ffmpeg码率配置

最新推荐文章于 2025-07-04 08:57:46 发布

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最新推荐文章于 2025-07-04 08:57:46 发布 · 5.9k 阅读

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FFmpeg码率配置中，CRF范围在0-51，较低值通常带来更高画质，17-28为主观可接受范围。选择最高仍保持质量的CRF值，如-25、-23。-crf 29与-slowerpreset，-crf 0与-ultrafastpreset组合各有适用场景。-b:v限制码率最小最大值，未指定profile, level会影响清晰度。码率与CRF非线性关联，转码CPU消耗需考虑。" 104991458,9294710,动态分析Android程序：DroidBox与MobSF框架解析,"['android开发', '安全分析', '动态调试', '逆向工程', '移动应用安全']

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官网摘要如下：

The range of the CRF scale is 0–51, where 0 is lossless, 23 is the default, and 51 is worst quality possible. A lower value generally leads to higher quality, and a subjectively sane range is 17–28. Consider 17 or 18 to be visually lossless or nearly so; it should look the same or nearly the same as the input but it isn't technically lossless.
The range is exponential, so increasing the CRF value +6 results in roughly half the bitrate / file size, while -6 leads to roughly twice the bitrate.
Choose the highest CRF value that still provides an acceptable quality. If the output looks good, then try a higher value. If it looks bad, choose a lower value.
-crf 29 -preset slower -tune help
-c:v libx264 -preset ultrafast -crf 0
-profile baseline/main/high/hgin10/hgin422/high444

实验使用命令：

-crf 25 -c:v libx264 -profile:v main -preset:v fast -level 3.1 // ?
-crf 23 -c:v