Azure Communication Services
An Azure communication platform for deploying applications across devices and platforms.
1,239 questions
Issue with Screen Sharing Between iOS Clients Using Raw Video
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(137.6, 96%, 23%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EY%3C/text%3E%3C/svg%3E)
yrmal
20
Reputation points
Hi
I've implemented screen sharing on iOS using the Raw Video functionality, and it works well when sharing from iOS to a web client — the screen share appears correctly on the web side.
However, I’m running into an issue in the scenario where both the sharing and receiving clients are on iOS. When I join the call from one iOS device and screen share to another iOS device, the receiving client doesn’t get any screen sharing events. Specifically, the delegate method:
swift
CopyEdit
func remoteParticipant(_ remoteParticipant: RemoteParticipant, didChangeVideoStreamState args: VideoStreamStateChangedEventArgs)
is not triggered when screen sharing starts or stops. This method does get called correctly for camera on/off events, so the delegate is properly set.
I also tested this same scenario using the official sample app for Raw Video, and the behavior is the same — screen sharing between iOS clients doesn’t trigger any updates.
Could you please advise if this is a known limitation or if there’s a workaround?
Best regards,
Azure Communication Services
{count} votes
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Laxman Reddy Revuri 5,405 Reputation points Microsoft External Staff Moderator2025-05-09T10:11:11.64+00:00 Hi @yrmal
Could you confirm if your screen sharing implementation is based on Azure Communication Services (ACS) or if you are using a different communication SDK? -
yrmal 20 Reputation points
2025-05-09T10:17:12.35+00:00 @Laxman Reddy Revuri yes, all implementations based on Azure communication service
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Laxman Reddy Revuri 5,405 Reputation points Microsoft External Staff Moderator
2025-05-09T11:31:42.2866667+00:00 Hello @yrmal
I understand that you're experiencing an issue where screen sharing between two iOS clients using Raw Video functionality isn't working as expected. While camera stream events correctly trigger the didChangeVideoStreamState delegate, screen sharing events do not which suggests that this may be a current limitation in SDK’s support for iOS-to-iOS screen sharing. Unfortunately, the available documentation does not outline a specific workaround for this issue currently.
references:
https://learn.microsoft.com/en-us/azure/communication-services/quickstarts/voice-video-calling/get-started-raw-media-access?pivots=platform-ios
https://learn.microsoft.com/en-us/azure/communication-services/concepts/known-issues?pivots=platform-web#calling-web-sdk -
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(16, 60%, 11%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ESC%3C/text%3E%3C/svg%3E)
Suresh Chikkam 2,135 Reputation points Microsoft External Staff Moderator2025-05-12T09:30:40.0466667+00:00 Hi yrmal,
While the Azure Communication Services (ACS) SDK supports Raw Video for screen sharing, it is primarily designed and validated for scenarios where the receiving client is a web or desktop platform. In your scenario, where both the sender and receiver are iOS devices, the SDK does not currently propagate the screen sharing stream as a valid
RemoteVideoStreamto other iOS clients.This is the reason the delegate method
remoteParticipant(_:didChangeVideoStreamState:)is not triggered for screen share events, even though it works correctly for camera on/off changes. The same behavior occurs with the official ACS Raw Video sample for iOS, which confirms that this is an SDK limitation, not an implementation bug.We already discussed a related issue here, and based on the current SDK behavior, screen sharing using Raw Video is not fully supported for iOS-to-iOS communication as of the latest release.
At this time, there is no reliable or officially supported workaround to enable screen sharing between two iOS clients using Raw Video. Until support is added in a future SDK update, here are some practical suggestions.
- Use camera streams instead when both participants are on iOS.
- If possible, route one of the participants through a supported Web or desktop client.
- Advanced users may explore sending screen content as a custom video stream encoded as a virtual camera feed. However, this method is complex and not officially supported for full screen sharing workflows.
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Suresh Chikkam 2,135 Reputation points Microsoft External Staff Moderator
2025-05-19T10:48:35.9033333+00:00 yrmal, kindly check the private chat and provide the details there.
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