[MEncoder-users] x264 encoding slower after updating libx264

[Grozdan]

On Mon, Nov 16, 2009 at 7:02 PM, James Hastings-Trew <jimht at shaw.ca> wrote:
> Grozdan wrote:
>>
>> On Mon, Nov 16, 2009 at 5:39 PM, belcampo <belcampo at zonnet.nl> wrote:
>>
>>>
>>> Grozdan wrote:
>>>
>>>>
>>>> On Mon, Nov 16, 2009 at 4:13 PM, belcampo <belcampo at zonnet.nl> wrote:
>>>>
>>>>>
>>>>> belcampo wrote:
>>>>>
>>>>>>
>>>>>> Loren Merritt wrote:
>>>>>>
>>>>>>>
>>>>>>> On Sat, 14 Nov 2009, Dâniel Fraga wrote:
>>>>>>>
>>>>>>>>
>>>>>>>> On Sat, 14 Nov 2009, Loren Merritt wrote:
>>>>>>>>
>>>>>>>>
>>>>>>>>>
>>>>>>>>> MB-tree is enabled by default now, didn't exist in api67, and takes
>>>>>>>>> a
>>>>>>>>> bunch of memory.
>>>>>>>>> B-frames and multiref are enabled by default now, weren't in api67,
>>>>>>>>> and
>>>>>>>>> take some memory and cpu-time.
>>>>>>>>> RDO, trellis, and several other options are enabled by default
>>>>>>>>> now, weren't in api67, and take cpu-time.
>>>>>>>>> All of the above also affect filesize.
>>>>>>>>>
>>>>>>>>
>>>>>>>>  And all of these options result in better quality? Because I
>>>>>>>> didn't notice any improvement in the quality... of course I'm just
>>>>>>>> looking at the video (I didn't do any scientific comparison).
>>>>>>>>
>>>>>>>
>>>>>>> All of these options result in better compression ratio. That can be
>>>>>>> either better quality or lower bitrate, depending on what ratecontrol
>>>>>>> mode
>>>>>>> you choose.
>>>>>>>
>>
>> I've no idea about ffmpeg as I don't use it often.... also, about the
>> speed, both weightp and mbtree/rc-lookahead decrease speed a bit.
>
> So... what command line options should be used in mencoder if you
> specifically want the old default behavior? I imagine this probably broke a
> bunch of scripts and application wrappers that use mencoder as well. Fun
> times. Why the need to change the defaults?

Because the defaults were ridiculous (and don't make much sense) which
in a few cases made x264 look pretty bad during third-party testing
who just fired up x264 and didn't change anything.... yeah i know,
blame the testers for being so incompetent but still...

if you want old behavior, disable mbtree and weightp - nombtree and
weightp=0 - and maybe decrease rc_lookahead a bit from its default
value of 40. But both mbtree and weightp can considerably increase
quality, mind you.

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