[x264-devel] Re: patch: visualization for X11

[Loren Merritt]

On Tue, 17 May 2005, [iso-8859-1] Måns Rullgård wrote:
> Loren Merritt <lorenm at u.washington.edu> writes:
>> On Tue, 17 May 2005, [iso-8859-1] Måns Rullgård wrote:
>>>
>>> I guess I could read the code and find out, but what is this ABR
>>> anyway?
>>
>> Average bitrate. As close as possible to the 2pass quantizer
>> distribution as you can get in 1 pass. Gracefully degrades to near
>> constant bitrate if you restrict VBV.
>> It's the algorithm I was saying was about 4dB better than CBR (when
>> unrestricted). At small VBV sizes I see around .5 dB gain.
>
> Is the result still within VBV constraints?

Yes. About the same strictness as before, i.e. ~10 frames underflowed in 
the course of a movie. (And they were all I-frames, so I could probably 
improve that by taking complexity estimates from the scenecut detector.)

--Loren Merritt