Re: [backstage] What is TV?
--- On Wed, 30/12/09, Brian Butterworth wrote: > Why the Flash iPlayer client can't use the > hardware acceleration. I get lots of dropped frames > watching through the iPlayer Desktop. The new Flash 10.1 beta uses DXVA (DirectX Hardware Video Acceleration). However it has problems with scaling right now. The main reason they didn't do this earlier is because of paranoia about buggy video drivers causing crashes and potential security issues. This is windows-only right now (presumably because Apple won't give Adobe access to the necessary APIs). When DXVA goes into the main player, iPlayer should be able to improve their HD encoding parameters (e.g. turning CABAC on, more reference frames etc.) However I doubt this will happen because the streams might well end up looking better than the broadcast albeit only at 25p. - Sent via the backstage.bbc.co.uk discussion group. To unsubscribe, please visit http://backstage.bbc.co.uk/archives/2005/01/mailing_list.html. Unofficial list archive: http://www.mail-archive.com/backstage@lists.bbc.co.uk/
Re: [backstage] What is TV?
A tv is box of electronics that is going to the Council dump today - replaced by an iMac and a Freeview dongle (with two UHF tuners). TV and Radio are broadcast media. They exist inside a regulatory framework, and date back to the work of Marconi, Tesla, Hertz and others. Amateur radio still exists, but like broadcast TV and radio it is being knocked sideways by the Internet . 73 de Gordo - Sent via the backstage.bbc.co.uk discussion group. To unsubscribe, please visit http://backstage.bbc.co.uk/archives/2005/01/mailing_list.html. Unofficial list archive: http://www.mail-archive.com/backstage@lists.bbc.co.uk/
Re: [backstage] What is TV?
On Thu, Dec 31, 2009 at 10:11, Kieran Kunhya wrote: > This is windows-only right now (presumably because Apple won't give Adobe > access to the necessary APIs). Er, what? Where did that presumption come from? Nothing else on the Mac or Linux has a problem with video compositing. VLC, which does it entirely in software too, has _no_ issues. Quartz, QuickTime, and OpenGL, which can be hardware-accelerated, are thoroughly documented. Flash’s terrible performance is pretty much entirely Adobe’s problem. M. - Sent via the backstage.bbc.co.uk discussion group. To unsubscribe, please visit http://backstage.bbc.co.uk/archives/2005/01/mailing_list.html. Unofficial list archive: http://www.mail-archive.com/backstage@lists.bbc.co.uk/
[backstage] BBC iPlayer and the Nokia N900
Hi, Nokia have released the Nokia N900 phone based on their Maemo operating system. As it doesn't support S60 WRT that the current Nokia phones iPlayer app is written in is there anyway i can access the iPlayer videos directly. I can access the current videos and play them, but they are unwatchable as the phone can't handle them. This might be due to the standard streams using the VP6 codec, although i haven't been able to confirm this. The specs are: * Firefox Mobile browser * Flash 9.4 * Maemo OS based on Debian with ARM processor * User Agent "Mozilla/5.0 (X11; U; Linux armv7l; en-GB; rv:1.9.2a1pre) Gecko/20090928 Firefox/3.5 Maemo Browser 1.4.1.21 RX-51 N900" Is there a work around to get iPlayer working on this phone and videos watchable? Thanks Adam - Sent via the backstage.bbc.co.uk discussion group. To unsubscribe, please visit http://backstage.bbc.co.uk/archives/2005/01/mailing_list.html. Unofficial list archive: http://www.mail-archive.com/backstage@lists.bbc.co.uk/
Re: [backstage] What is TV?
> > This is windows-only right now (presumably because > Apple won't give Adobe access to the necessary APIs). > > Er, what? Where did that presumption come from? > > Nothing else on the Mac or Linux has a problem with video > compositing. > VLC, which does it entirely in software too, has _no_ > issues. Quartz, > QuickTime, and OpenGL, which can be hardware-accelerated, > are > thoroughly documented. GPU vendor agnostic H.264 bitstream decoding on Macs is only possible with Quicktime - there is no public API for H.264 bitstreaming as far as I know. Such a thing is not possible with Linux. (There are only separate vendor APIs on Linux such as VDPAU) Compositing is done on the GPU in VLC (as part of whatever renderer VLC uses - VMR9 on windows if I recall correctly) whereas in Flash it's a slow software based YV12->RGB conversion in order for overlaying text/graphics amongst other things. Also various issues with running inside a browser window slow it down. - Sent via the backstage.bbc.co.uk discussion group. To unsubscribe, please visit http://backstage.bbc.co.uk/archives/2005/01/mailing_list.html. Unofficial list archive: http://www.mail-archive.com/backstage@lists.bbc.co.uk/
Re: [backstage] BBC iPlayer and the Nokia N900
Adam wrote: Hi, Nokia have released the Nokia N900 phone based on their Maemo operating system. As it doesn't support S60 WRT that the current Nokia phones iPlayer app is written in is there anyway i can access the iPlayer videos directly. I can access the current videos and play them, but they are unwatchable as the phone can't handle them. This might be due to the standard streams using the VP6 codec, although i haven't been able to confirm this. The specs are: * Firefox Mobile browser * Flash 9.4 * Maemo OS based on Debian with ARM processor * User Agent "Mozilla/5.0 (X11; U; Linux armv7l; en-GB; rv:1.9.2a1pre) Gecko/20090928 Firefox/3.5 Maemo Browser 1.4.1.21 RX-51 N900" Is there a work around to get iPlayer working on this phone and videos watchable? I have been using the silly workaround of get_iplayer on my desktop, then transcoding the files. mplayer on the device will actually - just - cope with the flash - with appropriate switches - mplayer -vfm ffmpeg -lavdopts skiploopfilt =all Top_Gear_Series_14_-_Episode_1_b00p1lgb_default.flv The 'proper' flash player is laughably slower though. Flash slowness is pretty much my only annoyance with the device. Other than the cheap gits only including one stylus. You can of course run get_iplayer and transcode on the device itself, but that's not very fast :) - Sent via the backstage.bbc.co.uk discussion group. To unsubscribe, please visit http://backstage.bbc.co.uk/archives/2005/01/mailing_list.html. Unofficial list archive: http://www.mail-archive.com/backstage@lists.bbc.co.uk/
Re: [backstage] BBC iPlayer and the Nokia N900
Adam wrote: Nokia have released the Nokia N900 phone based on their Maemo operating system. As it doesn't support S60 WRT that the current Nokia phones iPlayer app is written in is there anyway i can access the iPlayer videos directly. I can access the current videos and play them, but they are unwatchable as the phone can't handle them. This might be due to the standard streams using the VP6 codec, although i haven't been able to confirm this. The specs are: * Firefox Mobile browser * Flash 9.4 * Maemo OS based on Debian with ARM processor * User Agent "Mozilla/5.0 (X11; U; Linux armv7l; en-GB; rv:1.9.2a1pre) Gecko/20090928 Firefox/3.5 Maemo Browser 1.4.1.21 RX-51 N900" Is there a work around to get iPlayer working on this phone and videos watchable? I've had a n900 for about a month now and I've been thinking about this quite a lot recently. The device is quite capable of playing h.264 at iplayer quality. I've been able to get it to play some HD stuff, and I'll try some iplayer quality stuff at some point. The hardware is certainly able to render good quality ogg+vorbis+theora/mpeg4+h264+aac fine. Watching flash iplayer with the device fundamentally works - the controls work - you can do full screen etc. However you only get one frame every two seconds due to flash being exceedingly heavy on the processor as opposed to native gstreamer video stuff. I don't really think it's the VP6 codec *per se* being the issue, but more the VP6 *flash player* bit. Unfortunately, I've been really busy lately but I keep meaning to knock together an iPlayer viewer with get_iplayer for the N900, perhaps by modifying one of the Maemo h264 youtube video viewers. The N900 was born for this sort of media consumption and it seems a shame that it is being prevented from doing it. I find it mildly ironic how back in the old days of "the iPlayer flamewars", it was suggested initially that GNU/Linux was pretty much irrelevant and then subsequently that the Adobe stack would solve the cross platform compatibility issue. With a growing number of smartphone operating systems running GNU/Linux in some form (Android, Maemo, LiMo, WebOS etc.) and the number of smartphones not supporting flash (iPhoneOS), or not having the power to play anything in flash more intensive than Youtube eg. iPlayer (Every mobile OS that supports Adobe Flash?), I'm not sure that GNU/Linux is largely irrelevant or that Adobe is the answer. Hopefully the next iteration will take a common sense approach because the iPlayer concept really rocks. :) Have a great new year! Tim - Sent via the backstage.bbc.co.uk discussion group. To unsubscribe, please visit http://backstage.bbc.co.uk/archives/2005/01/mailing_list.html. Unofficial list archive: http://www.mail-archive.com/backstage@lists.bbc.co.uk/
Re: [backstage] BBC iPlayer and the Nokia N900
2010/1/1 Tim Dobson : > it was suggested initially that GNU/Linux was pretty much irrelevant Only by ignorant assholes. :-) - Sent via the backstage.bbc.co.uk discussion group. To unsubscribe, please visit http://backstage.bbc.co.uk/archives/2005/01/mailing_list.html. Unofficial list archive: http://www.mail-archive.com/backstage@lists.bbc.co.uk/
