[MEncoder-users] x264 encoding slower after updating libx264

[Grozdan]

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.
>>
>> So if I understand correct, given a constant quality, it would result in a
>> smaller file ?
>>>
>>> --Loren Merritt
>>>
>>>
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>>>
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>
> I did some testing with current ffmpeg/x264 in comparison with ffmpeg
> SVN-r17923/x264-65
> convert 400frames from BBC-HD source to 720x576
>
> Current version
> [libx264 @ 0x8a537d0]frame I:5     Avg QP:22.00  size: 38218
> [libx264 @ 0x8a537d0]frame P:395   Avg QP:22.00  size:  6277
> size 2670643
> time 0:30.10
> Memory use 155m  95m ffmpeg
>
> SVN-r17923/x264-65
> [libx264 @ 0x89fc430]slice I:5     Avg QP:22.00  size: 38065
> [libx264 @ 0x89fc430]slice P:395   Avg QP:22.00  size:  6565
> size 2784070
> time 0:25.31
> Memory use 94428  42m ffmpeg
>
> Indeed size is better by 4.08%
> But time is worse by almost 19%
> Memory needed more than doubles

That's because of mbtree... it needs pretty much a lot of memory, even
more so when you increase rc_lookahead

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