[MEncoder-users] encoding multimedia files to dvd video

Dave dmehler26 at woh.rr.com
Sun Sep 9 00:38:28 CEST 2007


Hi,
    Thanks for your reply. I am definitely seeing skipped or duplicate 
frames during encoding. Is this bad?
Dave.

----- Original Message ----- 
From: "Moritz Barsnick" <barsnick at gmx.net>
To: "mencoder usage discussions" <mencoder-users at mplayerhq.hu>
Sent: Saturday, September 08, 2007 1:42 PM
Subject: Re: [MEncoder-users] encoding multimedia files to dvd video


> Hi Dave,
>
> On Sat, Sep 08, 2007 at 12:32:25 -0400, Dave wrote:
>
>>     Thanks for your reply. The issue is i keep getting somewhat jerky 
>> video,
>> like it jumps.
>
> Do you see any reports of skipped frames during encoding?
>
>> THe only addition was the -channels 6 which i hope will convert from
>> stereo to 5.1 surround sound audio.
>
> Not sure, sorry.
>
>> The fps is right for ntsc, but aspect might not be, it is 16/9, in
>> the below, isn't that for wide screen? Shouldn't that be 4:3?
>
> Well, DVD supports display aspect ratios of 4:3 and 16:9, plus
> consideration of whatever black content you add at the borders. If your
> source material is neither exactly 4:3 nor 16:9, you will have to
> expand and scale (-vf) appropriately (also considering that you
> additionally need to stretch to 3:2 for 720x480) for it to display
> correctly.
>
>> And the abitrate option at 192, i've seen 224 and i believe 480 for 6
>> channels, is 192 the correct value?
>
> The audio bitrate influences the quality of encoding - and you are
> definitely re-encoding audio here. Anything valid is "correct", it's
> upto your ears to say it's sufficient. It depends on the quality you
> expect (e.g. you might not notice the difference with low quality sound
> on a mobile player). For two channel audio, 128k or 192k may be
> sufficient for MP2, though I tend to choose more. I have no experience
> with values for AC3 and multi-channel sound.
>
> HTH,
> Moritz
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