Feature request: faster upload detection (RSS/API), delayed SponsorBlock re-checks, and alerts when a video is edited or removed #968

Hi @dialmaster and everyone working on Youtarr,

First of all, thank you for this project. The pace of development, the documentation and the care that goes into every release are genuinely impressive.

My use case: I subscribe to a set of channels and want every new upload to land in my Jellyfin library as quickly as possible, ideally ad-free, so I can watch it offline on my TV. Four additions would make Youtarr the perfect tool for this, and I believe this combination would set it apart from everything else in this space.

1. Faster detection of new uploads

Right now, channel checks run on a cron schedule (hourly by default) and each run scans channels with yt-dlp. Running that every few minutes across many channels is heavy and risks rate limits.

Idea:

• Poll each channel's YouTube RSS feed (https://www.youtube.com/feeds/videos.xml?channel_id=...) or the YouTube Data API (with an optional user-supplied API key) every few minutes. Both are lightweight and would only trigger a yt-dlp download when a new video ID appears.
• Optionally support YouTube's WebSub (PubSubHubbub) push notifications for near real-time detection, for setups with a reachable callback URL.
• Keep the full yt-dlp scan as a less frequent safety net.

2. Download now, remove sponsors later

SponsorBlock segments are submitted by the community, so minutes after an upload there usually aren't any yet. Downloading fast and removing sponsors currently work against each other.

Idea:

• After the first download, re-check SponsorBlock for that video at configurable intervals (e.g. after 6 h, 24 h and 72 h).
• When new segments appear, either cut them from the existing file with ffmpeg (no re-download needed) or re-download the video.
• Stop re-checking after a configurable window.

3. Show which segments were or will be removed

Store the SponsorBlock segments per video and show them in the video details (category, start/end, already cut or not). That way I can start watching right away and still know which parts are or will be removed. Using "mark" (chapters) on the first download and switching to "remove" once segments are confirmed would be a great combination.

4. Alert when a video is edited, made private or deleted

I noticed Youtarr already checks whether downloaded videos still exist on YouTube, which is great. Building on that:

• During a configurable watch window after download (e.g. 14 days), check each new video regularly on a schedule.
• Detect when a video is deleted, made private/unlisted, or edited (for example when its duration changes).
• Send an Apprise notification and show a badge/filter in the UI.
• Never automatically replace the original file with the edited version: keep the original (or keep both).

Background: creators sometimes have to cut or remove a video after a strike. I'd like to keep the original version I downloaded and simply be informed when that happens.

I run Youtarr on Unraid with Jellyfin and would be happy to test any of this. Do you think something like this could fit Youtarr's direction?

Thanks again for all your work!