[x265] Why does cuTree function calculate the averageDuration by while loop

[Ximing Cheng]

ok, thank you!

On 8/14/15, Steve Borho <steve at borho.org> wrote:
> On 08/14, Ximing Cheng wrote:
>> Hi, the source code in lookahead cuTree function has to calculate the
>> averageDuration by a while loop each time, why not use double
>> averageDuration = (double)m_param->fpsDenom / m_param->fpsNum; in the
>> initial function of lookahead? Thanks!
>
> The cu-tree code was adapted from x264's mb-tree and x264 supports
> variable frame rates. x265 doesn't support VFR yet and so you're right
> we could save some cycles there.
>
> At some point in the future we might add VFR support to x265 so you have
> to weigh possible future work (adding it back) against the compute
> savings.
>
> --
> Steve Borho
>