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Start OBS and open settings. Set the the recording canvas and output canvas to that of the video playback resolution. So if the playback is 1080p, set both to 1080p.
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Set the recording bitrate. This number may needing a bit of tweaking, but the bigger the number, the higher the quality. You will reach a point of diminishing returns depending on the video's resolution, but it's good to do some test recordings and view the clip to check if it's ok. Here is a chart for the standard bitrates:
Type | Video Bitrate, Standard Frame Rate (24, 25, 30) | Video Bitrate, High Frame Rate (48, 50, 60) |
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2160p (4K) | 35–45 Mbps | 53–68 Mbps |
1440p (2K) | 16 Mbps | 24 Mbps |