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Egress has its own resolution, which can be set in the egress request

thank you I have noticed that, Can we have adaptive orientation, do we have to set hard portrait/landscape

const (
	EncodingOptionsPreset_H264_720P_30           EncodingOptionsPreset = 0 //  1280x720, 30fps, 3000kpbs, H.264_MAIN / OPUS
	EncodingOptionsPreset_H264_720P_60           EncodingOptionsPreset = 1 //  1280x720, 60fps, 4500kbps, H.264_MAIN / OPUS
	EncodingOptionsPreset_H264_1080P_30          EncodingOptionsPreset = 2 // 1920x1080, 30fps, 4500kbps, H.264_MAIN / OPUS
	EncodingOptionsPreset_H264_1080P_60          EncodingOptionsPreset = 3 // 1920x1080, 60fps, 6000kbps, H.264_MAIN / OPUS
	EncodingOptionsPreset_PORTRAIT_H264_720P_30  EncodingOptionsPreset = 4 //  720x1280, 30fps, 3000kpbs, H.264_MAIN / OPUS
	EncodingOptionsPreset_PORTRAIT_H264_720P_60  EncodingOptionsPreset = 5 //  720x1280, 60fps, 4500kbps, H.264_MAIN / OPUS
	EncodingOptionsPreset_PORTRAIT_H264_1080P_30 EncodingOptionsPreset = 6 // 1080x1920, 30fps, 4500kbps, H.264_MAIN / OPUS
	EncodingOptionsPreset_PORTRAIT_H264_1080P_60 EncodingOptionsPreset = 7 // 1080x1920, 60fps, 6000kbps, H.264_MAIN / OPUS
)

You do have to choose explicit dimensions of the window being recorded, but you can make a template that can adapt the video size within the web page