Frage von Wedding_HDV:
Hello,
I film in HDV mode principle. Often I need but a simple DVD. But do I export the cut material as MPEG-2 DVD. So far so good - works synonymous. However, I have noticed that the quality of these DVD's is far lower than its the beginning of I s.with DV Resolution720 x 576 movies and edit. If the problem is that the two systems have different Halbbilderreihenfolge?
There are customers who both BlueRay DVD synonymous as wish to have. Is there no way both in full quality to deliver?
Antwort von B.DeKid:
Are you only a downscaling or directly to MPEG output?
What Softwear you use?
MfG
B. DeKid
Antwort von Wedding_HDV:
I use Premiere CS4
import HDV sequence into a 1440 x 1080 then the same section. only for export for a DVD, I say the media encoder that I have an MPEG 2 DVD with good quality in the Pal Aufösung wants. Exports of me and with the whole time I then Encore DVD
The term downscaling, I can now not much use to us
Antwort von tommyb:
Downscaling Runterskalieren = = = Resolutionanpassen resolution "small" do
The DVD is in PAL version 720x576 pixels and your HDV will be in the export runterskaliert.
What manifests itself as the "bad" quality? The Picture is blurred? Or will it be artefact formation due to high compression, or just inefficient?
Generally one has to 8000kbit / s the tip of the flagpole achieved when it comes to self-burned DVD's. 6000kbit / s ranges from still synonymous if the 2pass procedure. All of which is always entirely on the picture content - two passes, however, is always mandatory.
The fields have, however, no blame, because that is when you export accordingly.
Antwort von Wedding_HDV:
There are no artifacts, the picture is just blurred. But in my opinion this is extremely blurred blur.
My export settings:
PAL
Lower field first
2 Pass Variable Bitrate
Bittrate min 1.5 Objective 4 Max 7MB / s
M-frame 3
N-Frames 12
Should I perhaps the minimum target bit rate and at 3 and 6 increase?
Antwort von Wedding_HDV:
To my customers the difference between HDV and DV to be able to show I have done.
An HDV sequence created and 5 min film. This movie with the above settings as a normal PAL 720 x 576 and exported in a further track laid.
Now I have two tracks in my DV and HDV sequence with the same content. Then I have the DV track pulled apart so that they are fully covered window HDV. (If I understand everything correctly - exactly happens when I make a normal DVD on a 42 "Full HD Television on the entire screen would like to view. Thus, the picture will be pulled apart)
That is what I have with my DV material made. The last thing I have the Pal - track by 50% of left to right pruned.
Now I have a picture to the 50% HDV and DV is 50%.
Then I have the whole on a BlueRay gebrant. The difference is huge! The IR picture is too blurred. Or are my eyes too spoiled?
Have I done something wrong?
Antwort von tommyb:
But in my opinion this is extremely blurred blur. Always comes to the Skalieralgorithmus to. No idea what CS4 uses and whether the set is - in general should be classified as one of "bilinear" because the fingers can be too soft. Lanczos or bicubic is preferable.
The direct comparison between HD and SD is obviously enormous. Would you rather compare 720p to 1080p so you would not find big difference - if the seat pitch is correct.
4MBit can also very well be a problem. Some encoders are capable of the Picture to "defuse". They make it with intention a little softer so that it can be compressed more efficiently. This in turn can be prevented by times with CBR 8000 kbit / s exported. Is this picture ok then, it was out. If not, it is perhaps s.Skalieralgorithmus.
I use to runterskalieren Avisynth. This means that the whole must first be exported in native resolution, possible loss (eg with the codec in an AVI Lagarith) and then be in Avisynth runterskaliert. Before I turn the whole material in progressive (50p) by using a deinterlacer, scale it down and re-interlace it again. The finished AVS file you can then, eg in the Cinema Craft Encoder and then throw his MPEG2 file received. The quality is decent for an HD-Scale Down.
If you Avisynth tempted here my script (Untested):
[code: 1:52 c17fcb2f] avisource ( "quelle.avi"). converttoyv12 (). assumetff ()
# If it is jerky, try assumebff
# Deinterlace to 50p
tdeint (1)
# runterskalieren to PAL
spline36resize (720.576)
# from the progressive to interlaced picture again
separatefields ()
select every (4,0,3)
weave () [/ code: 1:52 c17fcb2f]
Requires addition Avisynth synonymous nor tdeint filter.
Antwort von Wedding_HDV:
Thank you for your answers.
I'm trying to increase the bit rate and with the Skalieralgorithmus to experementieren. The use of other programs but I would like to avoid as far as it goes.
Good night!
Antwort von Bruno Peter:
With the free MPEGStreamclip you can with very good results downscaling HDV.
Antwort von Lutz Dieckmann:
Hi,
So I leave with a Liquid 7.2 Full Elementarystream one out format with VBR 6MBit to peak 8MBit. Quality is top. With 1.5 Mbps surprise me not to blur.
Many greetings
Lutz Dieckmann
