[MPlayer-users] mencoder/xvid: issues with forced PAR using a DXN profile

[Jarek Czekalski]

  My problem with xvidenc through mencoder was the lack of ability to 
control tff/bff flag in interlaced encoding. You seem to lack the 
ability to control pass2->vbv_peakrate. You can introduce your own 
switch as I did. It's not a hard task and you can find my solution on 
mplayer-dev list.

I can imagine that I could run into your problem when encoding videos 
from camera, at high bitrate. When I encode from tv on 900 kbps I don't 
come close to any bitrate limit.

W dniu 10/05/2010 03:49 PM, Daniel Klaffenbach pisze:
> On Monday 04 October 2010 19:12:20 Jarek Czekalski wrote:
>>    Looks like there is a problem in xvidenc. It goes like this:
>>
>>       if( !(selected_profile->flags&  PROFILE_DXN) )
>>       {/* here is par being set in different manners */...}
> I've noticed that. My current workaround is to remove this check in the
> sourcecode and recompile mplayer.
>
>> So choosing a DXN profile leads to par11 as you have discovered. Maybe
>> you should try to set the encoding parameters by hand: interlacing, max
>> bvop=1, without choosing a profile. That may be a workaround.
> The main reason I am using the profile is to keep the peak bitrate below 8
> Mbits. Since I am using two-pass encoding with a specified target size (3,9
> GiB) I need some way to limit the peak bitrate and using a DXN profile seems to
> be the only option I have in this case.
>
> Or is anyone aware of any other options to limit the XviD peak bitrate with
> mencoder? I am *not* talking about the average bitrate.
>
>> My experience with fixing xvid encoding problems with mplayer team is
>> negative, so I doubt they will do anything about it. Especially when it
>> regards interlacing encoding, as the profile dxnhtpal does.
> It seems like a custom PAR is only supported by DivX 6.7 or higher. All of my
> hardware players support this version - this is why I think the best way to
> deal with this issue would be adding additional profiles such as "dxnht7pal",
> which would allow users to set a custom PAR value.
>
>
> Regards,
> Daniel
>
>
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