On Fri, 3 Oct 2008, Artem Makhutov wrote: > Better I explain you, what I want to do: Thanks, this is helpful: > According to the specs, the receiver is capable of decoding this formats: > MPEG-4 H.264 MP@xxxx (ISO 14496-10): up to 10 Mbps Sounds like SD video... > MPEG-4 H.264 HP@xxxx (ISO 14496-10): up to 25 Mbps Sounds like HD video... > Microsoft VC-1 MP@HL (WMV9), AP@L3: up to 25 Mbps Sounds like Evil... I would have to look to find out the actual details of each profile and level to see if there might be any incompatibilities that would be obvious to someone who knows the specs by heart, but I am lazy... In general, SD video of decent quality (or, compared to what else is out there, superb quality), is sent over sat in MPEG-2 by ZDF/3sat, especially overnight when Theatre takes a pause, or the ARD Dritte programs at 12110MHz, at up to 10Mbit/sec. I have read that comparable quality H.264 SD video needs about half the bandwidth. In practice, I've seen quoted 2Mbit/sec or so for the few SD channels currently sent in H.264. The rates I've seen quoted for HD video from the UK range from 10Mbit/sec for ITV-HD to 15Mbit/sec for BBC-HD and up to 20Mbit/sec for some Sky UK channels. These are all 1080i (some source material is progressive). > So what I want to do is to fake my providers "IP-TV-Network", as the box is > using HTTP to communicate whis the ISP this should not be the problem. > > And then stream my DVB-S2 / H264 recordings to the IPTV receiver. Sounds interesting. Good luck :-) I don't think you need to worry about broadcast bandwidth. > I am living in Germany, and my satellite dish is setup to Astra 19,2 E. > I did some recording from Arte HD, Astra HD promo and Anixe HD. Another thing to note is that while the UK services I mention use resolution of 1080, many continental broadcasters have for the moment settled on using 720p50 -- although bandwidth should be comparable (also of note is that the transmitted resolution of BBC-HD is currently 1440x1080, so that it needs somewhat less bandwidth than if it were sent 1-to-1 as 1920x1080). A further source of information on bandwidth (that you can also see from your file sizes) would be several internet sat-DX sites which give lots of information about the bandwidth of the audio and video streams at time of sampling. I can't name names off the top of my head which I know give this info, but I've seen the data (which has not always been 100% accurate)... > My PC, Athlon X2 6000+ (2x 3GHz), is too slow to playback the recordings > smoothly. It would be really nice, as soon as there is a way to use the hardware acceleration in today's graphics cards, to offload much of the work from your CPU, the way that X11's XvMC for MPEG-2 helps a few vendors' cards play smoothly on hardware as old and slow as mine (still need to dig up my arte-HD tests from a year or three ago sent as MPEG-2 and try them) ... > > However, in the case of the BBC `Planet Erde' as broadcast, > > the frames I looked at were all identical every two frames, > > Other material which likely originated from the BBC was > > in fact 720p at 50 frames/second -- though it may well > > have been originally recorded at 1080i or 1080p, and > > either up- or downscaled, and to me did not look very > I see, the DVB-Providers are changing the transmission "parameters" during the > stream... hmmm, that's not good. Not really -- certainly they do not change (switch) the parameters during the stream (broadcast) -- but if they have received a master at 1080i, they need to change (convert) it to the 720p which is broadcast. Or it may be that the production is all done in 1080p, and then from this, masters at 1080i and 720p are made to be sold to the various broadcasters. I don't know the details of the production business. In any case, the streams you record will always be Xx720p or Xx1080i, where X is stretched appropriately for display if needed, the way that 720x or 704x576 SD video is stretched to the 16:9 aspect ratio 1024x576. That won't change. > > Boy, do I type a lot. > > > Yes, you do :) And with one finger, other hand holding my beer bottle, in the dark, by the dim glow of my monitor with a black background. that's why i make so many typing errors, sorry barry bouwsma _______________________________________________ linux-dvb mailing list linux-dvb@xxxxxxxxxxx http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
