Record WebRTC call in iOS

[Remya Das]

Hi,

I'm developing an iOS app which is based on WebRTC.

I want to record the call (Audio & Video). How can I do this?

[Michael Schropp]

If you still need to record the camerastream, I had the same problem and found a way to do so.

You can use the RTCAVFoundationVideoSource (instead of the RTCVideoSource) Class that exposes the AVCaputureSession. Sadly it is not possible to add a second Output to the Session, because the RTC-Framework will lose the camerastream.

But it is possible to add a own delegate and write, with an AVAssetWriter, the buffersamples to a file and still send the samples to the rtc-framwork.

Code in Swift:

func configurateForRecording()

    {

        for outputs in captureSession.outputs {

            if let videoOutput = outputs as? AVCaptureVideoDataOutput {

// adding self as delegate and store rtc as externalSampleBufferDelegate

                externalSampleBufferDelegate = videoOutput.sampleBufferDelegate;

                videoOutput.setSampleBufferDelegate(self, queue: recordQueue)

            }

        }

    }

    

    func captureOutput(captureOutput: AVCaptureOutput!, didOutputSampleBuffer sampleBuffer: CMSampleBuffer!, fromConnection connection: AVCaptureConnection!) {

        

        // write here with AVAssetWriter to File

        writeSampleBuffer(sampleBuffer, type: AVMediaTypeVideo)

        // send sampelBuffer to RTC 

        externalSampleBufferDelegate?.captureOutput!(captureOutput, didOutputSampleBuffer: sampleBuffer, fromConnection: connection)

    }

If you have questions, hit me up.

Michael

[Manish Pathak]

Hello Michael,

I am in a urgent need to implement the same, I have achieved it through AVCaptureMovieFileOutput but it was giving problems later on.
What I want you to let me know what is here
externalSampleBufferDelegate ?
&
From where should exactly get this captureSession, I am using appRTC lib.
& while creating localVidoeTrackForBackCamera like this -

        _recordCaptureSession = [[RTCAVFoundationVideoSource alloc] initWithFactory:_factory constraints:mediaConstraints];
        _recordCaptureSession.useBackCamera = YES;

Please tell me where I am wrong I am able to export the video with this too but the local  preview of my device gets freezes on remote end ?

Thanks

[Vinay]

Hi Remya Das,

Did you got the solution for live video call recording by using WebRTC.

[Nagamuni reddy]

Hi vinay, 

I have the solution for recording live video call using WebRTC.

[Ryan Warren]

Please post your solution.

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[Srinivasan P]

Hi, can you post your solution here?

[Vidhi kalola]

Hi,

Can you please post your solution here?

On Sunday, March 10, 2019 at 10:58:42 PM UTC+5:30, Nagamuni reddy wrote:

[Ibrahim salah]

hi,

i need to know which library did you used,

and how to add turn server in it

thanks,

[Nagamuni reddy]

Hi Ibrahim, 

I did it in webRTC source code and didn't use any library for that.

[Shraddha Susare]

Hi,

@Michael -  The code snippet that you have posted is for local video that we get from AVCapture Session. Do you have any idea about how to record the remote video?

[Piasy Xu]

Check this out: https://github.com/HackWebRTC/webrtc/commit/dfbcd2c75d27dafd24512d6ca3d24c6d86d63b82

在 2020年6月28日星期日 UTC+8下午6:33:20，Shraddha Susare写道：

[Shraddha Susare]

Basically I want to record the remote video in iOS app (using Google WebRTC pod). I got success in recording local video using AVCaputureSession. Now, in order record remote video, first I need to get remote video frames/buffer from RTCVideoRenderer(i know one method like renderFrame( RTCVideoFrame *)frame in this class, which renders frame, but how to get that frame). Does anyone help in this, how can I get frames from renderer?

Note: In android, they provided VideoSink method so we can get the frames, but no such class in iOS.

[Sanjay Kumawat]

I was able to extract the frame but cannot convert RTCVideoFrame to CMBufferBuffer can someone please help

[Markus Handell]

The encoded sink APIs [1] lets you capture the remote stream's encoded content. You need to 0) add an encoded sink, 1) Call GenerateKeyFrame and store the incoming keyframe + later frames only (earlier will be undecodable)

You will have to mux the incoming frames into some container yourself. Not sure what muxing tech you have access to.

[1]
https://source.chromium.org/chromium/chromium/src/+/master:third_party/webrtc/api/media_stream_interface.h;l=142-156;drc=80eb3a8449fdbcd51abc47565fe6d2cb08420129

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