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According to an analysis I read recently, lower presets will get you smaller file sizes.
The preset tells your encoder how hard to try to get the quality, so even if it reaches the right quality but still has time to search, it will try find ways to decrease the data required even further.
But there’s an anomaly, sometimes using slower presets (or larger parameters) you will get a larger file size because sometimes with CQ the encoder will search within the parameters you allowed it but couldn’t find enough quality, so it just saves the frame.
But if your parameters are searching far and wide for more options, it can locate tiny pieces of extra quality to fit in and once it finds them, it will use however many bits it needs to fill the target.
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