youtube-dl doesn't login again for each instance

[ghost]

I want to download multiple files using youtube-dl from a site the needs login.
The issue that I have is that youtube-dl is login for the first video with no issue, but doesn't login again for next video.

How do I force youtube-dl to login for each video, every time the function is called ?

def video_download(path, url):

        ydl = youtube_dl.YoutubeDL(
            {
                'outtmpl': path + '.mp4',
                'format': 'bestvideo+bestaudio/best',
                'username': email,
                'password': password,
                'cachedir': False,
                'noplaylist': True
                # 'quiet': True

            })

        with ydl:
            ydl.download([url])
        time.sleep(45)

I use multiple instances, because the function run in a loop and create a new instance each time. Also I tried different names.

def video_download(path, url, email, password, i):
    ydl = {}
    ydl[i] = youtube_dl.YoutubeDL( ..

Different instances, the first one is working, the next don't login again.Terminal/Output::

<youtube_dl.YoutubeDL.YoutubeDL object at 0x00000000050E4C18>
[safari] Downloading login form
[safari] Login successful
[safari] 9781787283664/video1_1: Downloading webpage

.............................
<youtube_dl.YoutubeDL.YoutubeDL object at 0x000000000337DD68>
[safari] 9781787283664/video1_2: Downloading webpage
[safari] 9781787283664/video1_2: Downloading kaltura session JSON
WARNING: Unable to download kaltura session JSON: HTTP Error 401: UNAUTHORIZED

Please give a working example. Thank you.

[dstftw]

ydl_opts = {
    'username': '...',
    'password': '...',
}

with youtube_dl.YoutubeDL(ydl_opts) as ydl:
    ydl.download(['BaW_jenozKc'])

with youtube_dl.YoutubeDL(ydl_opts) as ydl:
    ydl.download(['UxxajLWwzqY'])

[youtube] Downloading login page
[youtube] Looking up account info
[youtube] Logging in
[youtube] Checking cookie
[youtube] BaW_jenozKc: Downloading webpage
[youtube] BaW_jenozKc: Downloading video info webpage
[youtube] BaW_jenozKc: Extracting video information
WARNING: unable to extract uploader nickname
[youtube] BaW_jenozKc: Downloading MPD manifest
WARNING: Requested formats are incompatible for merge and will be merged into mkv.
[download] Destination: youtube-dl test video ''_ä↭𝕐-BaW_jenozKc.f137.mp4
[download] 100% of 2.11MiB in 00:00
[download] Destination: youtube-dl test video ''_ä↭𝕐-BaW_jenozKc.f251.webm
[download] 100% of 186.27KiB in 00:00
[ffmpeg] Merging formats into "youtube-dl test video ''_ä↭𝕐-BaW_jenozKc.mkv"
Deleting original file youtube-dl test video ''_ä↭𝕐-BaW_jenozKc.f137.mp4 (pass -k to keep)
Deleting original file youtube-dl test video ''_ä↭𝕐-BaW_jenozKc.f251.webm (pass -k to keep)
[youtube] Downloading login page
[youtube] Looking up account info
[youtube] Logging in
[youtube] Checking cookie
[youtube] UxxajLWwzqY: Downloading webpage
[youtube] UxxajLWwzqY: Downloading video info webpage
[youtube] UxxajLWwzqY: Extracting video information
WARNING: unable to extract uploader nickname
[youtube] UxxajLWwzqY: Downloading js player en_US-vflDmabfQ
[youtube] UxxajLWwzqY: Downloading MPD manifest
[download] Destination: Icona Pop - I Love It (feat. Charli XCX) [OFFICIAL VIDEO]-UxxajLWwzqY.f136.mp4
[download]  93.3% of 38.57MiB at  9.66MiB/s ETA 00:00

[youtube] Logging in
[youtube] Checking cookie
[youtube] BaW_jenozKc: Downloading webpage

[youtube] Logging in
[youtube] Checking cookie
[youtube] UxxajLWwzqY: Downloading webpage

[ghost]

I used the same example as yours with https://www.safaribooksonline.com/ and is not working. It is logging only first time.