Frage von Ipiranga:
I would like to view video footage of a U.S. firm to produce. This company actually uses NTSC DVCAM. Because this format is not very timely and I is synonymous not yet know whether it really synonymous with the decline works out, I want an HD format to use 25p.
My questions:
1: Can you format a HD with 25p in NTSC DVCAM format each other or any PAL or NTSC format?
2: Is this additional loss of image quality due to different fps of progressive or interlaced frames on?
3: What is the cost of a standard conversion ca?
4: How would you proceed?
Thanks for any useful AW :-)
Antwort von dietzemichi:
Standard transformations gernerell should have appropriate companies made, depending on the cost Badnlänge and / or format unterschiedlch.
Antwort von tommyb:
If it is very important material, then there should be an external company, which has something for expensive equipment.
If it is not so important, then I would proceed like this:
Option 1:
25p material "slow" at 24p (23.976) and then with the so-called 2:3 pulldown to 30p (29.976) bring.
This one has with his material exactly done what with the shooting happened in the U.S. - namely, a PAL Speedup, only vice versa (thus PAL slowdown).
If the material is a scenic film, I would prefer such an approach. Here you have only to adjust the sound - so slow down accordingly.
Option 2:
25p to 30p material (29.976) where you can bring the missing frames can be calculated.
This makes it an often encountered, but quite inferior synonymous change. The intermediate images can be either ghost images (using two images to an intermediate image together) or some of the images are displayed twice. Case 1 would be preferable, since in case 2, a bucking might emerge (for pans).
In this case you have not the sound of the speed adjust, he can stay that way.
Option 3 (now wirds complicated):
Material take 25p, 60p up to expect (with double and triple frames displayed - no visors!), Then in half to convert and save.
Is the worst method of all, but it is now for example with Anime DVDs made just of NTSC to PAL.
The quality in this case is already very poor - but only on the LCD and plasma displays. The tubes can turn it look good.
Option 4:
Same procedure as option 2, but to reach the meantime, take special pictures of Avisynth plugins on the basis of vector calculation almost correct images.
For all three options can be used Avisynth. My favorite is definitely # 1, because here the highest possible quality is - does, however, synonymous only with 25p. For interlaced remains nothing else than Method 2 (60 instead of 30).
Antwort von beiti:
25p material "slow" at 24p (23.976) and then with the so-called 2:3 pulldown to 30p (29.976) bring.
This one has with his material exactly done what with the shooting happened in the U.S. - namely, a PAL Speedup, only vice versa (thus PAL slowdown). I do not know what medium you want to deliver the material. If you which to view a DVD to send it, I would only slow down to 23.97 fps and directly burn it to DVD, the DVD standard is familiar with a full-screen mode. The vast majority of movie DVDs are mastered at 23.97 p, because in conjunction with Progressive players and flat screen / projectors gives better picture quality than standard NTSC, which will pull back only to be undone.
However, I would clarify in advance whether any progressive material is desired, because it's not for any purpose so great (keyword motion resolution). If the company prefers interlaced material, I would have a conventional standard conversion in as good quality can make, then at the normal NTSC with rauskommt fields.
And if the material is solely for the U.S. market, saving you all the standard change-Mist and rotating the same in a 60-Hz format.
Antwort von Ipiranga:
Thank you for your detailed answers. I will in any case of a company and leave time to ask which format is used as source material would probably s.vernünftigsten. It is important of course, that the quality loss is not too great.
Perhaps it would be better if you interlaced and 30 fps at 1920x1080 revolves. That would be a Downconvertieren likely to NTSC s.besten. I would absolutely shoot Full HD, perhaps because the Blue Ray someday achieve critical mass and then perhaps standard.
Antwort von MK:
Perhaps it would be better if you interlaced and 30 fps at 1920x1080 revolves. 30fps is almost (TV) NTSC ... the minimum speed adjustment and the downscaling of anamorphic 16:9 can be regarded as 100% lossless consider.
25p after 23.97fps including downscaling is also lossless, the duration is about 4% and the soundtrack has to be adapted (time time) as the voice / music by the length change anything deeper sounds.
Interlaced or Progressive depends solely from the planned use from (a high temporal and high spatial Resolutionbenötigt).
We convert to the type material nearly 250 hours a year. You should only make sure that your service provider, the frame rate by a modified adjust playback speed and not have a standard transducer is used to calculate Zwíschenbilder, which is unnecessary in the case and gives a poorer quality than necessary.
