[MEncoder-users] Vbitrate not honored?

[Tsz Ming WONG]

On 8/25/06, Stefan Neufeind <mencoder at stefan-neufeind.de> wrote:
>
> RC wrote:
> > On Fri, 25 Aug 2006 01:19:12 +0200
> > Stefan Neufeind <mencoder at stefan-neufeind.de> wrote:
> >
> >> Framerates seems to be fine on the resulting video - even without
> >> giving an explicit fps. But the file is *much* smaller now.
> >
> > You ALWAYS need to set an -ofps value with WMV files.  They are variable
> > FPS, so mencoder will use 1000FPS if it's not set.  It's likely that's
> > the reason for your bitrate problem.
>
> Hi,
>
> oh yes - that works. Excellent! It's only needed for WMV, or for other
> codecs as well? Using ofps was a general rule for automatically
> converting might not be a good idea - I guess - becuase that might leasd
> to framerate-changes (and copying/dropping frames). Is that right?


yes, for most files, `ofps` is not needed, you need to provide the correct
`ofps`

Is there a way to determine the optimal fps to use? With a 4-minute WMV
> I was experiencing some A/V sync issues (only fractions of a second
> max). If I see it right changing ofps (25 -> 30 -> 15 -> ...) helps a
> little. Either I might be wrong :-) or it might be true - not sure.
> Windows Media Player reports the file as having 15 fps. Others have
> reported on the mailinglist that using 30 worked fine for them. That
> depends on the input-material right? Are there currently some tricks to
> minimize A/V sync sideeffects?


try mplayer identify command

sn
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-- 
Best Regards,
Ming