Quantizer matrices

[Witzig]

I've experienced quantizer matrices to be very useful in some situations, though it seems like an underrated feature and so not many are to be found on the internet.

What quantizer matrices have you come across that might come in handy?

[mandarinka]

Check this thread: http://forum.doom9.org/showthread.php?t=124755

Not sure if they come in handy. I've tried Prestige once and while it looked like it could help a tiny bit at first, I think I ruled that out in later experimenting. With RDO and trellis going on in x264, these things have limited effect and question is if they don't actually hurt. Maybe try that CCE-HD matrix at the end of the thread, that might be interesting experiment.

[Lyris]

I've never heard of anyone using custom quant matrices being able to explain why they're better, it's always struck me as a "scratch and sniff" situation with a heavy dose of confirmation bias.

That said, I did encode one movie where using the JVT matrix rather than x264's default reduced mosquito noise in one scene. It's not something I routinely adjust myself though.