[MEncoder-users] mencoder skipping frames.

[AaronL]

Rich Felker wrote:

>On Tue, Jul 26, 2005 at 09:38:06AM -1000, AaronL wrote:
>  
>
>>Rich Felker wrote:
>>
>>    
>>
>>>On Thu, Jul 07, 2005 at 08:14:28PM -0500, Mike Hodson wrote:
>>>
>>>
>>>      
>>>
>>>>try -vf filmdint, -fps 29.970 -ofps 23.976
>>>>this should force input fps to be treated as 29.97 with a telecine,
>>>>and the filmdint plugin will take it down to progressive 24fps aka
>>>>23.976. i've had good luck with these options before.
>>>>  
>>>>
>>>>        
>>>>
>>>-fps should not be used for cases like this. it will either do nothing
>>>or cause a/v desync. second, 29.97 and 23.976 are _wrong_. the numbers
>>>are 30000/1001 and 24000/1001.
>>>
>>>and... please do not top post!
>>>
>>>rich
>>>
>>>
>>>
>>>      
>>>
>>Sorry for the long discontinuity.  It's been a while since I have time 
>>to do some more tests.  So far I've tried "-mc 0" and the skip frame 
>>problem goes away but that causes a/v desync.
>>I've also tried "-vf pullup,softskip" and this still cause skip frames.
>>
>>Finally, I tried using the "-vf filmdint" option, but the video still 
>>skips frames.  Here's my command line.
>>
>>mencoder dvd://1 -fps 30000/1001 -ofps 24000/1001 -oac mp3lame -lameopts 
>>    
>>
>                   ^^^^^^^^^^^^^^^
>Did you read what I said above? DO NOT USE -FPS! EVER! Unless you
>understand what it does.
>
>  
>
>>abr:br=128 -vf filmdint,crop=720:352:0:62,scale=576:240 -ovc lavc 
>>-lavcopts vcodec=mpeg4:vbitrate=768:v4mv:mbd=1:aspect=2.4:vpass=1 -aid 
>>128 -o output.avi
>>
>>It looks like mencoder is trying to keep a/v sync by skipping frames, 
>>but forcing mencoder to not skip frames cause a/v desync...i don't know 
>>what else to try...am I the only one with this problem?
>>    
>>
>
>Well you're mixing different problems. Try the above command line with
>-fps nonsense removed and with -oac copy and see if the a/v desync
>goes away. If so, try with lame. If a/v sync is back, it's a bug in
>lame and you can work around it with splitting the audio and video and
>remuxing after encoding.
>
>Rich
>
>  
>
Opps, sorry.  I forgot to mention that I also tried it without the -fps 
nonsense and it still skips frames.  The command above does not cause 
a/v desync.  My problem is noticeable skip frames in the video.  I'll 
try the above command again without the -fps and with -oac copy and see 
what happens.