How can I encode multiple mediaStreamSource as one file in uwp?

Question

I want to record a section of my monitor and system audio. I will capture screen using wgc and audio using wasapi.

https://learn.microsoft.com/ko-kr/windows/uwp/audio-video-camera/screen-capture-video

docs above says I can use mediaTranscoder to capture video. But it seems to accept only one mediaSourceStream. what can I do for adding Audio mediasourceStream captured by wasapi? I thought I can use mediaComposition to merge mutliple mediaStreamSource, but it doesn't support real-time capture stream.

If it were impossible in uwp, I will use windows media foundation. If you have an idea to record both system audio and screen ( and hopely mike input), please tell me.

sorry I Just Checked your answer. Thank you for your advice. I will use MediaFoundation Sinkwriter because adding after record is not my option. thank you very much — sqa
– sqa, Commented Feb 1, 2024 at 12:00

Junjie Zhu · Accepted Answer · 2024-01-24 08:44:43Z

1

Currently, UWP does not have related APIs that support simultaneous recording. You need to capture separately and use Windows.Media.Editing.MediaComposition to add the audio to the video file.

Capture audio

Screen capture to video

answered Jan 24, 2024 at 8:44

Junjie Zhu

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