[MEncoder-users] ivtc using mencoder

[Late Date]

On 3/28/07, RC <rcooley at spamcop.net> wrote:
>
> On Wed, 28 Mar 2007 10:52:49 -0500
> "Late Date" <latedate at gmail.com> wrote:
>
> > mencoder 24p000.m2t -vf pullup -ofps 24000/1001 -oac copy -ovc lavc
> > -lavcopts vcodec=mpeg2video:vbitrate=24000000:aspect=16/9 -o
> > output.mpg
>
> If you aren't using options like mbd=2 and trell, you're just wasting
> bits for no reason.



Good to know :-)  I admitted from the very start that I know next to nothing
when it comes to mencoder.  My goal is to come up with a way to turn a
captured 24P stream which is in the 60i (pulldown) format into a true 24P
format (as close to lossless as possible) .

And thanks to the generous help from the folks on this list, I at least have
*something* :-)  Here's what I have so far:

mencoder 24p000.m2t -noskip -vf pullup -ofps 24000/1001 -oac copy -ovc lavc
-lavcopts vcodec=mpeg2video:vbitrate=24000000:aspect=16/9:mbd=2:trell=yes
-of mpeg -mpegopts format=mpeg2:tsaf:vbitrate=25000:vframerate=24000/1001 -o
output.mpg

I added the mdb=2 and trell=yes options.  I'm almost 100% sure that there
are still mistakes, ambiguities, contradictions, etc.




>  I wonder if I have the "correct" bitrate setting.  The
> > original bitrate was: 25000.0 kbps (3125.0 kbyte/s)
>
> Are you sure that's the actual bitrate, and not just what's reported in
> the header?



I have no idea.




> Is there any way I can "bump up" that bitrate :-)
>
> > I imagine I will have to dump it into a raw stream; if I do that, will
> > I suffer any loss in picture quality?
>
> If the IVTC filter does it's job perfectly on the video, then it should
> be lossless.  But I'm willing to bet pullup (or any other MPlayer
> filter) will be slightly less than perfect.
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