media-workshop September 2014

media-workshop@linuxtv.org

10 participants
5 discussions

[ANN] First tentative agenda
by Hans Verkuil 13 Oct '14

13 Oct '14

Hi all, I have collected all suggested topics. If I missed any, then let me know. There seem to be three groups of topics: one has general topics, one is related to the compound controls, per frame configuration and Android, and one topic is about complex video pipelines. Note that there are currently no DVB topics at all. I have grouped the suggestions into those three high-level topics. If you disagree with where I put it, then let me know. Also let me know your estimate of how long you think the discussion will take. I know it can be hard to pick a time, but it tends to average out anyway. If you put up a topic, then you are expected to prepare for it, either by making a small presentation, or at least to think about what you want to say. We have only two days and I don't want to waste any time. Speaking for myself: on one of the two days I have to give a lightning talk in the gstreamer conference and I want to attend Nicolas' gstreamer presentation as well. I don't know the times and dates yet. If you have suggested a topic and you also have specific times you won't be available, then let me know as soon as you have the details. The plan is to start each day at 9 am and go on to 5 pm or so, depending on how things work out. Regards, Hans ============= General Topics ================== Hans Verkuil: - A presentation on colorspaces (Do *you* know what to put in the v4l2_pix_format colorspace field? And why should it matter?) 30 min - media development process: what works, what doesn't 10-15 min Ricardo: - multiple timestamps per buffer ============== Per-frame configuration/camera HAL v3/Compound control types ============ Ricardo: - multi selections and dead pixel api Hans Verkuil: - update on configure stores for the control framework 15 min Sakari: - Android camera HAL API v3 and what kind of requirements it brings to V4L2. Pawel: - Existing codec API ambiguities (does this belong to this topic?) - A proposal for a new codec API extension/mode for HW codecs that can't parse elementary streams Guennadi: - camera support in Android (does this belong to this topic?) =========== Complex video pipeline drivers topic =================== Hans Verkuil: - create virtual complex omap3-like driver: what is needed 15 min Laurent & Chris Kohn: - runtime reconfiguration of pipelines Philip Zabel: - Helping userspace to use mem2mem devices; clarification of encoder/decoder handling, clarification of format/size setting in case of dependencies between input and output formats, possibly broad categorisation of mem2mem devices (encoder, decoder, scaler, rotator, csc/filter, ...) - Hierarchical media devices - what if you have a lot of media entities and some of them are more closely related to each other than others. Julien Beraud: -Highly reconfigureable hardware devices and the possibility to create media-links and virtual subdevices in order to simplify userland vision. Nicolas Dufresne: - I'll like to discuss frame size enumeration for scaling m2m (e.g. fimc/gscaler and CUDA decoder).

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participation to the mini-media summit
by Julien BERAUD 18 Sep '14

18 Sep '14

Hi, I'd like to attend the Linux Kernel Media mini-summit in Germany. What I'd like to discuss is : -Highly reconfigureable hardware devices and the possibility to create media-links and virtual subdevices in order to simplify userland vision. Regards, Julien BERAUD

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Will prepare the draft agenda next week
by Hans Verkuil 18 Sep '14

18 Sep '14

All proposals have been collected and I plan on making a first draft for the agenda some time next week. Just so you know that they haven't disappeared in a black hole or anything. It looks like it will be a full house, so that's going to be good. Regards, Hans

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[ANNOUNCE] Linux Kernel Media mini-summit on Oct, 16-17 in Düsseldorf, Germany
by Mauro Carvalho Chehab 18 Sep '14

18 Sep '14

Hi, As there are still too things to be discussed in order to improve media stuff, and most of the developers nowadays are located in Europe and usually go to ELCE, we're scheduling a two day mini-summit in Düsseldorf, Germany, on Thrusday/Friday. There is a perfect opportunity to discuss the media Kernel-Userspace API improvements that are required for newer devices to work. So, we hope to have there the major Kernel contributors to the media subsystem, and some people working on userspace, in order to be sure that we'll match the needs required on userspace. In order to properly organize the event, I need the name of the developers interested on joining us, plus the themes proposed for discussions. As usual, we'll be using the media-workshop(a)linuxtv.org ML for specific discussions about that, so the ones interested on participate are requested to subscribe it. Thanks! Mauro

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Topic: create virtual complex video driver
by Hans Verkuil 15 Sep '14

15 Sep '14

With vivid we have a good test driver for all the common V4L2 APIs, but we are missing a test driver for complex pipelines, similar to say the omap3 driver. During the workshop I want to discuss which features should be supported by such a driver. I think such a driver will help testing applications without requiring access to hard-to-find hardware, and it can function as a base for testing new features/APIs. Regards, Hans

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media-workshop September 2014