improving the quality of the video we capture. No question ;) operator training is top of my list.
I think we need a collection of things, the first thing being a designated place where this collection lives. even if it is just a page of links to things. Here are some of my things that I point people to http://dvswitch.alioth.debian.org/wiki/event_volunteer/ http://dvswitch.alioth.debian.org/wiki/conference/ outline of things I try to cover for onsite training https://github.com/CarlFK/veyepar/blob/master/docs/training.txt On Wed, Sep 6, 2017 at 2:18 PM, Andy Simpkins <[email protected]> wrote: > > > On 02/09/17 21:54, Peter 'p2' De Schrijver wrote: > >> On 2017-06-27 19:02:39 (+0300), Peter 'p2' De Schrijver <[email protected]> >> wrote: >> >>> On 2017-06-27 14:01:25 (+0200), Wouter Verhelst <[email protected]> wrote: >>> >>>> On Tue, Jun 27, 2017 at 11:43:55AM +0000, Holger Levsen wrote: >>>> >>>>> On Tue, Jun 27, 2017 at 01:26:37PM +0200, Wouter Verhelst wrote: >>>>> >>>>>> Right, but I doubt we'll ever want to do more than 1080p (if even >>>>>> that), >>>>>> >>>>> I used to say the same about DV ("thats all we need") but after having >>>>> seen several >>>>> cccongress videos in 1080p I must say, higher resolution *is* better. >>>>> >>>>> Both for videos with many small details as well as for "boring videos" >>>>> where you >>>>> only see the speaker??? >>>>> >>>>> So I can imagine doing DebConf videos in 4k by now :) >>>>> >>>> Oh, yeah, sure. I can *imagine*, that's not the problem. Perhaps I >>>> should clarify: >>>> >>>> - I doubt voctomix can deal with 4K on today's hardware; >>>> >>> Nageru might, although I should still try it on a more modern GPU (it >>> runs >>> out of VRAM on my ancient GTX560ti with only 1GB VRAM with a 4k signal, >>> it >>> does 1080p just fine) >>> >>> - Most people will not want to download a one-hour 2160p stream (which >>>> will be >>>> around 35G if done right) if a 1080p one (about 5G) will suffice; >>>> >>> unlimited broadband internet exists for a reason :) >>> >>> - While 4K screens do exist, I don't know how many DDs have such screens >>>> today >>>> (as opposed to FullHD ones); >>>> >>> 4K screens can be had for 300 euro now.. (https://tweakers.net/pricewat >> ch/499457/aoc-u2879vf-zwart.html) >> >> Peter. >> >> _______________________________________________ >> >> Of cause this is a presentation / talk we are refering to here - to be > quite honest there is very little point in streaming (or recording) at > anything higher resolution and quality than the "slides" that we capture. > > Presently we are able to capture slides, up/downscaled to 720p and audio. > Video from our cameras is also at 1080p, of cause if you want to go any > higher then you need more bandwidth between the cameras and the video mixer > than can be achieved over a single SDI link (and the camera only has the > one output). > > Please remember that we are dealing with near raw video into the mixing PC > (regardless of what software it is running) each camera input comes in over > SDI, whilst the slide capture is carried over USB2 and then ethernet as > MJPEG IIRC). > > We then encode the output of our 'live vision mix' for the streams and > separately transcode for recordings (after review). > Streaming can only have a single pass encode process (it is live afterall > so we don't know what is comming up next - this has a massive baring on > encoding). We can, however, take multiple passes for the recordings; this > means that the recorded video can be either a much higher quality or much > smaller file size than the stream for any given bit-rate as the entropy > reduction can be much better. > > And that brings me to my final point in this reply - bandwidth. We > attempt to provide streams out of a debconf for (currently) 3 presentations > at once. Each presentation has 2 live streams - one at a low bandwidth and > the other slightly better. I am not concerned about the distribution > networks ability to handle these 6 streams for multiple viewers, more the > ability to ensure that we are able to get these streams out of the venue > alongside the rest of the conference traffic (remember this is a different > venue each year, and on a network that that we don't get to stress until > the first day!). With that in mind I really must stress that we endeavor > to provide a reliable live stream that is good enough and fit for purpose > over one of higher resolution. > > Instead of going to ever higher and higher resolution (and frame rate) > perhaps we should be concentrating on improving the quality of the video we > capture? > As a team we are working to improve the recordings that we make. This > includes, but is not limited to, improvements in: sound, "slide capture", > review process, infrastructure setup, operator training, encoding and > storage. All of which will have a bigger impact on the quality of > recordings before an increase in resolution. > > Frankly being able to get uniform sound and lighting from each talk (and > across each talk room) in a consistent manor will make a much bigger > impact... > > /Andy > > > > > > > _______________________________________________ > Debconf-video mailing list > [email protected] > http://lists.debconf.org/mailman/listinfo/debconf-video >
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