[x265] Dynamic rate control
Ralf Globisch
rglobisch at csir.co.za
Wed Oct 14 17:30:06 CEST 2015
> 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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