[MEncoder-users] compression test

[Tobias Brockamp]

I have another question on this topic. In applications like Staxrip  
or GKnot the Compcheck
is used to take the resolution as a variable to get a certain quality  
with a fixed target size.

My idea is to take the bitrate as a variable to get a comparable  
quality for different video styles
with a fixed resolution. i need this for a batch encoding program. Am  
i right that this way would
be better for saving bits than using a fixed quantizer?
Am 18.10.2007 um 16:39 schrieb Tobias Brockamp:

> Am 18.10.2007 um 16:30 schrieb Tobias Brockamp:
>
>> Can someone tell me the formular how i get the quality value in % for
>> the
>> specific video file?
>
> sorry, i get by myself. just a little bit confused for a moment :-)
>
>>
>> Am 18.10.2007 um 01:45 schrieb Michael Rozdoba:
>>
>>> Tobias Brockamp wrote:
>>>> Am 17.10.2007 um 22:04 schrieb Guillaume POIRIER:
>>>>
>>>>> On 10/17/07, Tobias Brockamp <tobiasbrockamp at gmx.de> wrote:
>>>>>> hi,
>>>>>>
>>>>>> is there a way to make a compression test with mencoder like  
>>>>>> it is
>>>>>> implemented f.e. in stax rip or gordian knot?
>>>>>>
>>>>>> these tools take 5% off the video footage and outputs a quality
>>>>>> value
>>>>>> in % for the given target size, this is how i understand it.
>>>>> tuxrip is a script that uses mencoder and does what you are
>>>>> requesting.
>>>>
>>>> thanks, looks good. i hope i can easily port this to windows.
>>>
>>> If you have any problems, as you're using Windows why not make  
>>> use of
>>> AviSynth? SelectRangeEvery(300,15) or similar is the function you're
>>> after. Then run that through MEncoder with the codec set to give a
>>> constant high quality with few, if any, restrictions on quantisers.
>>> The
>>> resulting compression ratio should be a rough guide to
>>> compressibility
>>> of that source by that codec. E&OE.
>>>
>>> -- 
>>> Michael Rozdoba
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>>
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