I’m looking to essentially use two devices: raspberry pi 3 and Mac 10.15. I am using the pi to capture video from my web cam and I want to use my Mac to kind of extend to the pi so when I use cv2.videocapture I can capture that same video in preferably real-time or something close. I’m programming this using python on bout devices. I thought of putting it on a local server and retrieving it but I have no idea how I could use that with opencv. If someone could provide and explain a useful example, I would greatly appreciate it. Thank you.
To transfer a video stream, you could use instead of a custom solution a RTMP server on the source machine feeding it with the cam source and the target opens the stream and processes it.
A similar approach to mine is widely implemented into IP cameras: They run a RTMP server to make the stream available for phones and PC.
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I want to stream my processed OpenCV output in Python as a local webcam stream so it can be used by other programs as any other webcam. Is it possible? Are there any libraries that can do it?
I've read through some stackoverflow questions and found this: Stream OpenCV output as emulated webcam? that is pretty similar to my problem (but in Java/C++)
instead of doing:
cv2.imshow("...", output)
every frame I want to have a stream that I can supply images and that would then be considered as a webcam by other programs.
I also went through this trouble and believe me I got a really better solution for every platform.
Just install droidcam on your machine. Find the port it uses to connect with the mobile application. Normally it is port 4747. Then just connect to it using the python socket. Start the server on the local host and port 4747. It will connect and stream video to that.
Droid cam can be used with any other software like Zoom.
I am trying to build a device that will encode h.264 video on a raspberrypi and stream it out to a separate web server in the cloud. The main issue I am having is most implementations I search for either have the web server directly on the pi or have the embedded player playing video directly from the device.
I would like it to be pretty much plug and play no matter what network I am on ie no port forwarding of any sort all I need to do is connect the device to the network and the stream will be visible on a webpage.
One possible solution to the issue is just simply encode frames in base 64 as jpegs and send them to a an endpoint on the webserver, however, this is a huge waste of bandwidth and wont allow for the framerate h.264 would.
Any idea on some possible technologies that could be used to do this?
I feel like it can be done with some websockets or zmq and ffmpeg somehow but I am not sure.
It would be helpful if you could provide more description of the architecture of the device. Since it is an RPI, it is probably also being used for video acquisition via the camera expansion port. If this is the case, you can access the video device and do quite a bit with respect to streaming using the combination of available command line tools.
Something like the following will produce an RTMP stream from the video camera host.
raspivid [preferred options] -o - | ffmpeg -i - [preferred options] rtmp://[IP ADDR]/[location]
From there, FFmpeg will do a lot of heavy lifting for you.
This will now enable remote hosts to access the RTMP stream.
Other tools that would complement that architecture may be ffserver where the rtmp stream from the rpi host could be acquired and then be made available to a variety of clients such as a player in a webpage. Quick look shows ffserver may be obsolete, but that there are analogous components.
I'm trying to create an interactive voice-tree for an art project. Think of something like a choose-you-own-adventure, but on the phone and with voice commands. I already have a fair amount of experience working with Construct 2 (game-making software), and can easily build a branching, voice controlled interaction loadable through a modern browser with it. For reasons relevant to the overall story, I need players to connect to the interaction through a Google Voice number they will call.
I already have a GV number and have written an AutoHotKey script to auto-answer the Hangouts call, but I'm stuck trying to route the audio from the caller in Hangouts to the browser AND the audio response output of the browser back to the caller.
I know of an extremely primitive way to accomplish this, [which I've illustrated with this diagram:
Unfortunately, this is rather cumbersome and I suspect I can achieve my goal through virtualization or at the VERY least some sort of attenuation cables between two physical machines (I tried running a generic AUX cable between two laptops, but couldn't get speaker audio to go into microphone audio from one to the other).
I've been experimenting on Parallels running Windows 8.1 with Virtual Audio Cable(no luck), JACK(too robust), Chevolume(too limited), and IndieVolume(too limited).
I suspect VAC would be the best bet, but I can't seem to find a way to route Firefox audio output to a microphone input which directs to Chrome and vice versa. If I try accomplishing it all through just one virtual machine I have to use two different browsers for the voice-tree webpage and Hangouts call since Hangouts pushes its audio through Chrome (even the stand-alone application).
Is there any way to route microphone input and speaker output separately between two virtual machines? If not, could I still try and accomplish this with a specific type of cables between two laptops running windows 7/8 that have generic audio jacks?
I want to be able to capture images from a webcam on Linux. This is still a project requirement and I'm having a difficulty finding up-to-date information about capturing images from a webcam on Linux. Is it true that every webcam has different API (unlike the Windows variant where I can use a common API), so I must write the program for a specific webcam?
Webcams on Linux are accessed through the Video4Linux API, which is common across all camera models.
There are plenty of existing framegrabbers for webcams that use this API - you could look at these for ideas, or just one as-is.
I want to make (for fun, challenge) a videoconference application, I have some ideas about this:
1) taking the audio/video streams (I don't know what an audio/video stream is)
2) pass this to a server that lets communicate the clients. I can figure out how to write a server(there are a lot of books and documentation about this) but I really don't know how to interact with the webcam and with the audio/video in general.
I want some links, book, suggestions about the basics of digital audio/video expecially on programming. Please help me!!!
I want to make it run on a Linux platform.
Linux makes video grabbing really nice. As long as you have a driver that outputs the video stream to the /dev/video/v* channels. All you have to do is open up a control connection to the device [an exercise for the OP] and then read in the channel like a file [given the parameters set by the control connection. Audio should be the same way, but don't quote me on it.
BTW: Video streaming from a server is a very complex issue. You have to develop or use an existing protocol. You have to be very aware of networking delays, and adjust the information sent (resize or recompress) to the client based on the link size between the client and the server.