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sinsanction avatar sinsanction commented on August 17, 2024

看起来是 x265 改了默认值但没有更新文档,建议向 x265 提 issue

通过 x265 -h 可以看到:
--qg-size 默认值为 32,实测也是如此

--limit-refs 默认值为 1,实测也是如此。不过这个不完全准确,实际上 preset 会改这个值,默认 preset medium 现在是 limit-refs=1,而它降一级 preset fast,仍然 limit-refs=3

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dtlnor avatar dtlnor commented on August 17, 2024

补充一点,qgsize引入的时候(大概9年前吧)默认值设置为了64(但会根据preset变动),然后备注了一句same as maxCUSize(实际只是数值一样而已)。并非qgsize的默认值==ctu。所以qgsize的 default 实际上跟其他参数无关。
而目前的代码如楼上所说,已经改为了32了(无论哪个preset)。
而当qgsize超限的时候,你会看到 x265 的 log 里面有 warning 提示你他把你的qgsize值改动到了合法范围内了

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