[x265] Dynamic rate control

[Ralf Globisch]

> The "Video Buffer Verifier" is a system to tell the encoder the maximum  
> capacity of a decoding buffer and the maximum speed this buffer can be  
> filled. In consumer players, it relates to the capacity of RAM built in to  
> use as the decoding buffer (for DVD Video players, it used to be 224 KB =  
> 112 DVD sectors with 2048 bytes each) and "1x" DVD drive reading speed  
> (9.8 Mbps data netto). Blu-ray has a considerably higher capapcity and  
> limit values, just don't remember without searching... Guides for x264  
> recommend '--vbv-maxrate 40000 --vbv-bufsize 30000'.

> In case of network streaming, you can define both vbvMaxRate [kbps] to the  
> estimated available bitrate in your network (maybe with some overhead, *  
> 0.9), and vbvBufferSize [kbit] to the amount of data required to fill a  
> buffer for a desired number of seconds (e.g. 5 s * vbv_maxrate). This may  
> guide the bitrate control more certainly to stay in the range you need;  
> but it will take time to adapt, if it works at all...

> No warranties.

Mario, thanks for the detailed explanation. I'll give that a try.
Cheers,
Ralf




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