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Bitrate is the amount of data processed per second in a video file. It is the single most important factor determining video quality and file size.
Note: Newer codecs like H.265 (HEVC) or AV1 are more efficient and can achieve similar quality at 30-50% lower bitrates.
For Twitch/YouTube, 6,000 Kbps (6 Mbps) is the standard recommendation for 1080p 60fps streaming. For 1080p 30fps, 4,500 Kbps is sufficient.
Up to a point. Once you exceed the efficiency of the codec or the resolution limits, higher bitrate yields distinguishingly diminishing returns while massively increasing file size.
File Size = (Bitrate x Duration) / 8. Remember to convert units carefully (Bits to Bytes).
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