[MEncoder-users] mencoder skipping frames.

[AaronL]

AaronL wrote:

> 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.
>
>
>
Ok, I tried a couple of new runs with the above command, one with -oac 
copy instead of lame and I get one skip frame for the entire 24000/1001 
progressive section of the video, which is very good, but the whole 
reason, i'm doing the conversion is for a smaller footprint.

My second run I tried the above command with lame, I get about 10 skip 
frames and duplicate frames.  Some of the skip frames are quite 
noticeable in playback.  Would you conclude that I have a buggy lame ?

I have lame 3.95 installed.  Is that a buggy version of lame to use with 
Mencoder?  Is there a recommend version of lame to use?  Lame 3.95 works 
fine for all my other standalone mp3 conversions without any problems.

What else should I try?