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

Hans Verkuil
2026-04-14T06:47:48Z

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.
>>>
>>> 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.

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.

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.

Regards,

Hans

>
>>>> 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.
>