[MEncoder-users] B-frames and GOP with MPEG-2 for DVD

[Nicolas Hesler]

Nico Sabbi wrote:
> Nicolas Hesler wrote:
>   
>> Nico Sabbi wrote:
>>
>>     
>>> Nicolas Hesler wrote:
>>>
>>>  
>>>
>>>       
>>>> Really??? Good to know.
>>>>
>>>> So, get rid of the vb_strategy thing too? This doesn't affect the GOP on 
>>>> 2pass without B frames right?
>>>>
>>>>    
>>>>         
>>> vb_strategy affects only the placement of b-frames, and it's damn slow too
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>>>       
>> So why have a b frames option in the first place, if it only degrades 
>> the quality?  For smaller encodes? 
>>     
>
> supposedly for encodes targeting a low bitrate, but even in cases like 
> that I've only seen overall image degradation with b-frames, both with 
> lavc and with xvid, at any bitrate
>
>   
>> So as a rule, never use B-Frames unless you're concerned with space?
>>     
>
> I never use b-frames _at_all_ , although with x264 b-frames maybe 
> aren't so harmful (or maybe they are even beneficial, but I never 
> tested the encoder extensively to say for sure)
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>   
Thank you very much for all of your help.