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I have been trying to stream my webcam over http with a raspberry pi 2 using mjpg-streamer. It works to stream the webcam and also some of the image controls, like brightness, focus, etc...
What I cannot seem to get to work is the zoom controls on the logitech's QuickCam Pro 9000. On a windows PC with the logitech software, I am able to zoom in and out. Yet, using mjpg-streamer, I am unable to replicate this control.
I have looked at a lot of links include:
http://www.slblabs.com/2012/09/26/rpi-webcam-stream/
http://sourceforge.net/projects/mjpg-streamer/
http://blog.philippklaus.de/2010/03/logitech-quickcam-pro-9000/
http://sourceforge.net/p/mjpg-streamer/code/HEAD/tree/
https://www.raspberrypi.org/forums/viewtopic.php?t=10496&p=124750
https://github.com/jacksonliam/mjpg-streamer/tree/master/mjpg-streamer-experimental
http://blog.cudmore.io/post/2015/03/15/Installing-mjpg-streamer-on-a-raspberry-pi/
http://www.slblabs.com/2012/09/26/rpi-webcam-stream/
Yet, I have not been able to figure out the zoom control for the webcam. Anyone have any idea how to get the zoom controls working with mjpg-streamer or another video streamer for USB webcam for the raspberry pi?
It turns out that there are no zoom controls after all for the webcam. The windows software simply does a digital zoom on the video feed from the webcam.
If you would like this feature for mjpeg-streamer, then it may be an idea to use a javascript script to add some sort digital zoom controls for the video feed from the webcam in the browser.
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My PC has two different audio outputs. One built in, another on LCD monitor connected through HDMI. I want to play different sounds in different speakers not semulteniously. Like if the LCD monitor has videos opened, the sound will pass over the HDMI. If built in display opens another application that plays sound, it will play in the built in speakers. How to do that in ubuntu or any Linux?
Using pulseaudio handler solved the problem.
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I am building some software on mac os x that uses iobluetooth and corebluetooth to connect/manipulate bluetooth devices.
Like most Bluetooth speakers, the Bluetooth classic network is hidden unless pairing but often the Bluetooth Low Energy network is visible.
I was wondering if there was some way to find a link to the Bluetooth classic section through the Bluetooth Low Energy network and use the details to establish a connection to the Bluetooth classic network.
I am assuming that your speaker is supporting both LE and classic Bluetooth profiles.
So you can connect le first by giving BD_ADDR and all the details for your speaker and later on you can change the transport to classic Bluetooth such as A2DP or SCO.
Thanks.
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Closed 3 years ago.
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Flashed five ESP8266 ESP-12e by using NodeMCU firmware. Then inserted each into the USB and no blue LED on the board came on. Only flashes momentarily when inserted then turns off. After this the "device manager" said we did have a COM9 port. Now COM9 is not there in the device manager. I have the drivers for CH341SER and CP2102 installed.
Arduino IDE has "port" but grayed out.
ESPlorer says "could not find any serial port".
NodeMCU says "Error:Serial port not exist".
Any possible solutions or should I throw the computer into a river?
Some laptops couldn't provide enough power to USB ports generating erratic behavior when connecting, Wifi connections draws much more power than a typical Arduino board. Try to use an externally powered USB dock. Worked for me!
I ran into the same problem. Successfully flashed the hardware with a custom .bin file made online through https://nodemcu-build.com/ then followed this tutorial here: https://www.youtube.com/watch?v=T-oSjMCmNYk now I can upload custom programs in c language to the node mcu hardware.
You will have to then restart your arduino IDE or whatever system/software you're using and follow the basic requirements to download the board related software and options in the ide there's plenty of tutorials for that basic work. The most important is the first step above.
Let me know if that worked for you or if you need further assistance.
Cheers
It looks like bad USB cable. Try another one.
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I have a bluetooth device (headphones) that supports playing audio over A2DP.
I've been pairing them with both an iPhone and an Android, and I get only extremely poor audio quality with both sources.
My suspicion is that the device only supports the SBC codec, but not Mp3. Or if it does MP3, only an abysmally low bitrate.
The manufacturer only states A2DP is supported, but not which codecs.
How can I determine which codecs are supported? Is there a kind of protocol sniffer I could use on my phone or my computer and interrogate the device to get a definitive answer on what it supports?
You can actually see used A2DP codec in iOS device's console.
Step-by-step guide:
Connect your iOS device to your Mac, answer Trust on the iOS device if you haven't done this before.
Open Console.app.
Select your iOS device on the left sidebar.
Type bluetooth in the top-right search bar, press Enter and select Subsystem instead of All:
Now, start playing to your bluetooth headphones on the iOS device (codec activates only when you output sound).
Press Cmd+F and search for Starting a2dp send thread in your console messages:
You'll see used codec in codec: field. Values are the same as specified in Bluetooth specs (example). Basically 0 = SBC, 2 = AAC.
Was very surprised, though, that a pair of headphones I just bought from very adored and award-winning manufacturer (not Sennheiser) does not have AAC codec in them, despite having that in specifications (will not name them here, contacting their tech support for clarification).
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Closed 8 years ago.
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In the Options for the Google Cast extension under 'Tab projection quality', there are three options:
Extreme (720p high bitrate)
High (720p)
Standard (480p)
1080p is not listed.
I assume if I play a 1080p video that it will work because it's sending the video url to Chromecast, but am I limited to 720p for regular HTML webpages?
This appears to be more of a user question, not a development question.
The Google Cast extension for Chrome provides two major functions:
Chrome Mirroring - which is limited to 720p - This acts by encoding your tab to WebM/Opus and then sending to the Chromecast device.
The Google Cast API for Chrome which allows your webpage to cast a video to a Chromecast device. Which, of course can be full 1080p. Official documentation.