# – Only First User's Pixel Buffer Received in PiP Mode with Multiple ZoomVideoSDKRawDataPipe Subscriptions

**URL:** <https://devforum.zoom.us/t/only-first-users-pixel-buffer-received-in-pip-mode-with-multiple-zoomvideosdkrawdatapipe-subscriptions/134895>\
**Category:** iOS\
**Tags:** phone\
**Created:** [July 6, 2025, 6:41am UTC](https://devforum.zoom.us/t/only-first-users-pixel-buffer-received-in-pip-mode-with-multiple-zoomvideosdkrawdatapipe-subscriptions/134895 "2025-07-06T06:41:09Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![yash6](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/yash6/32/70076_2.png) [@yash6](https://devforum.zoom.us/u/yash6)\
**Post date:** [July 6, 2025, 6:41am UTC](https://devforum.zoom.us/t/only-first-users-pixel-buffer-received-in-pip-mode-with-multiple-zoomvideosdkrawdatapipe-subscriptions/134895/1 "2025-07-06T06:41:09Z")

</div>

I am **subscribing to multiple participants** using the `ZoomVideoSDKRawDataPipe` API to receive **raw video data** , with the intention of rendering all subscribed users’ video streams into a **composite view** that is shown in both fullscreen and PiP modes.

### Implementation Details:

- For each participant, I create a separate `ZoomVideoSDKRawDataPipe` instance.
- I subscribe using:

swift

CopyEdit

```auto
let rawDataPipe = user.getVideoPipe()
rawDataPipe?.subscribe(self)

```

- I conform to `ZoomVideoSDKRawDataPipeDelegate` and expect to receive pixel buffers via:

swift

CopyEdit

```auto
func onPixelBuffer(_ pixelBuffer: CVPixelBuffer!, frameInfo: ZoomVideoSDKVideoFrameInfo!)

```

### The Problem:

In **PiP mode** , I’m only receiving pixel data for the **first subscribed participant**. All other `ZoomVideoSDKRawDataPipe`instances do not invoke their delegate methods, as if they are being ignored or throttled in PiP mode.

### What I Need to Achieve:

- Show **multiple participants** in a **composite video layout** (e.g., grid or stacked view) in **Picture-in-Picture mode**.
- Continue receiving **pixel buffers for all subscribed users** via `ZoomVideoSDKRawDataPipeDelegate`, even after PiP starts.
- Maintain custom rendering (I am not using `ZoomVideoSDKVideoCanvas`) and merge the pixel buffers into a shared AVSampleBuffer stream that feeds PiP.

### My Questions:

1. Is it currently supported to subscribe to and receive **multiple `ZoomVideoSDKRawDataPipe` streams** in **PiP mode**?
2. Is there an internal SDK limitation that restricts `ZoomVideoSDKRawDataPipeDelegate` callbacks to only one stream while in PiP?
3. Is there a recommended approach to enable **multi-user raw data access** for rendering in PiP mode?
4. If not currently supported, is multi-user raw video support in PiP planned in a future update?

### Environment:

- **Zoom Video SDK iOS Version:** [v1.13.10]
- **iOS Version:** [e.g., iOS 18.2]
- **Device:** [e.g., iPhone 15 Pro]
- **PiP Enabled:** Yes, via Background Modes and CallKit integration
- **Rendering:** Using custom composite rendering via CoreVideo + AVSampleBufferDisplayLayer

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex016/uploads/zoomdeveloper/original/3X/6/1/614bdd549b610bbaa46ff934617683a02bdaa03c.png) [@system](https://devforum.zoom.us/u/system)\
**Post date:** [July 6, 2026, 6:41am UTC](https://devforum.zoom.us/t/only-first-users-pixel-buffer-received-in-pip-mode-with-multiple-zoomvideosdkrawdatapipe-subscriptions/134895/2 "2026-07-06T06:41:37Z")

</div>

Closed on July 6, 2026, 6:41am UTC

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