Re: [ANN] Topics for a media summit in Lyon in October

[Daniel Gomez <daniel@qtec.com>]

Hi,

On Fri, 13 Sep 2019 at 13:27, Hans Verkuil <hverkuil@xs4all.nl> wrote:
>
> On 9/3/19 9:21 AM, Hans Verkuil wrote:
> > Hi all,
> >
> > I've decided to hold the meeting during the ELCE and not on Thursday.
> > Two key people can't be there on Thursday and some travel back Thursday
> > evening and so would have to leave early.
> >
> > Looking at the schedule I propose instead to have one meeting on
> > Tuesday morning concentrating on finalizing the codec support.
> >
> > On Wednesday we have a second meeting for libcamera (morning) and looking
> > at future V4L2 developments such as v4l2_ext_buffer/format, Request API and
> > complex camera pipelines (afternoon).
> >
> > Laurent, it would make sense if you or one of the other libcamera devs is
> > 'chairing' the libcamera meeting. Do you agree? If so, can you prepare an
> > agenda for that meeting?
> >
> > I plan on leaving Thursday afternoon, so we have the option to continue the
> > talks around that last topic on Thursday morning.
> >
> > I have no idea where we will hold these meetings since I've no idea
> > what the conference center looks like and if they have suitable places
> > for doing something like this. So I'll look around on the Monday and
> > mail the details of where to meet then.
>
> Good news: the Linux Foundation found a room for us, for both the Tuesday
> morning (8-12AM) and the whole of Wednesday (8AM-6PM).
>
> The room is: Terreaux VIP Lounge - Level 0
> It's boardroom seating for 15, screen & Projector, 3 power strips on the tables.
>
> Many thanks to the LF for hosting this for us!
>
> Regards,
>
>         Hans
>

I will be in the ELCE for the first time and since I've also started
to work recently with
Ricardo Ribalda and with industrial cameras (v4l2, sensors,
encoders...)  I would love
to attend all the meetings: codecs, libcamera, and V4L2 development.

> >
> > Confirmed attendees:
> >
> > Boris Brezillon <boris.brezillon@collabora.com>
> > Alexandre Courbot <acourbot@chromium.org>
> > Nicolas Dufresne <nicolas@ndufresne.ca>
> > Tomasz Figa <tfiga@chromium.org>
> > Ezequiel Garcia <ezequiel@collabora.com>
> > Eugen Hristev <Eugen.Hristev@microchip.com>
> > Paul Kocialkowski <paul.kocialkowski@bootlin.com>
> > Helen Koike <helen.koike@collabora.com>
> > Jacopo Mondi <jacopo@jmondi.org>
> > Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> > Hans Verkuil <hverkuil@xs4all.nl>
> >
> > If you are not on this list, but want to join, please let me know.
> >
> > Since this is really three half-day meetings, each with a different
> > topic, please let me know which of those half-day meetings you want
> > to attend.
> >
> > Regards,
> >
> >       Hans
> >
> > On 8/28/19 12:55 PM, Hans Verkuil wrote:
> >> On 8/16/19 10:06 AM, Hans Verkuil wrote:
> >>> Rather then discussing topics for a meeting under the subject 'Lisbon'
> >>> let's start a new thread referring to the right place :-)
> >>>
> >>> I will try to organize a room, either during the ELCE or (if that doesn't
> >>> work) perhaps on the Thursday afterwards. If that's going to be a problem
> >>> for someone, please let me know.
> >>
> >> I can only get a room for Thursday afternoon (2pm-6pm). I'm inclined to take
> >> that room, but if a lot of people who want to come, will already have left
> >> on the Thursday, then there is no point in me reserving this room.
> >>
> >> So if you are unable to attend on Thursday, then please let me know asap!
> >>
> >> If Thursday is no problem, then I wanted to have more informal meetings
> >> somewhere in the conference center during the morning, and after lunch
> >> use the room.
> >>
> >> If Thursday is a no-go, then we will just have to find a place inside
> >> the conference center during the ELCE.
> >>
> >> Regards,
> >>
> >>      Hans
> >>
> >>>
> >>> I do need to know how many people I can expect. I have the following
> >>> confirmed attendees (and please reply if you are not listed!):
> >>>
> >>> Alexandre Courbot <acourbot@chromium.org>
> >>> Tomasz Figa <tfiga@chromium.org>
> >>> Jacopo Mondi <jacopo@jmondi.org>
> >>> Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> >>> Hans Verkuil <hverkuil@xs4all.nl>
> >>>
> >>> I know there were more who mentioned on irc that they would attend,
> >>> but it is easier to keep track if I have it in an email.
> >>>
> >>> Topics posted under the previous thread:
> >>>
> >>> Tomasz:
> >>>
> >>> I would want to discuss various v4l2_buffer improvements, e.g.
> >>> - DMA-buf import with plane offsets,
> >>> - unifying the buffer structs for M and non-M formats,
> >>> - ability to import different FDs with offsets for non-M formats if the
> >>> layout matches driver expectations, etc.
> >>>
> >>> Besides that, I would be interested in the general idea on handling
> >>> complex cameras in the Linux kernel in spite of the remaining V4L2
> >>> limitations, e.g.
> >>> - combinatorial explosion of /dev/video nodes,
> >>> - significant ioctl overhead,
> >>> - huge amount of historical legacy making the driver and userspace
> >>> implementations overly difficult and prone to repetitive mistakes,
> >>> - the above also limiting the flexibility of the API - formats, frame
> >>> rates, etc. set using distinct APIs, not covered by Request API, with
> >>> non-failure "negotiation hell", etc.
> >>> - lack of fences, etc.
> >>>
> >>> Jacopo:
> >>>
> >>> Apart from discussing libcamera and hope we could kickstart a review of
> >>> its API, I would like to re-start discussing multiplexed stream support,
> >>> but that would require Sakari to be there, something I'm not certain
> >>> about. Sakari?
> >>>
> >>> Alexandre:
> >>>
> >>> If Collabora/Bootlin is there, I'd certainly want to discuss stateless
> >>> codecs, in particular m2m codec helpers and finalize the specification
> >>> in general.
> >>>
> >>> Regards,
> >>>
> >>>     Hans
> >>>
> >>
> >
>
Regards,
Daniel