Re: [FFmpeg-user] Using ffmpeg to stream IS desktop.
I really appreciate the advice. I am most certainly a "follower" in this realm. I am a firm believer though that, "Where others go, I can follow"... My hunch is that the aggregation will be the easier part. It is the need to get multiple mobile devices to work. So it is the IOS transmitter side that seems to be hard. I know that if I can use VLC to stream the desktop, then we can do it with a custom ffmpeg build. That being said, I am confident that Chromebooks, Android, Windows and almost every other OS will allow VLC/ffmpeg to record the screen and therefore stream it to the rtmp aggregation server. My big problem, I believe is IOS. How can I capture an IOS screen so that I can then send it to the aggregator? Again, we have devised the system that works (a hardware HDMI transmitter), and it is really easy. It is just really ugly (3 or 4 parts), and we don't have the means to make the transmitter small enough to be useable. Thanks for the help! Dave On Sun, Dec 20, 2015 at 7:54 PM, a...@fumatic.org wrote: > would it not be easier to use an rtmp server to "aggregate" and have the > students stream their desktops to it? > > ----- Reply message - > From: "David Peterson" > To: "FFmpeg user questions" > Subject: [FFmpeg-user] Using ffmpeg to stream IS desktop. > Date: Sun, Dec 20, 2015 5:57 PM > > Thank you. I have found some documentation with regards to this. I was > wondering though, if there might be some example howto's on this. My goal, > in our school is to build a way to allow several concurrent mobile devices > which include iPads to be able to cast their screens to an "aggregator" PC > and show them on the overhead projector, kind of like a multiview screen > for multiple camera's. We have devised a way using HDMI grabber cards, and > wireless access points with modified firmware and a USB port, to be able to > send their screen in the manner I have outlined, but I was hoping there was > some way to do it without hardware. > The hardware solution is really cool aside from the fact that their are 3 > or 4 parts to the transmitter. > > Dave > > On Sun, Dec 20, 2015 at 2:44 PM, Carl Eugen Hoyos > wrote: > > > dpeterson478 gmail.com> writes: > > > > > Does anyone know if there are any ports of FFmpeg that > > > have any hope of streaming or recording an iOS desktop? > > > > Does avfoundation not work on iOS? > > I thought it does... > > > > Carl Eugen > > > > ___ > > ffmpeg-user mailing list > > ffmpeg-user@ffmpeg.org > > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > > > ___ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > ___ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
Re: [FFmpeg-user] Using ffmpeg to stream IS desktop.
Thank you. I have found some documentation with regards to this. I was wondering though, if there might be some example howto's on this. My goal, in our school is to build a way to allow several concurrent mobile devices which include iPads to be able to cast their screens to an "aggregator" PC and show them on the overhead projector, kind of like a multiview screen for multiple camera's. We have devised a way using HDMI grabber cards, and wireless access points with modified firmware and a USB port, to be able to send their screen in the manner I have outlined, but I was hoping there was some way to do it without hardware. The hardware solution is really cool aside from the fact that their are 3 or 4 parts to the transmitter. Dave On Sun, Dec 20, 2015 at 2:44 PM, Carl Eugen Hoyos wrote: > dpeterson478 gmail.com> writes: > > > Does anyone know if there are any ports of FFmpeg that > > have any hope of streaming or recording an iOS desktop? > > Does avfoundation not work on iOS? > I thought it does... > > Carl Eugen > > ___ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
Re: [FFmpeg-user] OS X screen record by ffmpeg
Will this work in the same manner to screen record IOS? Dave On Mon, Dec 1, 2014 at 8:52 PM, Steven Liu wrote: > > > On Dec 1, 2014, at 3:33 PM, Thilo Borgmann > wrote: > > > > Am 01.12.14 um 07:51 schrieb Steven Liu: > >> [...] > >> I’ve list_devices the devices;but there have no screen option, > just only > > camera option; > >> Perhaps i have using the wrong parameters? > >> > >> > >> [StevenLiu@localhost ~]$ ffmpeg -f avfoundation -list_devices 1 -i "" > >> ffmpeg version N-65018-gad91bf8 Copyright (c) 2000-2014 the FFmpeg > developers > >> built on Jul 27 2014 20:36:24 with Apple LLVM version 5.1 > (clang-503.0.40) > > (based on LLVM 3.4svn) > > > > You're just using a version too old for that purpose. Screen capturing > that way > > was just recently added. Update to current HEAD and you should be fine. > > > > -Thilo > Hi Thilo, > > Thanks for your help, > It’s OK. > > > [StevenLiu@localhost ffmpeg]$ ./ffmpeg -f avfoundation -list_devices true > -i "" > ffmpeg version N-68139-g24e7e02 Copyright (c) 2000-2014 the FFmpeg > developers > built on Dec 2 2014 09:46:29 with Apple LLVM version 6.0 > (clang-600.0.54) (based on LLVM 3.5svn) > configuration: --enable-opengl --enable-libx265 --enable-libx264 > --enable-libmp3lame --enable-gpl --enable-libfaac --enable-nonfree > --prefix=/usr/ --enable-libfreetype --enable-libass > libavutil 54. 15.100 / 54. 15.100 > libavcodec 56. 13.100 / 56. 13.100 > libavformat56. 15.101 / 56. 15.101 > libavdevice56. 3.100 / 56. 3.100 > libavfilter 5. 2.103 / 5. 2.103 > libswscale 3. 1.101 / 3. 1.101 > libswresample 1. 1.100 / 1. 1.100 > libpostproc53. 3.100 / 53. 3.100 > [AVFoundation input device @ 0x7f85694065e0] AVFoundation video devices: > [AVFoundation input device @ 0x7f85694065e0] [0] FaceTime HD Camera > (Built-in) > [AVFoundation input device @ 0x7f85694065e0] [1] Capture screen 0 > [AVFoundation input device @ 0x7f85694065e0] AVFoundation audio devices: > [AVFoundation input device @ 0x7f85694065e0] [0] Built-in Microphone > : Input/output error > [StevenLiu@localhost ffmpeg]$ > > > > Steven > ___ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
Re: [FFmpeg-user] Problem with GDIGRAB device on Windows 7
Is there a way to use ffmpeg to "grab" an IOS screen" Dave On Sat, Nov 22, 2014 at 2:22 PM, Roger Pack wrote: > On Sun, Oct 5, 2014 at 9:26 PM, Yan Brenman > wrote: > > > Hello ffmpeg/gdigrab gurus! > > > > We are using "gdigrab" device on Windows to share/stream video for a > > specific application window (identified by a title as "gdigrab" > requires). > > Everything works great on Window 8.x - actual application window (and not > > the region on the desktop occupied by the application window) > > is getting shared and successfully played by the player on the receiving > > side. Which means that even if shared window is overlapped by the > > other window on the source - still the application window is getting > > played. > > Unfortunately, as we discovered, "gdigrab" doesn't work correctly on > > Window 7. And instead window sharing it actually does the region sharing. > > Which pretty much means that if shared window is being overlapped by the > > other window on the desktop - that's what getting played on the > > receiving side. > > Just for reference - we tried to do window sharing with > > screen-capture-recorder and unfortunately got exactly the same results. > > > > I would greatly appreciate any help/advise anybody can provide on the > > subject. And please let me know if there is any other information I can > > provide. > > > > Unfortunately there's no easy "fix" unless someone were to implement the > "PrintWindow" API. > Patches welcome, for sure. > -roger- > ___ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > ___ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
