[MEncoder-users] audio sync problens when encoding realtime TV

[Roberto Hradec]

Thank you so much man...

I used some your X264/faac settings in my mencoder cmd line and now 
mencoder is making a 100% ITunes compatible mp4 file!!

Just what I need... no more demux/remux crap!! I dont even need to use 
the nicmp4box software... the MP4 from mencoder (latest SVN) works just 
fine in ITUNES!! bye bye sync issues!!

thanks a lot James...

-H

James Hastings-Trew wrote:
> Roberto Hradec wrote:
>   
>> Yeah... my first choice was to save straight to MP4... But the mp4 
>> output of mencoder does not play on ITunes. And thats my problem... I 
>> need to generate ITunes compatible files to publish as podcasts.
>>
>> I endup saving as ASF for no particular reason... I did tests saving 
>> straight to MP4,MPEG, PSP MP4 and AVI from mencoder. All of then save 
>> correclty, with no sync problems (just like asf). But when I try to 
>> remux using mp4creator I get the same problem (just sometimes... again, 
>> the sync problem happens just sometimes when theres loads of frame 
>> droppings).
>>
>> I've being testing this file-format combinations for about 5 weeks 
>> now... its hard because I need to wait for a frame-dropping situation to 
>> check if the file format is holding or not when de-muxing and muxing 
>> back to mp4. All file formats works fine on 80% of the encodings.
>>
>> When you say to use YAMB, what exactly you talking about? is there 
>> something on yamb (mp4box) to fix a mencoder mp4 file without 
>> demuxing/muxing it, to be able to run in quicktime/itunes?
>>
>> maybe I'm missing something here... I would love to encode the video and 
>> just publish it, whitout the need to remux it...
>>
>> -H
>>   
>>     
> Splitting audio and video up and re-muxing them back together is just 
> asking for synch problems. Avoid if possible.
>
> You didn't say if you were doing this on Windows or Linux. There is is a 
> utility called NicMP4Box ( http://nic.dnsalias.com/ ) that will add the 
> iTunes "atom" to the file after MEncoder creates it. You'll also need a 
> couple of other parameters in your MEncoder command line: Here is a 
> skeleton command line that will create a compliant MP4 file that will 
> work in iTunes and the iPod:
>
> |mencoder INPUT -sws 9 -vf scale=640:-10,harddup -oac faac -faacopts 
> br=128:mpeg=4:object=2:raw -ovc x264 -x264encopts 
> bitrate=900:vbv_maxrate=1500:vbv_bufsize=2000:nocabac:level_idc=13:global_header 
> -ofps 30000/1001 -of lavf -lavfopts format=mp4 -o OUTPUT
>
> nicmp4box -add OUTPUT FINALFILE|
>
> You'll need to supply the appropriate -ofps 30000/1001 or -ofps 
> 24000/1001 (depending on the frame rate of your source).
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