[x264-devel] X264 dynamic rate control

[Ralf Globisch]

Thanks for the response. 

> Hi.
> Ratecontrol reconfiguration is not possible when using NAL HRD. You
> should see warning:
> "VBV parameters cannot be changed when NAL HRD is in use\n"
> http://git.videolan.org/gitweb.cgi?p=x264.git;a=blob;f=encoder/ratecontrol.c;hb=HEAD#l706

Hmm, I'm fairly certain I didn't see that warning. I'll double check tomorrow on the machine I was testing on.
> Why do you use i_nal_hrd? It is not like you encoding for bluray that
> you need it. Also why do you use X264_NAL_HRD_CBR and not
> X264_NAL_HRD_VBR which imho more effective for network bandwidth
> utilization? If you really want CBR than you can use:
> p.rc.b_filler = 1;
> instead of:
> p.i_nal_hrd = X264_NAL_HRD_CBR;

I don't really want/need CBR, I found a couple of old posts online that recommended CBR over ABR to do adaptive 
bitrate streaming, and then changing the VBV parameters to adapt the bitrate.

What configuration/parameters would you recommend so that I can stream at some bitrate e.g. 200kbps, and then in response to e.g.
network congestion, reconfigure the codec (without closing and re-opening it) to adapt to a different bitrate e.g. 100kbps?



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