[MPlayer-users] Re: How to dub a video with mencoder?

[Nico Sabbi]

Giacomo Comes wrote:

>On Wed, Mar 02, 2005 at 04:56:07PM -0500, D Richard Felker III wrote:
>  
>
>>On Wed, Mar 02, 2005 at 10:41:26PM +0100, Dominik 'Rathann' Mierzejewski wrote:
>>    
>>
>>>On Wednesday, 02 March 2005 at 03:37, D Richard Felker III wrote:
>>>      
>>>
>>>>On Wed, Mar 02, 2005 at 01:47:41AM +0100, Dominik 'Rathann' Mierzejewski wrote:
>>>>        
>>>>
>>>>>On Tuesday, 01 March 2005 at 12:33, R C wrote:
>>>>>          
>>>>>
>>>>>>On Tue, 01 Mar 2005 12:15:01 +0100
>>>>>>Tristan Miller <psychonaut at nothingisreal.com> wrote:
>>>>>>
>>>>>>            
>>>>>>
>>>>>>>Can you recommend a program for GNU/Linux that will output OGM
>>>>>>>containers
>>>>>>>              
>>>>>>>
>>>>>>I'm pretty sure ogmmerge is the only one.
>>>>>>            
>>>>>>
>>>>>That is: encode with mencoder to AVI without sound, encode audio
>>>>>          
>>>>>
>>>>Encoding without sound can break a/v sync. You'd be much better off to
>>>>use -oac pcm or -oac copy then throw away the sound in the avi file
>>>>when remuxing.
>>>>        
>>>>
>>>What if you use -noskip and/or -mc 0?
>>>      
>>>
>>No, that just makes the problem worse. -mc 0 is implied anyway by
>>-nosound. You really have to encode some sound in order for mencoder
>>to work right. If you hate this, just resample to 8000 hz 8bit mono
>>pcm and it hardly uses any space or cpu time.
>>    
>>
>
>The needs to encode some sound in order for mencoder to work right
>does apply only to avi or also to mpeg?
>  
>

it's the same: the sync code is in mencoder.c

>Because resample to 8000 hz 8bit mono pcm does not work if you are 
>creating an mpeg (-of mpeg). 
>

both toolame and lavc want 16 bit samples, not 8, and the sampling
rates admitted in  mp2 (maybe even mp3)  are 32/44.1/48 khz IIRC

>I imagine that if I have to encode some 
>audio in the mpeg, I should use a low freq mp2, isn't it?
>
>Cheers
>Giacomo
>  
>

muxer_mpeg  can store mp2, mp3 and ac3, so as long as the sound you send
it is not damaged or incorrect you will hear it