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• How to convert iphone's caf to ogg on ubuntu

  24 novembre 2012, par Amure Pinho - Syncmobile

  i really need your support to solve that problem :

  We developed an iOS application that sends a sound file to our server and then, we share this audio.

  The problem is we didnt find any solution to convert the audio inside the iOS.

  We tought : Ok, thats a problem, but we can still convert the audio in the server right ?

  We are trying to make this using afconvert, ffmpeg but with no sucess.

  Do you have any basic guide or hint so we can write this in our server application and convert all the .CAF files to another format like OGG or MP3 ?

  Thanks a lot !

• 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 ?