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>what's the difficulty in splicing in some additional frames at upload or request-time?

Are you aware of the CPU overhead and lag time involved with just "splicing in some additional frames" to a video file within the context of an HTTP request cycle?

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obviously it's not going to be free, I was more curious what made it specifically 'more difficult than video'.

I'd hope there would be some opportunity for caching to make it a bit cheaper than every single request, but maybe with dynamic targeted or real-time ad bidding that wouldn't work so well.

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