1) Don't encode in bitrate mode. You'll often find that videos need far less bitrate than you think they do, which will save you a lot of bandwidth. If you need to limit the overall bitrate, run a two-pass CRF encode; use quality mode on the first pass and limit the bitrate on the second pass. If you need to limit the local bitrate, use VBV.
2) For a low-motion video, higher resolution is practically always better. You don't need more than a few hundred kilobits for that sort of thing at SD resolutions.
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