[FFmpeg-user] New options -preset and -tune for x264 encoding

[Baptiste Coudurier]

Hi Sean,

On 04/19/2011 03:05 PM, sean darcy wrote:
> On 04/19/2011 03:27 PM, Baptiste Coudurier wrote:
>> Hi,
>>
>> On 04/19/2011 08:56 AM, sean darcy wrote:
>>> On 04/16/2011 08:10 PM, Baptiste Coudurier wrote:
>>>> Hi everyone,
>>>>
>>>> Latest git has now added 2 new options for libx264 encoding:
>>>> -preset<preset>
>>>> -tune<tune>
>>>>
>>>> These options are directly mapped to internal tune and presets within
>>>> libx264. The old presets files have been removed, please use the new
>>>> options.
>>>>
>>>> Best regards.
>>>>
>>> How do these new presets work with 2 passes?
>>>
>>> For instance, I have a script that used:
>>>
>>> -pass 1 -vpre slow_firstpass
>>>
>>> -pass 2 -vpre slow
>>>
>>> I've changed it to:
>>>
>>> -pass 1 -preset slow
>>>
>>> -pass 2 -preset slow
>>>
>>> I used to get 100 fps on the 1st pass, now about 70. Is this to be
>>> expected? Or do I need to do something else on the 1st pass?
>>>
>>> Here's the full script:
>>>
>>> ffmpeg -i $INPUT -an -pass 1  -vcodec libx264 -level 30 -preset
>>> slow     \
>>>         -bufsize 10000000 -maxrate 10000000 -b 1200k -threads 0 -f
>>> mp4 -y
>>> /dev/null
>>> ffmpeg -i $INPUT -an -pass 2  -vcodec libx264 -level 30 -preset slow
>>> -timestamp now \
>>>         -bufsize 10000000 -maxrate 10000000 -b 1200k -threads 0 $1.m4v
>>
>> fastfirstpass should be enabled by default.
>> Can you please double check that the parameters printed are the same ?
>>
> 
> I've changed the script a little: slow -> slower, and added -tune film.
> But on pass 1 there's no fastfirstpass.

I don't understand what you mean. fastfirstpass is activated by default
like x264, if you want to disable it use: -fastfirstpass 0.

> BTW, notice "-level 30" on ffmpeg command line becomes Level 3.1 in x264.

-level has not effect when -preset is used.

-- 
Baptiste COUDURIER
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