Ffmpeg h264 quality1/12/2023 ![]() ![]() ![]() If it helps here is a git diff from slower to veryfast. This means that a slower preset with the same CRF value will improve quality per bitrate, but might make both quality and bitrate higher or lower. Similar question to yours with answers provided by one of the x264 developers: verb3k | Do different presets have an effect on quality when used with | verb3k: yes, but not too | a 0th-order approximation is that they have no | The main reason there's a difference is because the preset affects how x264 itself measures | that is, it uses better, more accurate methods of measuring | obviously, this will affect the definition of what -crf | It's just not too much, so we can mostly ignore | specifically, there are three big things that can affect the definition of | 1) AQ being | jump: ultrafast to | 2) mbtree being | jump: superfast to | 3) psy-rd being | jump: faster to | above fast there are no more big jumps. Here's an excerpt from a discussion on #x264. Yes, quality may vary slightly depending on the preset used, but it should not be a significant amount. ![]()
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