabora.com>
> >>>>>>> Devarsh Thakkar <devarsht@ti.com>
> >>>>>>> Michael Tretter <m.tretter@pengutronix.de>
> >>>>>>> Hans Verkuil <hverkuil@kernel.org>
> >>>>>>>
> >>>>>>> Remote attendees:
> >>>>>>> Yemike Abhilash Chandra <y-abhilashchandra@ti.com>
> >>>>>>> Rishikesh Donadkar <r-donadkar@ti.com>
> >>>>>>> Jackson Lee <jackson.lee@chipsnmedia.com>
> >>>>>>> Dave Stevenson <dave.stevenson@raspberrypi.com> (tentative)
> >>>>>>>
> >>>>>>>
> >>>>>>> Agenda (tentative):
> >>>>>>>
> >>>>>>> 8:45-9:20: Arrive, settle in
> >>>>>>>
> >>>>>>> 9:20-9:30: Short intro (Hans Verkuil)
> >>>>>>>
> >>>>>>> 9:30-9:45: Status of ISP support in V4L2
> >>>>>>>         Presenter: Laurent Pinchart
> >>>>>>>         Description: Summary of ISP-related development in V4L2 since the last
> >>>>>>>         Linux Media Summit. This includes a brief overview of technical
> >>>>>>>         developments, and a summary of the efforts to engage with vendors.
> >>>>>>>
> >>>>>>> 9:45-10:45: V4L2 Stateless Video Encoding uAPI Progress Update
> >>>>>>>         Presenter: Paul Kocialkowski
> >>>>>>>         Description: An update on the ongonig work to support stateless codecs in V4L2.
> >>>>>>>         Some of the remaining open topics will be presented and discussed.
> >>>>>>>
> >>>>>>> 10:45-11:00: break
> >>>>>>>
> >>>>>>> 11:00-11:30: Vulkan Video Codecs
> >>>>>>>         Presenter: Nicolas Dufresne
> >>>>>>>         Description: Vulkan video codecs: what are the viable options for Linux Media
> >>>>>>>         and what is in preparation outside of our subsystem. The second aspect is
> >>>>>>>         informative as these discussions don't seem to lean toward our subsystem as the
> >>>>>>>         foundation. But I think it's rather useful for everyone to understand why and
> >>>>>>>         what is included.
> >>>>>>>
> >>>>>>> 11:30-12:00: Protected Video playback on i.MX8MQ
> >>>>>>>         Presenter: Rouven Czerwinski
> >>>>>>>         Description: Introduction to protected video playback
> >>>>>>>         on i.MX8MQ and missing bits for linux-media & protected heap interoperability.
> >>>>>>>
> >>>>>>> 12:00-13:30: Lunch
> >>>>>>>
> >>>>>>> 13:30-14:00: HDCP support for HDMI receivers
> >>>>>>>         Presenter: Hans Verkuil
> >>>>>>>         Description: I have been working on adding HDCP support for HDMI receivers.
> >>>>>>>         Specifically the HDCP negotiation between sources and sinks.
> >>>>>>>
> >>>>>>> 14:00-14:30: AI patches
> >>>>>>>         Presenter: Sakari Ailus
> >>>>>>>         Description: What is our policy w.r.t. AI generated patches?
> >>>>>>>
> >>>>>>> 14:30-15:00 Overview of Media CI: where do pipelines run?
> >>>>>>>         Presenter: Ricardo Ribalda
> >>>>>>>         Description: How are jobs in pipelines assigned? How does the infrastructure
> >>>>>>>         for Media CI work? Are there things that can be tweaked to make it more
> >>>>>>>         reliable?
> >>>>>>>
> >>>>>>> 15:00-15:15: Break
> >>>>>>>
> >>>>>>> 15:15-16:15: Discussion of the media subsystem development process
> >>>>>>>         Presenter: Hans Verkuil
> >>>>>>>         Description: Review of the multi-committer model: current status and next steps.
> >>>>>>>         Are there any bottlenecks, any ideas for improvements, w.r.t. the development process?
> >>>>>>>
> >>>>>>> As you can see, there is still some available time for other topics.

-- 
Regards,

Laurent Pinchart