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Google rejects a YouTube video it cannot ingest with a generic `400 INVALID_ARGUMENT` that names no cause, which LibreChat relayed verbatim. Attribute the failure using request context instead: when a Google/Vertex turn carried an injected YouTube video part and the provider returns that generic rejection, map it to a typed error the client localizes. Verified against the live API: a public 9h15m video is refused this way on gemini-2.5-flash, 3.5-flash, 3.5-flash-lite and 3.6-flash, including at MEDIA_RESOLUTION_LOW, while a short video with an identical payload succeeds. Duration is the dominant trigger; region and access restrictions return the same response, so the copy leads with length without overclaiming. A duration preflight was evaluated and skipped: oEmbed does not expose duration, leaving only watch-page scraping — a blocking call against undocumented markup from rate-limited datacenter IPs that would fail open and still need this mapping underneath. |
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