v4lsrc channel why disappear?
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v4lsrc channel why disappear?
 
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hi,
in the old days there exists such a properties as channel, but now it's disappear. and there was an input too, which is also disappear. why? is there anything what can i use? eg. if i've a 4 channel BT878 v4l source can i see the second channel with gst-launch? -- Levente "Si vis pacem para bellum!" ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
Re: v4lsrc channel why disappear?
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Hi,
I am not sure about your question and your requirements but the v4l2src from plugins-good implements the gsttunner interface, that permits to select the input. An example to use it here : http://webcvs.freedesktop.org/gstreamer/gst-plugins-good/tests/icles/v4l2src-test.c?revision=1.1&view=markup Stefan said : "You can only cast in PAUSED or PLAYING (not sure about READY). Basically the devices has to be opened first, before the element knows that the underlying hardware has support for tuner. The gst_implements_interface mechanism is basically a hack to conditinally implement interfaces." I have experimented it and it works fine. (note that The S-Video and Composite input were switched but I think it's a driver problem.) Ok, if you are talking about playing multiple channel at the same time, I am not aware about this. Sincerely J. 2008/5/5 Farkas Levente <[hidden email]>: hi, ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
Re: v4lsrc channel why disappear?
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In reply to this post by Farkas Levente-2
Ok.
You mean it is possible to play all the 4 composite input at the same time ? 2008/5/5 Farkas Levente <[hidden email]>: no we've got 4 composite channel and not one composite channel with a tv tunner:-( ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
Re: v4lsrc channel why disappear?
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yes.
Julien Isorce wrote: > Ok. > > You mean it is possible to play all the 4 composite input at the same time ? > > 2008/5/5 Farkas Levente <[hidden email] <mailto:[hidden email]>>: > > no we've got 4 composite channel and not one composite channel with > a tv tunner:-( > > Julien Isorce wrote: > > Hi, > > I am not sure about your question and your requirements but the > v4l2src from plugins-good implements the gsttunner interface, > that permits to select the input. > > An example to use it here : > > http://webcvs.freedesktop.org/gstreamer/gst-plugins-good/tests/icles/v4l2src-test.c?revision=1.1&view=markup > <http://webcvs.freedesktop.org/gstreamer/gst-plugins-good/tests/icles/v4l2src-test.c?revision=1.1&view=markup> > <http://webcvs.freedesktop.org/gstreamer/gst-plugins-good/tests/icles/v4l2src-test.c?revision=1.1&view=markup > <http://webcvs.freedesktop.org/gstreamer/gst-plugins-good/tests/icles/v4l2src-test.c?revision=1.1&view=markup>> > > > Stefan said : > "You can only cast in PAUSED or PLAYING (not sure about READY). > Basically the devices has to be opened first, before the element > knows that the underlying hardware has support for tuner. The > gst_implements_interface mechanism is basically a hack to > conditinally implement interfaces." > > I have experimented it and it works fine. (note that The S-Video > and Composite input were switched but I think it's a driver > problem.) > > Ok, if you are talking about playing multiple channel at the > same time, I am not aware about this. > > Sincerely > > J. > > 2008/5/5 Farkas Levente <[hidden email] > <mailto:[hidden email]> <mailto:[hidden email] > <mailto:[hidden email]>>>: > > > hi, > in the old days there exists such a properties as channel, > but now it's > disappear. and there was an input too, which is also > disappear. why? > is there anything what can i use? > eg. if i've a 4 channel BT878 v4l source can i see the second > channel > with gst-launch? > > -- > Levente "Si vis pacem para > bellum!" > > > ------------------------------------------------------------------------- > This SF.net email is sponsored by the 2008 JavaOne(SM) Conference > Don't miss this year's exciting event. There's still time to > save $100. > Use priority code J8TL2D2. > > http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone > _______________________________________________ > gstreamer-devel mailing list > [hidden email] > <mailto:[hidden email]> > <mailto:[hidden email] > <mailto:[hidden email]>> > > https://lists.sourceforge.net/lists/listinfo/gstreamer-devel > > > > > -- > Levente "Si vis pacem para bellum!" > > -- Levente "Si vis pacem para bellum!" ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
Re: v4lsrc channel why disappear?
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oh ok you are the one who started the discussion about multi channel frame grabber:
good luck anyway 2008/4/30 <[hidden email]>: On Wed, Apr 30, 2008 at 09:03:51PM +0200, Farkas Levente wrote: > anybody, any comment? > > Farkas Levente wrote: > > hi, > > as i wrote earlier we'd like to add support for multi channel frame > > grabber cards in gstreamer. what's the problem: > > currently there are the only hardware video input supported by gstreamer > > is the v4l or v4l2 compatible video sources. there are good for common > > hardware like ip camera, tv card (with tunner) or other hardware like > > s-video input etc. but there are many kind of card which has more > > (4,8,16,24) input channel (usually analog input). there card can give > > raw or encoded video sources. but these usually has one physical devices > > ie. one /dev/videoX devices (in this case we've got n composite input). > > we'd like to build in this case n pipeline for the n input channel. one > > of the simple example IVC-100 card which has one bt878 chip and 4 > > composite input and one 4 channel multiplexer. > > http://www.iei.com.tw/en/product_IPC.asp?model=IVC-100G > > in this case we can use v4l and choose one of the channel but we'd like > > to build 4 pipeline and set different parameters on the different > > pipeline's source properties (like frame rate, resolution etc). what's > > more we'd like to modify the source element properties during it's > > running eg. i'd like to modify the 2nd channel frame rate while wouldn't > > like to stop the other 4 pipeline!!! and it's an important feature. > > what we can do? > > - we can create a new source element with 4 output pads, > > - or create a new source element with one output pad, but we'd like to > > create 4 such source element which can parallel use the same device's > > different input channel. > > the first would be the easier, but in this case we can't modify one of > > the input channel's parameter without stop the other pipelines:-( or can > > i do it somehow? and in this case all of the pipeline has to be run in > > the same process. > > in the second case we can start and stop the pipeline independently > > what's more use them in different process, but we probably have to > > create some kind of master/controller process which control the access > > of the source elements to the device. > > what do you think about it? > > what do you suggest about it? > > what's your comments? > > thanks in advance. are exactly... Anyway, I can confirm that GStreamer works perfectly fine with an ViewCast Osprey 440 which has 4 composite video channels. While we use the very same settings for all inputs in our setup, the channels really are entirely independant. I've done numerous tests without any problem (excepted bad cables) In our setup we optionally use such cards (or any v4lsrc channel) to monitor the inputs of video switchers : we grab all four channels from a single networked pipeline in our headless backend, and send them with gstreamer to our X11 frontend. While we create a single pipeline with all four inputs, you can just as easily create several independant pipelines. You can see the source or download the whole project from : http://boxtream.unice.fr Hoping this helps. Bye, Jerome Alet 2008/4/14 Andres Colubri <[hidden email]>: Hi Farkas, I'm very interested in this topic, since I'm currently writing a source element for the matrox morphis capture card: http://www.matrox.com/imaging/products/morphis/ This card supports up to 4 simultaneous cameras, but as you mentioned for the ICV-100 card, it has only one physical device. So right now i did a very quick and dirty hack where I send the frames from each camera one after the other (i.e.: frame i is from camera 1, frame i+1 from camera 2, frame i+2 from camera 3, frame i+3 from camera 4, frame i+4 is again from camera 1, and so on)... this was just for testing. I'm very interested to see what would be the answers for the questions in your email. Best, Andres Farkas Levente wrote: > hi, > as i wrote earlier we'd like to add support for multi channel frame > grabber cards in gstreamer. what's the problem: > currently there are the only hardware video input supported by gstreamer > is the v4l or v4l2 compatible video sources. there are good for common > hardware like ip camera, tv card (with tunner) or other hardware like > s-video input etc. but there are many kind of card which has more > (4,8,16,24) input channel (usually analog input). there card can give > raw or encoded video sources. but these usually has one physical devices > ie. one /dev/videoX devices (in this case we've got n composite input). > we'd like to build in this case n pipeline for the n input channel. one > of the simple example IVC-100 card which has one bt878 chip and 4 > composite input and one 4 channel multiplexer. > http://www.iei.com.tw/en/product_IPC.asp?model=IVC-100G > in this case we can use v4l and choose one of the channel but we'd like > to build 4 pipeline and set different parameters on the different > pipeline's source properties (like frame rate, resolution etc). what's > more we'd like to modify the source element properties during it's > running eg. i'd like to modify the 2nd channel frame rate while wouldn't > like to stop the other 4 pipeline!!! and it's an important feature. > what we can do? > - we can create a new source element with 4 output pads, > - or create a new source element with one output pad, but we'd like to > create 4 such source element which can parallel use the same device's > different input channel. > the first would be the easier, but in this case we can't modify one of > the input channel's parameter without stop the other pipelines:-( or can > i do it somehow? and in this case all of the pipeline has to be run in > the same process. > in the second case we can start and stop the pipeline independently > what's more use them in different process, but we probably have to > create some kind of master/controller process which control the access > of the source elements to the device. > what do you think about it? > what do you suggest about it? > what's your comments? > thanks in advance. > yours. > > 2008/5/5 Farkas Levente <[hidden email]>: yes. ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
Re: v4lsrc channel why disappear?
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Hi,
Does anyone already write a gstreamer source filter for this card: http://www.matrox.com/imaging/fr/produits/morphis_qxt/home.cfm ? I mean using their SDK. I have not tried on linux but I think their driver is not compatible with v4l2. On windows, their driver is not compatible with directshow. Note that I have not tried the compatibility with VFW or KSVideo. (How can I check that ?) Julien
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