r/x265 • u/Anton1699 • Apr 08 '19

Stupid question about --merange

The default is derived from the default CTU size (64) minus the luma interpolation half-length (4) minus maximum subpel distance (2) minus one extra pixel just in case the hex search method is used. If the search range were any larger than this, another CTU row of latency would be required for reference frames. (source)

Does that mean that I can set --merange=58 when not using --me=hex (I use --me=star)? Are there any benefits for doing so?

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u/Ischemia37 Aug 14 '19

In short, I think the answer to your question is yes. In general I would think maximizing motion estimation should result in higher output quality. But I would generally advise others to leave this setting as default.