Re: Media summit at the Kernel Summit - was: Fwd: Re: [Ksummit-2012-discuss] Organising Mini Summits within the Kernel Summit
Hi Hans, On Tuesday 17 July 2012 21:32:22 Hans Verkuil wrote: > On Tue July 17 2012 19:30:53 Mauro Carvalho Chehab wrote: > > As we did in 2012, we're planning to do a media summit again at KS/2012. > > > > The KS/2012 will happen in San Diego, CA, US, between Aug 26-28, just > > before the LinuxCon North America. > > > > In order to do it, I'd like to know who is interested on participate, > > and to get proposals about what subjects will be discussed there, > > in order to start planning the agenda. > > I'd like to have 30 minutes to discuss a few V4L2 API ambiguities or just > plain weirdness, just like I did last year. Another ambiguity for your list, should video output drivers fill the sequence and timestamp fields when returning a v4l2_buffer from VIDIOC_DQBUF ? -- Regards, Laurent Pinchart -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: Media summit at the Kernel Summit - was: Fwd: Re: [Ksummit-2012-discuss] Organising Mini Summits within the Kernel Summit
On Tue, Jul 24, 2012 at 5:50 PM, Antti Palosaari wrote: > I wonder if it is wise to merge both DVB and V4L2 APIs, add needed DVB stuff > to V4L2 API and finally remove whole DVB API. V4L2 API seems to be much more > feature rich, developed more actively and maybe has less problems than > current DVB API. This may just be a case of "the grass is always greener on the other side of the fence". The V4L2 subsystem has more than it's share of problems - you just don't see them since you don't work with that code on a regular basis. Devin -- Devin J. Heitmueller - Kernel Labs http://www.kernellabs.com -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: Media summit at the Kernel Summit - was: Fwd: Re: [Ksummit-2012-discuss] Organising Mini Summits within the Kernel Summit
On 07/24/2012 11:11 PM, Devin Heitmueller wrote: On Tue, Jul 24, 2012 at 4:05 PM, Rémi Denis-Courmont wrote: If it's of interest to anyone, I could probably present a bunch of issues with V4L2 and DVB from userspace perspective. Remi, I would strongly be in favor of this. One thing that we get far to little of is feedback from actual userland developers making use of the V4L and DVB interfaces (aside from the SoC vendors, which is a completely different target audience than the traditional V4L and DVB consumers) I wonder if it is wise to merge both DVB and V4L2 APIs, add needed DVB stuff to V4L2 API and finally remove whole DVB API. V4L2 API seems to be much more feature rich, developed more actively and maybe has less problems than current DVB API. regards Antti -- http://palosaari.fi/ -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: Media summit at the Kernel Summit - was: Fwd: Re: [Ksummit-2012-discuss] Organising Mini Summits within the Kernel Summit
Le mardi 24 juillet 2012 23:31:42 Andy Walls, vous avez écrit : > >I would strongly be in favor of this. One thing that we get far to > >little of is feedback from actual userland developers making use of > >the V4L and DVB interfaces (aside from the SoC vendors, which is a > >completely different target audience than the traditional V4L and DVB > >consumers) > > > >Devin > > Ditto. Input from user application developers is something that kernel > developers need and value greatly. > > Note, that I will not be at the workshop of Plumbers this year. :( Is the media summit timed with LPC or the kernel summit? If I come, I have to leave on Thursday to catch the VideoLAN conference in Paris on the next week- end... -- Rémi Denis-Courmont http://www.remlab.net/ http://fi.linkedin.com/in/remidenis -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: Media summit at the Kernel Summit - was: Fwd: Re: [Ksummit-2012-discuss] Organising Mini Summits within the Kernel Summit
Devin Heitmueller wrote: >On Tue, Jul 24, 2012 at 4:05 PM, Rémi Denis-Courmont >wrote: >> If it's of interest to anyone, I could probably present a bunch of >issues with >> V4L2 and DVB from userspace perspective. > >Remi, > >I would strongly be in favor of this. One thing that we get far to >little of is feedback from actual userland developers making use of >the V4L and DVB interfaces (aside from the SoC vendors, which is a >completely different target audience than the traditional V4L and DVB >consumers) > >Devin > >-- >Devin J. Heitmueller - Kernel Labs >http://www.kernellabs.com >-- >To unsubscribe from this list: send the line "unsubscribe linux-media" >in >the body of a message to majord...@vger.kernel.org >More majordomo info at http://vger.kernel.org/majordomo-info.html Ditto. Input from user application developers is something that kernel developers need and value greatly. Note, that I will not be at the workshop of Plumbers this year. :( Regards, Andy -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: Media summit at the Kernel Summit - was: Fwd: Re: [Ksummit-2012-discuss] Organising Mini Summits within the Kernel Summit
On Tue, Jul 24, 2012 at 4:05 PM, Rémi Denis-Courmont wrote: > If it's of interest to anyone, I could probably present a bunch of issues with > V4L2 and DVB from userspace perspective. Remi, I would strongly be in favor of this. One thing that we get far to little of is feedback from actual userland developers making use of the V4L and DVB interfaces (aside from the SoC vendors, which is a completely different target audience than the traditional V4L and DVB consumers) Devin -- Devin J. Heitmueller - Kernel Labs http://www.kernellabs.com -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: Media summit at the Kernel Summit - was: Fwd: Re: [Ksummit-2012-discuss] Organising Mini Summits within the Kernel Summit
Hello, Le mardi 17 juillet 2012 20:30:53 Mauro Carvalho Chehab, vous avez écrit : > As we did in 2012, we're planning to do a media summit again at KS/2012. > > The KS/2012 will happen in San Diego, CA, US, between Aug 26-28, just > before the LinuxCon North America. > > In order to do it, I'd like to know who is interested on participate, > and to get proposals about what subjects will be discussed there, > in order to start planning the agenda. If it's of interest to anyone, I could probably present a bunch of issues with V4L2 and DVB from userspace perspective. Regards, -- Rémi Denis-Courmont http://www.remlab.net/ http://fi.linkedin.com/in/remidenis -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: Media summit at the Kernel Summit - was: Fwd: Re: [Ksummit-2012-discuss] Organising Mini Summits within the Kernel Summit
On Sat July 21 2012 14:16:22 Sylwester Nawrocki wrote: > Hi Hans, > > On 07/17/2012 09:32 PM, Hans Verkuil wrote: > > On Tue July 17 2012 19:30:53 Mauro Carvalho Chehab wrote: > >> As we did in 2012, we're planning to do a media summit again at KS/2012. > >> > >> The KS/2012 will happen in San Diego, CA, US, between Aug 26-28, just > >> before the LinuxCon North America. > >> > >> In order to do it, I'd like to know who is interested on participate, > >> and to get proposals about what subjects will be discussed there, > >> in order to start planning the agenda. > > > > I'd like to have 30 minutes to discuss a few V4L2 API ambiguities or just > > plain weirdness, just like I did last year. I'll make an RFC issues to > > discuss > > beforehand. I might also have a short presentation/demo of v4l2-compliance, > > as > > I believe more people need to know about that utility. > > What do you think about adding new M2M capability flag for memory-to-memory > video devices ? I prepared an RFC patch for that already: > http://www.mail-archive.com/linux-media@vger.kernel.org/msg48497.html > > I think that at least qualifies to your list of V4L2 API ambiguities, even > though we have device_caps now. Using ORed OUTPUT and CAPTURE flags implies > all existing applications must check now both flags when they're trying to > discover a video capture or video output device. I agree. I've added to my list (which is getting pretty long BTW, I will probably need more than 30 minutes). When adding support for M2M devices to v4l2-compliance I also noticed that using CAPTURE+OUTPUT is a rather awkward way to signal this capability, so I agree to adding a special cap bit for that. Regards, Hans -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: Media summit at the Kernel Summit - was: Fwd: Re: [Ksummit-2012-discuss] Organising Mini Summits within the Kernel Summit
Hi Hans, On 07/17/2012 09:32 PM, Hans Verkuil wrote: > On Tue July 17 2012 19:30:53 Mauro Carvalho Chehab wrote: >> As we did in 2012, we're planning to do a media summit again at KS/2012. >> >> The KS/2012 will happen in San Diego, CA, US, between Aug 26-28, just >> before the LinuxCon North America. >> >> In order to do it, I'd like to know who is interested on participate, >> and to get proposals about what subjects will be discussed there, >> in order to start planning the agenda. > > I'd like to have 30 minutes to discuss a few V4L2 API ambiguities or just > plain weirdness, just like I did last year. I'll make an RFC issues to discuss > beforehand. I might also have a short presentation/demo of v4l2-compliance, as > I believe more people need to know about that utility. What do you think about adding new M2M capability flag for memory-to-memory video devices ? I prepared an RFC patch for that already: http://www.mail-archive.com/linux-media@vger.kernel.org/msg48497.html I think that at least qualifies to your list of V4L2 API ambiguities, even though we have device_caps now. Using ORed OUTPUT and CAPTURE flags implies all existing applications must check now both flags when they're trying to discover a video capture or video output device. -- Regards, Sylwester -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: Media summit at the Kernel Summit - was: Fwd: Re: [Ksummit-2012-discuss] Organising Mini Summits within the Kernel Summit
Hi Mauro, Great news, please count me in. We are currently building a new ChromeOS graphics/media stack based on V4L2, vb2, dmabuf, DRM and GL. Synchronization/shared resource usage is one important topic for discussion, as well as, depending on interest, perhaps optimizations like CPU cache maintenance, dmabuf hint/caching sglists, sharing mappings between drivers, etc. Perhaps others would also have something to add to this list. Thanks! Pawel Osciak On Tue, Jul 17, 2012 at 10:30 AM, Mauro Carvalho Chehab wrote: > As we did in 2012, we're planning to do a media summit again at KS/2012. > > The KS/2012 will happen in San Diego, CA, US, between Aug 26-28, just > before the LinuxCon North America. > > In order to do it, I'd like to know who is interested on participate, > and to get proposals about what subjects will be discussed there, > in order to start planning the agenda. > > Thanks! > Mauro > > Mensagem original > Assunto: Re: [Ksummit-2012-discuss] Organising Mini Summits within the Kernel > Summit > Data: Fri, 13 Jul 2012 13:37:08 -0400 > De: Theodore Ts'o > Para: James Bottomley > CC: ksummit-2012-disc...@lists.linux-foundation.org, linux-kernel > > > On Wed, Jul 11, 2012 at 09:09:15AM +0100, James Bottomley wrote: >> Hi All, >> >> We have set aside the second day of the kernel summit (Tuesday 28 >> August) as mini-summit day. So far we have only the PCI mini summit on >> this day, so if you can think of other topics, please send them to the >> kernel summit discuss list: >> >> ksummit-2012-disc...@lists.linux-foundation.org >> >> Looking at the available rooms, we think we can run about four or five >> mini summits. >> >> As an added incentive, mini summit organisers get to pick who they >> invite and all the people they pick will get an automatic invitation to >> the third day of the kernel summit (but not the core first day) and the >> evening events. > > OK, so far I believe I've heard concrete suggestions from identified > (or fairly well identified :-) stuckees willing to organize > mini-summits for: > > * ARM > * Media > * PCI > * memcg > > I may have missed some, so if people could send a message to the > discuss list with [MINI-SUMMIT] in the subbject line and the name of > the proposed mini-summit, that would be really helpful. Please > indicate whether you are volunteering to help organize the proposed > mini-summit, or identify someone you think can be volunteered. :-) > > Things that we will be asking the mini-summit chars to determine, in > addition to who should be given invites for Tuesday and Wednesday is > an estimate of how much time you need, and a list of sub-topics (and > who might lead the sub-topic discussion). We will be asking you to > create a fairly well-defined schedule, with 30 and 60 minute slots, so > that we can publish a schedule and so that people who might need to > hop between mini-summits, have a chance to do so. So please start > thinking about how long each of your sub-topics will need to be, and > who might be needed for a particular sub-topic's discussion to be > successful. There may be a number of developers, with fingers in > multiple subsystem, where scheduling may become a bit of a challenge. > > Thanks!! > > - Ted > ___ > Ksummit-2012-discuss mailing list > ksummit-2012-disc...@lists.linux-foundation.org > https://lists.linux-foundation.org/mailman/listinfo/ksummit-2012-discuss > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-media" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Best regards, Pawel Osciak -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: Media summit at the Kernel Summit - was: Fwd: Re: [Ksummit-2012-discuss] Organising Mini Summits within the Kernel Summit
On Tue July 17 2012 19:30:53 Mauro Carvalho Chehab wrote: > As we did in 2012, we're planning to do a media summit again at KS/2012. > > The KS/2012 will happen in San Diego, CA, US, between Aug 26-28, just > before the LinuxCon North America. > > In order to do it, I'd like to know who is interested on participate, > and to get proposals about what subjects will be discussed there, > in order to start planning the agenda. I'd like to have 30 minutes to discuss a few V4L2 API ambiguities or just plain weirdness, just like I did last year. I'll make an RFC issues to discuss beforehand. I might also have a short presentation/demo of v4l2-compliance, as I believe more people need to know about that utility. Regards, Hans > > Thanks! > Mauro > > Mensagem original > Assunto: Re: [Ksummit-2012-discuss] Organising Mini Summits within the Kernel > Summit > Data: Fri, 13 Jul 2012 13:37:08 -0400 > De: Theodore Ts'o > Para: James Bottomley > CC: ksummit-2012-disc...@lists.linux-foundation.org, linux-kernel > > > On Wed, Jul 11, 2012 at 09:09:15AM +0100, James Bottomley wrote: > > Hi All, > > > > We have set aside the second day of the kernel summit (Tuesday 28 > > August) as mini-summit day. So far we have only the PCI mini summit on > > this day, so if you can think of other topics, please send them to the > > kernel summit discuss list: > > > > ksummit-2012-disc...@lists.linux-foundation.org > > > > Looking at the available rooms, we think we can run about four or five > > mini summits. > > > > As an added incentive, mini summit organisers get to pick who they > > invite and all the people they pick will get an automatic invitation to > > the third day of the kernel summit (but not the core first day) and the > > evening events. > > OK, so far I believe I've heard concrete suggestions from identified > (or fairly well identified :-) stuckees willing to organize > mini-summits for: > > * ARM > * Media > * PCI > * memcg > > I may have missed some, so if people could send a message to the > discuss list with [MINI-SUMMIT] in the subbject line and the name of > the proposed mini-summit, that would be really helpful. Please > indicate whether you are volunteering to help organize the proposed > mini-summit, or identify someone you think can be volunteered. :-) > > Things that we will be asking the mini-summit chars to determine, in > addition to who should be given invites for Tuesday and Wednesday is > an estimate of how much time you need, and a list of sub-topics (and > who might lead the sub-topic discussion). We will be asking you to > create a fairly well-defined schedule, with 30 and 60 minute slots, so > that we can publish a schedule and so that people who might need to > hop between mini-summits, have a chance to do so. So please start > thinking about how long each of your sub-topics will need to be, and > who might be needed for a particular sub-topic's discussion to be > successful. There may be a number of developers, with fingers in > multiple subsystem, where scheduling may become a bit of a challenge. > > Thanks!! > > - Ted > ___ > Ksummit-2012-discuss mailing list > ksummit-2012-disc...@lists.linux-foundation.org > https://lists.linux-foundation.org/mailman/listinfo/ksummit-2012-discuss > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-media" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: Media summit at the Kernel Summit - was: Fwd: Re: [Ksummit-2012-discuss] Organising Mini Summits within the Kernel Summit
> As we did in 2012, we're planning to do a media summit again at KS/2012. Excellent. > The KS/2012 will happen in San Diego, CA, US, between Aug 26-28, just > before the LinuxCon North America. > > In order to do it, I'd like to know who is interested on participate, > and to get proposals about what subjects will be discussed there, > in order to start planning the agenda. I'm interested. I like the idea of some cross-subsystem pollination, talking with the ALSA people for example ... and given that ARM is growing, I'd like to catch up and understand where ARM silicon is heading in terms of embedded video decoding and any support for hardware specific features we may / may not have / need. ... and of course, if we have anyone from Intel then we should be asking if/when their Intel Media SDK (hardware H264 encoding) is going to become a reality, or possibly kickstart that process. -- Steven Toth - Kernel Labs http://www.kernellabs.com -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
