What is INT_MAX value in ffmpeg?

llamafilm · December 11, 2020, 9:14pm

This maybe a naive question, but could someone please tell me what is the value of INT_MAX as it relates to nvenc? In ffmpeg, the nvenc documentation makes lots of references to this, for example:

-rc-lookahead E…V… Number of frames to look ahead for rate-control (from 0 to INT_MAX) (default 0)

If this refers to the x64 architecture then the value would be 2⁶³-1. But it would be ludicrous to use that number of frames for lookahead. So what does this actually mean?

val.zapod.vz · February 7, 2021, 8:54am

Type int on 64 bit systems is usually 32 bits. So the macro INT_MAX is 2147483647.

llamafilm · February 8, 2021, 2:52pm

Okay thanks. I think you’re technically right, but I was trying to figure out what is the realistic maximum. I didn’t try it, but surely no GPU has enough memory to actually look ahead that huge number of frames…