[XviD-devel] [Feature Request] Global first and second passes

[BAHASSINE Abdallah]

I simply dont understand how an encoder software like Virtualdub could 
do this when XviD codec cant stores a "multi first passes file".
I think all the files should be "1st passed" first, before defining 
which bitrate will be used for each file.
> Again, this is NOT XviD's problem.
> You should be asking this feature at an encoder or media player mailing list.
>
> It's like asking a dentist to solve your heart problems or vice vesa. They're both doctors, but it doesn't mean they do the same.
>
> Your problem is completely valid and has a solution, but not in XviD mailing lists.
>
> Cheers
> Dark Sylinc
>
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> --- El lun 8-feb-10, BAHASSINE Abdallah<abdallah at gmx.com>  escribió:
>
>    
>> De: BAHASSINE Abdallah<abdallah at gmx.com>
>> Asunto: Re: [XviD-devel] [Feature Request] Global first and second passes
>> Para: xvid-devel at xvid.org
>> Fecha: lunes, 8 de febrero de 2010, 5:43 pm
>> I know I can merge all the AVI files
>> into one big file but if i have to
>> put some subtitles after 2min of each episode then this
>> solution comes
>> unworkable.
>> I think XviD should remember for each pass a "segment
>> number with its
>> name" (like ep01.avi) " and it should be able to output one
>> of the
>> desired segment using a desired total size + the global
>> first pass file.
>>
>>
>>      
>>> Hi,
>>>
>>> I don't think this is something that should be done in
>>>        
>> xvid. This should be
>>      
>>> handled by the application (perhaps as an extension to
>>>        
>> a batch-processing
>>      
>>> feature) or implemented as a seperate tool.
>>>
>>> So what would be needed is a tool that can open
>>>        
>> multiple first pass stats
>>      
>>> files, asks for a global desired size and then outputs
>>>        
>> the optimal file
>>      
>>> sizes that should be used for the single "segments"
>>>        
>> during second pass.
>>      
>>> Another option would be to simply encode the multiple
>>>        
>> episodes as one large
>>      
>>> video and cut the resulting file into pieces
>>>        
>> afterwards. Under windows, you
>>      
>>> can easily concatenate multiple source files so that
>>>        
>> they are opened as one
>>      
>>> long video with avisynth:
>>>
>>> DirectShowSource("test_001.avi",fps=25)+\
>>> DirectShowSource("test_002.avi",fps=25)+\
>>> ...
>>> DirectShowSource("test_020.avi",fps=25)
>>>
>>> You'd then run just one first-pass (over all your
>>>        
>> source files at once),
>>      
>>> then one second-pass (setting your desired overall
>>>        
>> target size) and finally
>>      
>>> cut the resulting avi file into individual avi files
>>>        
>> (e.g. using VirtualDub).
>>      
>>> Regards,
>>> Michael
>>>
>>>
>>> Quoting BAHASSINE Abdallah<abdallah at gmx.com>:
>>>
>>>
>>>        
>>>> Hi @ all !
>>>>
>>>> Sometimes I have to encode a ~26 files pack
>>>>          
>> (episodes) and define a
>>      
>>>> total size (4.7GB). Actually I define a "static"
>>>>          
>> file size (eg. 4700 /
>>      
>>>> 26 = 180MB per file).
>>>> But this is not really optimized for obtaining a
>>>>          
>> constant quality
>>      
>>>> because some episodes needs more bitrate than
>>>>          
>> other ones.
>>      
>>>> This is why I think there is a needed feature on
>>>>          
>> XviD we could call
>>      
>>>> "segmented passes" or "global pass".
>>>>
>>>> We need the ability to concatenate a "first pass
>>>>          
>> file" with another
>>      
>>>> "first pass file" and then we will be able to
>>>>          
>> define a global size for
>>      
>>>> all the segments (4700 MB).
>>>> Then @ second pass, XviD encoder will have to read
>>>>          
>> our "big first pass
>>      
>>>> file" and output these segments.
>>>>
>>>> example :
>>>> - 01.avi (190MB)
>>>> - 02.avi (150MB)
>>>> - ....
>>>> - 26.avi (200MB)
>>>> TOTAL : 4700 MB
>>>> _______________________________________________
>>>> Xvid-devel mailing list
>>>> Xvid-devel at xvid.org
>>>> http://list.xvid.org/mailman/listinfo/xvid-devel
>>>>
>>>>
>>>>
>>>>          
>>>
>>> _______________________________________________
>>> Xvid-devel mailing list
>>> Xvid-devel at xvid.org
>>> http://list.xvid.org/mailman/listinfo/xvid-devel
>>>
>>>        
>> _______________________________________________
>> Xvid-devel mailing list
>> Xvid-devel at xvid.org
>> http://list.xvid.org/mailman/listinfo/xvid-devel
>>
>>      
>
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