Libx264 has various preset profiles that determine how fast (and at what compression ratio + quality) it's going to work. I've run a simple, 450KB file through this on a pretty outdated server with an older (v0.6) ffmpeg. Here're the timing results (measured in seconds) for each preset profile ...
- ultrafast: 0.95
- superfast: 1.52
- veryfast: 2.94
- faster: 4.47
- fast: 8.31
- medium: 9.71 (default)
- slow: 15.07
- slower: 31.69
- veryslow: 61.53
- placebo: 145.38
The timing itself is irrelevant (you'll use different hardware and ffmpeg), but the scale isn't. Looking at the numbers you can get a feeling for how each preset relates to the others in respect of speed.
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