[MEncoder-users] Problems when creating video dvd

[Giacomo Comes]

On Mon, Jan 16, 2006 at 07:26:55PM +0200, Oded Shimon wrote:
> On Mon, Jan 16, 2006 at 06:21:17PM +0100, Guillaume POIRIER wrote:
> > Hi,
> > 
> > On 1/16/06, Sebastian <sebastian_ml at gmx.net> wrote:
> > > On Mo, Jan 16, 2006 at 12:39:04 -0400, Giacomo Comes wrote:
> > > > Using -nosound is also a bad idea. In order to test stuffs (options,
> > > > dvdauthor, mplex, etc) I would suggest you to encode only a small
> > > > portion of the movie. You can use -frames 10000 in order to encode
> > > > few minutes. Test the results and when you have found a working
> > > > command line, encode the whole movie.
> > >
> > > You're right, will do. I just get this feeling that this is all about
> > > "harddup". I left it out because I didn't see it in the guide ->
> > > http://www.mplayerhq.hu/DOCS/HTML/en/menc-feat-vcd-dvd.html
> > > It definitely is in there, but too late, in the "Putting it all
> > > Together" section. It should be mentioned early on (with a short explanation
> > > of its meaning, what it does and why one needs it for mpeg encoding).
> > >
> > > Anyone cares to change that? :)
> > 
> > I could change it, but I need to be dead sure that this option is
> > absolutely necessary. Nico, can you confirm?
> 
> I can confirm - without harddup, MEncoder uses "0 byte frames" to make a 
> fake delay, to constrain to fixed fps. 0 byte frames are legal in AVI, but 
> the are completely illegal in MPEG and will most likely even make the mpeg 
> muxer fail, as it has a framer that reads the frames given it.

I want to mention also that harddup is sometime necessary also for avi.
There are hardware players that will desync if the avi has been created without
harddup.

Giacomo

> 
> it's either harddup, or -mc 0 -noskip, or just pure luck that mencoder for 
> this specific file didn't give you any duplicate frames.
> 
> - ods15
> 
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