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Old 27th February 2021, 13:25   #1  |  Link
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Join Date: Jan 2021
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Does x264 have the algorithm about deciding the inital qp?

I have found that there are many papers about deciding the initial qp. But after reading the source code, I did not fount anything about it in x264.

I read the paper, it says the initial qp depends on the levels of bit per pixel.

Could you please tell me whether you have found this algorithm or not?
If it doesn't, why not?

Thank you!
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Old 5th March 2021, 09:41   #2  |  Link
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Join Date: Jan 2006
Location: Slovakia
Posts: 201
No idea what paper you're talking about, but initial QP very much depends on what ratecontrol mode; you probably want to search for MBtree algorithm.
fevh264 - open-source baseline h.264 encoder
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initial qp, rate control, x264

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