On Wednesday, November 19, 2003, at 02:19 PM, Florian Reiger wrote:
hi roger,
thanks for your explanations. sorry that i didn't include my encoding
options. that sample i provided was encoded with following options:
basic:
dual-pass
dual pass goal: best quality
advanced:
half pixel motion: checked
four vector motion: checked
mpeg quantizer (asp): not checked
adaptive quantization: not checked
pure mp4 video: not checked
vopn coding: not checked
so you're right and that sample was no advanced simple profile content.
Right... had you checked those options you'd have gotten even better
efficient (quality vs bitrate), but would lose QT MPEG-4 compatibility.
Using these settings (though I'd usually constrain my encoding by
bitrate, not quality) you can definitely produce much better streams
than Quicktime's MPEG-4 encoder. Adding ASP features will only make it
better yet.
in any case the simple profile content that is created by 3ivx
delivers probably the best quality for the quicktime player without
any additional codecs installed.
Indeed, it looks like it, though I'm withholding judgement until I'm
done testing...
can't wait for your results of the comparison with the squeeze encoder.
do you think that diva delivers better quality than quicktime pro or
is it just easier?
I don't see DiVA and Quicktime Player as solving the same problems.
DiVA is an offline MPEG2 decoder and deinterlacer; DiVA does not do
MPEG-2 playback, or even audio decoding. DiVA is for MPEG-2 to
Quicktime conversion, using any codec you'd like (with special support
for 3ivx).
Quicktime Player is a media player, with some basic encoding support -
really, it's just exposing the basic encoding support Quicktime itself
offers, it has no specific additional encoder features. Quicktime
Player doesn't ship standard with any MPEG-2 support, though there is a
commercial component from Apple, but that is quite different from DiVA
- it's playback oriented, and does support audio (though doesn't demux
it, so it's also useless for decoding audio from MPEG-2, like DiVA).
For going from MPEG-2 to Quicktime, DiVA will always have a clear
edge... it's faster, has better quality decoding and deinterlacing, and
maintains an all-YUV pipeline if you care. But that's ALL DiVA does...
Cheers,
Roger
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