Hi Brian -
On Fri, 14 Nov 2003, Brian J. Murrell wrote:
> I just don't have the time to do that kind of system maintenance --
> keeping packages up to date, rebuilding all that.
Hmmm - once it's working it is no maintenance at all. How much
time has been invested in the approach of trying to find a pre-built
system that meets your needs?
> Yeah, I have been using libquicktime (9.2 and currently 9.2pre1) in the
> recent past but my most recent O/S upgrade and video tools rebuild saga
A couple months ago or so the libquicktime project had a brief burst
of activity (it's not a high activity project, tend to be a couple
times a year a burst of activity happens) that may have fixed your
problem.
It is a shared library so what's to rebuild as long as the API
hasn't changed? Install the new libquicktime and the existing
applications will start using it.
I installed Suse 9.0 the other day and it was little more than
an evening's work to get everything (50+ project/programs) rebuilt
and running.
> > What type of capture hardware are you using? A DV method or
> > a WinTV card, or a MJPEG card?
>
> MJPEG from a G400 Marvel.
Ah, ok. I've heard of those but have never seen one (not sure
if they're still being made - I don't think so).
> > For the most part I haven't found MPEG4 to be better at the larger
> > frame (704x480) frame sizes.
>
> Than MJPEG? I can compress 5G/hour of MJPEG down to about 800MB/h of
No, than MPEG2 - the reference was to the final encoded format since
mention was made of mencoder vs mpeg2enc.
> Right. mpeg2enc is out of the question. Far too slow on my 800MHz
> Athlon.
I've been doing some encodings on my workstation at work which since
the bean counters denied the upgrade request is a Pentium-3 800MHz .
It is a dual cpu system though so I can do some test encodings
and still use the system for other things.
Using 'mencoder' and as many of the high quality settings as I
can dig out of the documentation I get about about 4 frames/sec with
mencoder going from DV to MPEG-4. Takes about 22 hours to do a 2 pass
encoding run of a ~90 minute movie (granted that's a 672/448 size).
> > But it can read from stdin can't it? Piping into mencoder should
> > work ok.
>
> Yes, but from what? I just did an avimerge and noticed it does a whole
I was thinking of smil2yuv or ffmpeg perhaps. Ffmpeg emit
YUV4MPEG2 output, that I know and it has (I think) mjpeg support.
Perhaps using ffmpeg to do the recording might be something to
try.
> boat-load of seeking in the file after it's finished merging them.
Index creation I think. Yes, it's a side effect of the AVI format ;(
> I shoulda also mentioned in my requirements list that I have no budget
> for new hardware. If I did I would just be done with all this and buy a
> PVR-250.
Oh well -that shoots that idea down.
If one can't throw money at the problem then the only thing left
is software ;) Might be the newer version of libquicktime would
work just fine and then the problem's solved. It did appear
that nothing special needed to be done in the lavtools to take
advantage of the OpenDML capability - it might "just work". I haven't
tried it though.
Cheers,
Steven Schultz
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