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• combining separate audio and video files into one file C++

  16 juin 2016, par Aashish Shrestha

  I am working on a C++ project with openCV. It is a simple web cam application with basic features like capturing pictures and videos. I have already been able to save video (w/o audio). Since openCV doesnot support audio processing, I was wondering if there is any way I can record audio separately in a different file and later combine those together to get one video file.
  While searching on the internet, I did hear something about using ffmpeg with openCV. But I just cant figure out how to do it exactly.....

  Can you guys help me ? I would be very grateful... Thankyou !

  P.S. I have used openCV and QT (for GUI)

• How to scape special characters for linux, nodejs exec function

  22 février 2023, par David Chavez

  I'm running this ffmpeg command on my linux server and while I paste it into the terminal, it works just fine but as soon as I use execPromise to run the EXACT same command, it returns an error.

  


  const { exec } = require('child_process');
const { promisify } = require('util');
const execPromise = promisify(exec);

const encode = async ffmpegCode => {
    try {
        console.log(ffmpegCode) //Here I can see that the code is the
                                //exact same one than the one that works
                                //when pasted into the terminal
        await execPromise(ffmpegCode);
        return 200
    } catch (err) {
        console.log(err)
    }
}


  


  I need \: to be interpreted as such. When I type it as is, \:, the error message shows me that it interpreted it as : which is expected.

  


  If I pass in \\:, I expect it to interpret it as I need it which would be \: but the error shows me that it interprets it as \\:.

  


  \\\: is interpreted as \\: and \\\\: is interpreted as \\\\:.

  


  Part of the command passed :

  


  ...drawtext=text='timestamp \\: %{pts \\: localtime \\: 1665679092.241...

  


  Expected command :

  


  ...drawtext=text='timestamp \: %{pts \: localtime \: 1665679092.241...

  


  Error message :

  


  ...drawtext=text='timestamp \\: %{pts \\: localtime \\: 1665679092.241...

  


  How do I get /: through to the exec function ?

  


• Replicate camera and microphone to use across multiple programs

  12 août 2020, par Andrew

  I'd like to use the same webcam and microphone across multiple streams, for example Google Meets and Microsoft Teams at the same time.

  


  When one of the sources use the webcam/mic, they lock it in and they can't be used anywhere else. Is there a way to replicate or unfreeze them ?

  


  I tried via ffmpeg, specificaly by outputting as dshow, but got :

  


  Requested output format 'dshow' is not a suitable output format

  


  I also tried this solution : https://superuser.com/a/1531380/934167 but didn't manage to replicate the device.

  


  If possible, I'd like to stick to ffmpeg, but if it requires third party (preferably open source) applications, I can try that out.

  


  Edit : I should also mention, I'd prefer this for Windows/Mac, other solutions were only relevant for linux.