From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 52929145355 for ; Tue, 14 Apr 2026 07:42:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=213.167.242.64 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776152558; cv=none; b=tOatB2gTAc7hzbXhtnYeSjX4ulKmZRniCGhNBF81+JhAtJ6SPbpYUNJrSRY7RnORYC9ilZhL1isPRBMWIc/5LuratizNLwbQ07Ta0b4yceiQXPtqsjbEaLx7elVZ/nCRugoKUZgmn2lLo3QP6GFS8VcCQOmJ04lR9zKZG+G6tjw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776152558; c=relaxed/simple; bh=u+QnU2S8POgK8jTj3rGAUTUbNUWcCV/+HSAgKLAAXSs=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=T1qTJVNqE6DQgn2g3uYJTQoPwxPjcKxqxq0gDXACaJdvWlVOVqGWPBjc+6XpOI+Ftgbh/Ej3gGDvDnUVX1L5fSqJBRGBxy4Iv5slfnKrBNV5Vp/Re7hinODKt9blcJHzr8aqmDvH/j45tExCC/s7hHyxsEJmmstJ6ZAtNJuB64Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=ideasonboard.com; spf=pass smtp.mailfrom=ideasonboard.com; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b=qouUgnN0; arc=none smtp.client-ip=213.167.242.64 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="qouUgnN0" Received: from killaraus.ideasonboard.com (2001-14ba-703d-e500--2a1.rev.dnainternet.fi [IPv6:2001:14ba:703d:e500::2a1]) by perceval.ideasonboard.com (Postfix) with UTF8SMTPSA id A6303225; Tue, 14 Apr 2026 09:40:59 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1776152459; bh=u+QnU2S8POgK8jTj3rGAUTUbNUWcCV/+HSAgKLAAXSs=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=qouUgnN0gH265Y43WLzWWOAsKzjcL1vSntB1W5cfMZAS4Pn+MqMG55v3X0DnUVNXt t7el8zvF0Ctb9tYsEz3upgPi6DwSO+R7A/4/+kmqy1UmzMq0RFFtD+4qFZEUiQ2FJ5 4DkvaTn6WCPAreS5NUJLHCAvBLUBn8AyAdO6ehIc= Date: Tue, 14 Apr 2026 10:42:30 +0300 From: Laurent Pinchart To: Michael Riesch Cc: Ricardo Ribalda , Hans Verkuil , Nicolas Dufresne , Loic Poulain , Linux Media Mailing List , Mauro Carvalho Chehab , Sean Young , Sakari Ailus , Jacopo Mondi , Niklas =?utf-8?Q?S=C3=B6derlund?= , Tomi Valkeinen , Alain Volmat , Bryan O'Donoghue , Dave Stevenson , Daniel Almeida , Michael Tretter , Tomasz Figa , Steve Cho , Kieran Bingham , Kevin Hilman , Paul Kocialkowski , Benjamin Mugnier , Hans de Goede , Maxime Ripard , Brandon Brnich , Marco Felsch , Sven =?utf-8?Q?P=C3=BCschel?= , Devarsh Thakkar , Yemike Abhilash Chandra , Jackson Lee , Jai Luthra , Mehdi Djait , "Padhi, Beleswar" , "Donadkar, Rishikesh" , Rouven Czerwinski Subject: Re: [ANNv4] Media Summit on May 26th in Nice, France Message-ID: <20260414074230.GB4061@killaraus.ideasonboard.com> References: <0f95419b-93c1-4c4f-873b-43bd2a9853f7@kernel.org> <20260413201907.GD4034@killaraus.ideasonboard.com> <20260413211602.GE4034@killaraus.ideasonboard.com> <420e20b3-4264-4ab0-bb50-1ae60f6c837a@collabora.com> Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <420e20b3-4264-4ab0-bb50-1ae60f6c837a@collabora.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 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 > >>>>>>> Kieran Bingham > >>>>>>> Brandon Brnich > >>>>>>> Rouven Czerwinski > >>>>>>> Mehdi Djait > >>>>>>> Bryan O'Donoghue > >>>>>>> Nicolas Dufresne > >>>>>>> Marco Felsch > >>>>>>> Paul Kocialkowski > >>>>>>> Jai Luthra > >>>>>>> Jacopo Mondi > >>>>>>> Benjamin Mugnier > >>>>>>> Beleswar Padhi > >>>>>>> Laurent Pinchart > >>>>>>> Loic Poulain > >>>>>>> Sven Püschel > >>>>>>> Ricardo Ribalda > >>>>>>> Michael Riesch > >>>>>>> Devarsh Thakkar > >>>>>>> Michael Tretter > >>>>>>> Hans Verkuil > >>>>>>> > >>>>>>> Remote attendees: > >>>>>>> Yemike Abhilash Chandra > >>>>>>> Rishikesh Donadkar > >>>>>>> Jackson Lee > >>>>>>> Dave Stevenson (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