YouTube Data API v3返回的搜索结果很少

Question

我正在使用YouTube数据API v3搜索YouTube并解析结果。即使响应上显示4241结果：

resp["pageInfo"]
{'totalResults': 4241, 'resultsPerPage': 50}

我只有几个视频（在这种情况下为49个）。

下面是我用于从搜索API获取所有视频的代码：

def search_youtube(keyword):
    base_video_url = 'https://www.youtube.com/watch?v='
    base_search_url = 'https://www.googleapis.com/youtube/v3/search?'
    # See full sample for function
    first_url = base_search_url+'key={}&q={}&part=snippet,id&order=date&maxResults=50'.format(API_KEY, keyword)
video_links = []
    url = first_url

    while True:
        print(len(video_links))
        inp = requests.get(url)
        resp = json.loads(inp.text)

        for i in resp['items']:
            if i['id']['kind'] == "youtube#video":
                    video_links.append(base_video_url + i['id']['videoId'])
        try:
            next_page_token = resp['nextPageToken']
            url = first_url + '&pageToken={}'.format(next_page_token)
        except:
            break
    return video_links

all_videos = search_youtube("ural altay")  

我永远无法从中收集所有视频。可能是什么原因？