Quota

YouTube has no built-in way to copy a playlist or create one from all the videos on a channel, so Playlist Mirror uses the YouTube Data API to provide that missing feature. Access to the API comes with a daily quota: a channel with hundreds of videos can take several days to copy, and a naive tool has no memory of where it got to. This page explains how the app accounts for it.

The numbers

• The YouTube Data API v3 grants a per-project daily allocation, 10,000 units by default, resetting at midnight Pacific Time.
• playlists.insert (creating the playlist) and each playlistItems.insert (adding one video) each cost 50 units.
• playlists.list / playlistItems.list calls cost 1 unit; a search.list call costs 100 units.

At the default 10,000-unit allocation, a playlist mirror adds roughly ~198 videos a day. A 600-video channel needs about 3 days. The app computes this up front, before creating anything, so you know what you're starting.

It's an estimate, and the app says so

The YouTube Data API publishes no "remaining quota" endpoint. Every figure the app shows is a local projection: units it has charged itself since the last reset, subtracted from the configured daily limit (QUOTA_DAILY_LIMIT, or whatever you've set on the Account page). The authoritative signal is always the API's own 403 quotaExceeded response, which overrides anything computed locally — if YouTube refuses a call, that day's credits are gone whatever the local tally says.

Reserve

QUOTA_RESERVE (default 50 units) is held back so a run never spends the last of the day's allocation on an insert it can't confirm succeeded. Set it to 0 to spend the allocation down to the floor.

Reset timezone

QUOTA_RESET_TZ (default America/Los_Angeles) controls when the app considers a new day to have started. Google's own reset is midnight Pacific — change this only if you have reason to believe it drifts from that.

If the printed reset clock ever disagrees with Google's real one — for example because the container has no tzdata, or the timezone is misconfigured — the app lets you manually rule today's count off early with Reset the count, rather than waiting for a possibly-wrong computed midnight.

Multiple tools, one project

Don't point another tool at the same Google Cloud project as Playlist Mirror. The app can only count its own calls — a second tool's spending makes the remaining-quota figure read higher than the truth, and playlist mirrors hit the wall earlier than predicted.

Raising the limit

If Google has granted your project more than 10,000 units a day, set the real figure on the app's Account page (or seed it via QUOTA_DAILY_LIMIT). It takes effect on the next video, no restart required.