a bunch of
Waiting before next display check...
Waiting before next display check...
ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9 (Ubuntu 9.3.0-17ubuntu1~20.04)
  configuration: --disable-debug --disable-doc --disable-ffplay --enable-shared --enable-avresample --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-gpl --enable-libass --enable-fontconfig --enable-libfreetype --enable-libvidstab --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libxcb --enable-libx265 --enable-libxvid --enable-libx264 --enable-nonfree --enable-openssl --enable-libfdk_aac --enable-postproc --enable-small --enable-version3 --enable-libbluray --enable-libzmq --extra-libs=-ldl --prefix=/opt/ffmpeg --enable-libopenjpeg --enable-libkvazaar --enable-libaom --extra-libs=-lpthread --enable-libsrt --enable-libaribb24 --extra-cflags=-I/opt/ffmpeg/include --extra-ldflags=-L/opt/ffmpeg/lib
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
[x11grab @ 0x56461aaacb80] Cannot open display selenium-node-chrome:99.0, error 1.
selenium-node-chrome:99.0: Input/output error
2022-05-17 15:42:01,783 INFO exited: video-recording (exit status 1; not expected)

package main

import (
	"fmt"

	"context"
	"io/ioutil"
	"time"
	"github.com/mafredri/cdp"
	"github.com/mafredri/cdp/protocol/emulation"
	"github.com/mafredri/cdp/protocol/page"
	"github.com/mafredri/cdp/rpcc"
)


func main() {
	ctx, cancel := context.WithTimeout(context.Background(), time.Hour * 1)
	defer cancel()

	// Initiate a new RPC connection to the Chrome DevTools Protocol target.
	conn, err := rpcc.DialContext(ctx, " ws://172.20.10.2:4444/session/82d41ac1d90a58a8b8798e4adaa5e9a0/se/cdp ")
	if err != nil {
		fmt.Println(err)
	}
	defer conn.Close() // Leaving connections open will leak memory.

	c := cdp.NewClient(conn)
	
	emulationArgsPointer := emulation.NewSetDeviceMetricsOverrideArgs(645,9651,2.0,false)
	emulation:= c.Emulation.SetDeviceMetricsOverride(ctx,emulationArgsPointer)
	if emulation != nil {
		fmt.Println("error here")
		fmt.Println(emulation)
	}
	
	fmt.Println(emulation)
	// Capture a screenshot of the current page.
	screenshotName := "screenshot.jpg"
	screenshotArgs := page.NewCaptureScreenshotArgs()
	screenshot, err := c.Page.CaptureScreenshot(ctx, screenshotArgs)
	if err != nil {
		fmt.Println(err)
	}
	if err = ioutil.WriteFile(screenshotName, screenshot.Data, 0644); err != nil {
		fmt.Println(err)
	}
	
}