Repository: youtube-dl
Issue: Add now.naver.com support
Labels: request

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## Checklist

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- [x] I'm reporting a feature request
- [x] I've verified that I'm running youtube-dl version **2021.05.16**
- [x] I've searched the bugtracker for similar feature requests including closed ones


## Description

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Add support for `now.naver.com`. Naver's NOW is a livestreaming platform with content typically being radio shows. Currently youtube-dl does not support the site.

[There is an existing tool](https://github.com/TheNoFace/now_downloader) that helped download the streams along with the respect chat log, but the tool does not work anymore. I **suspect** this is because they changed their URL format and now encrypt it judging by the value of `streamUrl` when looking at a show's content.

### Example
Show: `https://now.naver.com/player/10238`
Show ID: `10238`
Content URL: `https://now.naver.com/api/nnow/v1/stream/10238/content`

Parsed Stream URL (`videoStreamUrl`): `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`

<details>
    <summary>Response</summary>
    
   ```javascript
	{
		"contentList": [
			{
				"cpId": "vibe",
				"contentId": "10238",
				"groupId": "707",
				"video": true,
				"streamUrl": "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",
				"videoStreamUrl": "U2FsdGVkX18Y4EVoeuDFi4ZfhbTeR4+znlkbU8XCT2Wn4V4OQoJRaUyTnoCI8lulNI/+CiPWzZOVS2EpREDaopg61Ij+HWCzzOZ4PalbbAaRm9PLYV0Qbqqqt/hrA5fAemQPNrN5P4C81HyuWeFXHYC3HeWh4pw8xrvL6XO2/PlAkLxKOherj5aK0OiwAGjTWmNY+ORyPDEgiBOv8tzZLhMyJ/oyJR9uMj3k0qgnPu2t29lyvGT2z20wKI4qKgXuB6ugIP9jD7uAP3C0t3sTEltdw8RsiGr0B4pyT54/44l5g8+aQhZPg6jgsmzLqAg9gWwMS3fqRBcUmWlnnTjoWIsvdLUso2HLkcZoeuEjCvkqdBxt1+tXxvsE/NAek+lTIQMDXbN6+TfLOBtUSkuIBQXxZssJi8pdWsIhj5tvCXqsFmg27GMRv+wuozurJxtP66KN4NKrjbXUbly47m8aOhkdWntZIw9kHGOB+aaduSg7aURNCkt0t0C4uM7o9Ly9DiD11gWArUgRnJDK2h5vdwHb6P1vcBt8LLlo4i5+usWha0O/7go12UD/xn+nHCW/SjM0mS2/qXeoAyMq+kHj8fKn5gn1HEaafnHsuWvtykCWw8BZqEC9PJxs07dGWK3y6L7TQZBm4j80vUuIcQtv96PeNZt5HWB2zaCwPrq/FUqNzQ6pJ96e+O++P0xnsss8d9dxMyfsp8IxzGyWmZBofA==",
				"landscape": false,
				"videoConfig": {
					"orientation": "portrait"
				},
				"zeroratable": true,
				"start": "2021-05-20T02:59:33+09:00",
				"count": "",
				"again": false,
				"realtime": true,
				"bi": {
					"image": {
						"url": "https://nnow-phinf.pstatic.net/20210517_226/16212149733795jJRL_PNG/ef3346.png",
						"alt": "#OUTNOW 헤이즈 로고"
					},
					"symbol": {
						"url": "https://nnow-phinf.pstatic.net/20210517_227/16212150259990xM1X_PNG/09d23f.png",
						"alt": "#OUTNOW 헤이즈 심볼"
					},
					"color": "#FFFFFF",
					"jingle": "https://apis.naver.com/naverapps-now/nowapi/media/jingles/20210510/now_ver2_-5db_X__tnwjd_2qmIySX_xRwnwBp.mp3?msgpad=1621513894834&md=J14324GR2IsDYx4K6cbnGqH8cfM%3D"
				},
				"title": {
					"text": "#OUTNOW\r\n모두가 기다린 그 컴백\r\n헤이즈의 첫 신곡 라이브!",
					"link": "http://"
				},
				"description": {
					"text": "본: 5/20(목) 밤 8시\r\n재: 본방송 직후, 5/21(금) - 5/23(일) 밤 8시\r\n\r\n11개월을 기다린 헤이즈 컴백!\r\n\r\n7번째 EP [HAPPEN]으로 컴백하는 헤이즈(Heize)의 \r\n신곡 첫 라이브를 만날 수 있는 \r\n헤이즈 #OUTNOW!\r\n\r\n헤이즈의 감성이 담긴 곡 이야기는 물론 \r\n뮤직비디오와 신곡 무대까지 \r\n모~두 만날 수 있는 그 시간!\r\n\r\n5월 20일 저녁 8시, \r\n헤이즈 #OUTNOW 에서\r\n생방송 보쇼로 만나요✨|호스트: 헤이즈\r\n제작: 피치미디어, 네이버\r\n\r\n▶ 공식채널\r\nInstagram: https://www.instagram.com/now.kr/\r\nTwitter: https://twitter.com/kr_now\r\n네이버포스트: https://post.naver.com/now_kr",
					"link": "http://now.naver.com/10238",
					"scheme": "naversearchapp://playnow?contentId=10238&type=full&shouldPlayJingle=true&version=36",
					"clova": {
						"synonym": [
							"#OUTNOW 헤이즈"
						],
						"host": [
							"헤이즈",
							"Heize"
						],
						"hostid": [
							"314811"
						],
						"guest": [],
						"guestid": [],
						"mood": [],
						"short_term": false
					}
				},
				"playlist": {
					"image": "https://music-phinf.pstatic.net/20210517_94/1621215537744t6tom_PNG/ce20hez_05%C7%C3%B7%B9%C0%CC%B8%AE%BD%BA%C6%AE%C4%BF%B9%F6.png",
					"title": "#OUTNOW 헤이즈",
					"subtitle": "3일 전 업데이트 · 총 5곡, 13분",
					"url": "https://vibe.naver.com/ios/universal/playlistEnd?playlistId=now_outnowheize_0001",
					"profile": "https://now-vibe.onelink.me/Hs2c/df76732d"
				},
				"image": {
					"url": "https://nnow-phinf.pstatic.net/20210517_4/1621214973143f7hQY_PNG/d663e5.png",
					"alt": "#OUTNOW 헤이즈 포스터 배경"
				},
				"home": {
					"title": {
						"text": "#OUTNOW 헤이즈",
						"subtext": "헤이즈",
						"link": "http://"
					},
					"link": "http://홈링크, @wiki 1-1-영역2, @wiki 1-6-웹뷰",
					"image": {
						"url": "https://nnow-phinf.pstatic.net/20210517_282/1621214973606W0A8S_PNG/87a46f.png",
						"alt": "#OUTNOW 헤이즈 편성 포스터"
					},
					"icon": {
						"url": "https://nnow-phinf.pstatic.net/20210517_54/1621214973734eeBgA_PNG/2ede4d.png",
						"alt": "#OUTNOW 헤이즈 프로필"
					}
				}
			}
		]
	}
   ```
</details>