How do I use the YouTube Data API to upload video to secondary channel on personal account - youtube-api

Question

I have looked around Stack Overflow and seen a few posts about this but none of the solutions help.
I have a Google account which I use in YouTube. I have created a second channel on that YouTube account so that I can upload videos with a specific theme to separate them from the main videos.
Trying to use the Google API to upload the videos so that I can run it via a Python script, I keep hitting brick walls with Google who is looking for app verification, privacy policies and web page links - none of which I have.
This application is a Python script that's not available to the public and doesn't gather any public information. All I am trying to do is upload videos to my own personal YouTube account.
So I'm beginning to think it is something else I should be using rather than the API (the uploading web page isn't suitable for use in a script).
My two question are:
Can I use the YouTube API to upload a video directly to the second channel on my personal YouTube account?
Is there another simpler mechanism I should be using to upload videos via a script to my personal YouTube account? The reason I have to do it via script is that the device is unattended.
Thanks,
David

Answer 1

You have to acknowledge that each and every app (this to be understood in a broad sense that includes even a small script like this one from Google upload_video.py) must be verified and approved by Google prior to be able to make videos publicly available via the YouTube site.
Answer to question no. 1: yes, that is perfectly possible.
As part of the OAuth 2.0 authentication/authorization flow, you will be presented, within the browser, with the option of selecting to which account your app is to be given access rights.
You may well exercise this behavior, prior to making use of your script, with the help of Google Developers OAuth 2.0 Playground.
Upon a successful OAuth flow, you may verify (and also revoke) the permissions granted by your account on the account's permissions page.
Answer to question no. 2: no, there's no way to upload programmatically videos on YouTube that's in compliance with YouTube's DTOS, other than using the Videos.insert API endpoint.
Addendum
Since by now you have at least two credentials sets, it may be of need to know to which of your YouTube channels a given credentials object is associated.
If using the Google APIs Client Library for Python, you may easily obtain from the API the channel ID to which a given credentials object CREDENTIALS is associated by issuing a call to the Channels.list API endpoint, passing to it the parameter mine as mine=true:
from googleapiclient.discovery import build
youtube = build(
'youtube', 'v3',
credentials = CREDENTIALS)
response = youtube.channels().list(
mine = 'true',
part = 'id',
fields = 'items(id)',
maxResults = 1
).execute()
channel_id = response['items'][0]['id']
Note that the code above uses the fields request parameter for to obtain from the Channels.list endpoint only the channel's ID info (it is always good to ask from the API only the info that is of actual use).
A caveat using the above procedure is the following: if a given CREDENTIALS instance has its scopes containing only:
https://www.googleapis.com/auth/youtube.upload,
then the API will respond with an error of type insufficientPermissions and of message Request had insufficient authentication scopes.
For to invoke successfully the Channels.list it would be sufficient that the scopes attached to CREDENTIALS to include either of the one below:
https://www.googleapis.com/auth/youtube.readonly,
https://www.googleapis.com/auth/youtube.