download youtube embed video can't exit normally

[Jokertion]

Checklist

• I'm reporting a broken site support issue
• I've verified that I'm running youtube-dl version 2020.09.20
• I've checked that all provided URLs are alive and playable in a browser
• I've checked that all URLs and arguments with special characters are properly quoted or escaped
• I've searched the bugtracker for similar bug reports including closed ones
• I've read bugs section in FAQ

Verbose log

>>> [youtube] wtTk6KzmhDM: Downloading webpage
[youtube] wtTk6KzmhDM: Looking for automatic captions
[youtube] wtTk6KzmhDM: Downloading MPD manifest
[info] Writing video subtitles to: Q&A - Bioweapons... for Dummies Evaluating the Threat of Rogue Biohacking-wtTk6KzmhDM.en.vtt
[info] Writing video description metadata as JSON to: Q&A - Bioweapons... for Dummies Evaluating the Threat of Rogue Biohacking-wtTk6KzmhDM.info.json
[dashsegments] Total fragments: 175
[download] Destination: Q&A - Bioweapons... for Dummies Evaluating the Threat of Rogue Biohacking-wtTk6KzmhDM.f137.mp4
[download] 100% of 283.86MiB in 04:30
[dashsegments] Total fragments: 187
[download] Destination: Q&A - Bioweapons... for Dummies Evaluating the Threat of Rogue Biohacking-wtTk6KzmhDM.f140.m4a
[download] 100% of 14.09MiB in 01:20
[ffmpeg] Merging formats into "Q&A - Bioweapons... for Dummies Evaluating the Threat of Rogue Biohacking-wtTk6KzmhDM.mp4"
Deleting original file Q&A - Bioweapons... for Dummies Evaluating the Threat of Rogue Biohacking-wtTk6KzmhDM.f137.mp4 (pass -k to keep)
Deleting original file Q&A - Bioweapons... for Dummies Evaluating the Threat of Rogue Biohacking-wtTk6KzmhDM.f140.m4a (pass -k to keep)
[ffmpeg] Converting subtitles
Deleting original file Q&A - Bioweapons... for Dummies Evaluating the Threat of Rogue Biohacking-wtTk6KzmhDM.en.vtt (pass -k to keep)

Description

url1 = 'https://www.youtube.com/embed/wtTk6KzmhDM?feature=oembed&hd=1'
url2 = 'https://www.youtube.com/embed/W-b2n5cUVYU?feature=oembed&hd=1'
url3 = 'https://www.youtube.com/embed/NjhSgxsOOlU?feature=oembed&hd=1'

url11 = 'https://www.youtube.com/watch?v=wtTk6KzmhDM'
url22 = 'https://www.youtube.com/watch?v=W-b2n5cUVYU'
url33 = 'https://www.youtube.com/watch?v=NjhSgxsOOlU'

import os
url = u1

cmd1 = f"""youtube-dl -f "bestvideo[ext=mp4]+bestaudio[ext=m4a]/best[ext=mp4]/best" --write-auto-sub --write-info-json --sub-lang en --convert-subs srt {url}"""  
msg = f"cmd1: {cmd1}"
print(msg)
os.system(cmd1)

The url1 to url3 are youtube embedded links, which crawled from <iframe> tag in a website.
When I run the code using url1, at the end, the srt subtitle, video and info json has been download successful, but the process didn't exit normally, just stop there.
But the same video_id, when I run the code with url11, it do download and exit normally.
WHY?
I wonder if the youtube-dl has a bug when downloading the youtube embedded url.

Looking forward to your reply.

[dstftw]

The log indicates no issues.

[Jokertion]

The log indicates no issues.

The log ensure no problem, but process didn't exit, just stop there!!!

[Jokertion]

When I download the youtube url without embed, it's OK, exit normally.

[dstftw]

You must provide clear evidence of that.

[Jokertion]

This is the code, you should run it, then you'll believe me.

url1 = 'https://www.youtube.com/embed/wtTk6KzmhDM?feature=oembed&hd=1'
url2 = 'https://www.youtube.com/embed/W-b2n5cUVYU?feature=oembed&hd=1'
url3 = 'https://www.youtube.com/embed/NjhSgxsOOlU?feature=oembed&hd=1'

url11 = 'https://www.youtube.com/watch?v=wtTk6KzmhDM'
url22 = 'https://www.youtube.com/watch?v=W-b2n5cUVYU'
url33 = 'https://www.youtube.com/watch?v=NjhSgxsOOlU'

import os
url = url1

cmd = f"""youtube-dl -f "bestvideo[ext=mp4]+bestaudio[ext=m4a]/best[ext=mp4]/best" --write-auto-sub --write-info-json --sub-lang en --convert-subs srt {url}"""  
msg = f"cmd1: {cmd1}"
print(msg)
os.system(cmd)

[dstftw]

No one cares about your code.

> py -3.7 .\youtube_dl\__main__.py -f "bestvideo[ext=mp4]+bestaudio[ext=m4a]/best[ext=mp4]/best" --write-auto-sub --write-info-json --sub-lang en --convert-subs srt "https://www.youtube.com/embed/wtTk6KzmhDM?feature=oembed&hd=1"
[youtube] wtTk6KzmhDM: Downloading webpage
[youtube] wtTk6KzmhDM: Looking for automatic captions
[youtube] wtTk6KzmhDM: Downloading MPD manifest
[info] Writing video subtitles to: Q&A - Bioweapons... for Dummies Evaluating the Threat of Rogue Biohacking-wtTk6KzmhDM.en.vtt
[info] Writing video description metadata as JSON to: Q&A - Bioweapons... for Dummies Evaluating the Threat of Rogue Biohacking-wtTk6KzmhDM.info.json
[dashsegments] Total fragments: 175
[download] Destination: Q&A - Bioweapons... for Dummies Evaluating the Threat of Rogue Biohacking-wtTk6KzmhDM.f137.mp4
[download] 100% of 283.86MiB in 03:05
[dashsegments] Total fragments: 187
[download] Destination: Q&A - Bioweapons... for Dummies Evaluating the Threat of Rogue Biohacking-wtTk6KzmhDM.f140.m4a
[download] 100% of 14.09MiB in 00:12
[ffmpeg] Merging formats into "Q&A - Bioweapons... for Dummies Evaluating the Threat of Rogue Biohacking-wtTk6KzmhDM.mp4"
Deleting original file Q&A - Bioweapons... for Dummies Evaluating the Threat of Rogue Biohacking-wtTk6KzmhDM.f137.mp4 (pass -k to keep)
Deleting original file Q&A - Bioweapons... for Dummies Evaluating the Threat of Rogue Biohacking-wtTk6KzmhDM.f140.m4a (pass -k to keep)
[ffmpeg] Converting subtitles
Deleting original file Q&A - Bioweapons... for Dummies Evaluating the Threat of Rogue Biohacking-wtTk6KzmhDM.en.vtt (pass -k to keep)

>echo %ERRORLEVEL%
0

that proves youtube-dl exits normally.