x264 - warning about DPB size

[paviko]

Hi!
I'd like to archive my familiy clips for future viewing using x264. I'm compressing 1440x1080 50fps movies at 16 Mbps. I want them to be restricted to level 4.2, which is the highest (or lowest, don't know how to name it) that allows this kind of resolution and frame rate. I'm constantly getting this warning in the comand line console :(:
"x264 [warning]: DPB size (18800640) > level limit (13369344)"
How can I change DPB size so it conform to level 4.2 ? I haven't found any option. Compressing 1440x1080 25fps also is giving me this warning.

Thank you for help.

[foxyshadis]

I think it means you're using too many reference frames, since the dpb is where those are stored. Try using 5 refs instead of 8 (quick guess?). But I'm no akupenguin, I might be wrong!

[shon3i]

Did you convert to YV12 colorspace

[foxyshadis]

Yes, shon3i, x264 displays an error message about "Unsupported input format" and will not continue if you use any other colorspace. It's impossible to get any other error.

[Oline 61]

You might try a higher level, or even unrestricted unless you have a specific reason to use 4.2.

[paviko]

Thanks for replies.
I'm using 5 B-frame refs. Hmm... strange. I've thought it's still a bit low. Is it safe going lower ? Will try it when I'm at home.

You might try a higher level, or even unrestricted unless you have a specific reason to use 4.2. I want to restrict it to the lowest level, so there is higher chance it will be playable later by harware players. I hope I'll need only to mux/remux the files and not recompress. Level 4.2 is allready very high and probably won't be playable in 2-3 years.

Thank you