On Sun, 17 Aug 2003, Bernhard Praschinger wrote:
> Hallo
>
> > Way to go! That's it.
> > It looks far better than with yuvdenoise, almost identical with the
> > original DV file. No more blockiness. Some very difficult scenes are
> > slightly smeared (flat distant slow-flowing river surface rippling in
If the CVS version of mpeg2enc was being used the -N value could
be selected to be less aggressive and perhaps more of the detail
would be retained.
It looks like the original material is extremely rich in
high frequency content and increasing the quanitization of the
HF reduced the bitrate required.
> > I find it surprising i'm having so many difficulties and yet results are
> > only moderately good (not perfect) while commercial DVDs, at the same
> > resolution (720x480), using smaller bitrate, offer a much better image
> > quality.
Well, the latest version of mpeg2enc could be tried - there have
been quality improvements made over the past year. Also the
ffmpeg DV decoder will gain some quality as compared to libdv.
Lots of things to try ;) So far I've been very happy with the
quality from mpeg2enc (it's as good, I think, as the mpeg2
encoder Apple uses for their DVD products).
> > Is it due to the codecs they use?
> Which codec ? They can only use MPEG2. It is very likely that they have
I was going to say the same thing :)
> a better mpeg2encoder. You usually wont/cant efford. After all the
> equipemnt they use for creating DVDs is far more expensive that what you
The professionals, in addition to having _extremely_ expensive
encoders also have very sophisticated (and you guessed it - very
expensive) filtering capabilities.
And then too the commercial DVDs are created from either film
or from very expensive cameras (and probably using equipment to
make sure the camera is held steady even if the operator is
moving). In the pro world cameras for casual use start around
$15K and go up very quickly from there.
Was a tripod being used? Camera shake ruins MPEG-2
compression - I could see the difference in the footage I shot
while on vacation. The bitrate for those sections I hand-held
the camera was close to twice the bitrate for the portions I
used a tripod.
> For my experience the comercial DVD's usually have a very high Bitrate.
> At least the PAL DVD does have a bitrate always near the 9MBit. I have
That is my experience as well. The real good looking DVDs
are rarely below 6 to 7MBit. Also - consider too that the
commercial DVD producers have at least twice the space available
to use. They can use dual layers or even double sided dual
layer discs - bitrate is not a concern for most commercial
DVDs.
Cheers,
Steven Schultz
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