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Halbbilder von DV-Camcoder capturen

Half of capturing DV Camcoder



Frage von juriman:
April 2009

Hello,

It is possible of my Samsung VP-D381, the live image with 50 fields / sec via FireWire to the PC to get?
I want the data processed with Direct Show.
Until now I can only from one frame buffer (the last two frames together) raushohlen that every 40 ms is created (25 frames / sec).

In general, it is in such cameras is not possible? (apart of the prof. the progressive record)
Is there a special function in the DirectX / DirectShow?



Antwort von tommyb:

If you already use Direct Show, then the picture will be deinterlaced to just 50p (bobbing).

Try something with ffdshow tryouts. There is a deinterlace of just these 50 images from an interlaced stream is created.



Antwort von juriman:

Yes exactly. But such a deinterlacing algorithm, I'd like to write yourself.

Since I deinterlacer in any case need the half separately, it would now halt the question:
Encapsulates my computer - the fields together and sends only every 40 ms by the full FireWire, which we then manually with DirectShow must divide?

If not and I can all my 20 ms elicit a half, the next question would be:
How can I single out field with DirectX?








Antwort von MK:

"juriman" wrote:

Since I am the deinterlacer in each case the half separately needed


The fields separated deinterlaced is equal (in the case called the BOB). What do you want from various fields have deinterlace next? I do not.

And if you from the 50 fields to 25 frames without interlacing want to make ... why reinvent the wheel?



Antwort von tommyb:

"juriman" wrote:
Encapsulates my computer - the fields together and sends only every 40 ms by the full FireWire, which we then manually with DirectShow must divide?

Yes, you. The Picture what your supply is always 25i, ie 25 interlaced images.

The only way here to get what otherwise would be a record of the progressive, such as 50p. This allows devices such as the JVC GY-HD1 series ** (; 576p50) or the JVC GY-HD2 Series ** (; 576p50 and 720p50) - but this is everything "HDV" in various modified forms.

DV sees no possibility of a full half to send. Always sends DV 25i (; even supposedly progressive 25p material) and it can not resolve except by a split in DirectShow.

ffdshow is open source so you can be happy there bobbing script borrow. Or use the same ffdshow. Anders is not the point.



Antwort von juriman:

@ MK: I think you have to you again the definitions of the terms read.

@ Tommyb: Super answer. Thank you very much!
Would you have any sources that prove your statement?



Antwort von MK:

"juriman" wrote:
@ MK: I think you have to you again the definitions of the terms read.




Rather you if you are not even the difference between Fields and Frames kennst.

Parts of the frame (frame) in odd and even lines (Fields) and you have your half.

But a single field is always without interlacing.



Antwort von juriman:

@ MK: Your contribution does not really help me next. We talk probably s.einanander over.

@ All: Where is it specified what tommyb claims?
With IEC 61834 (http://tools.ietf.org/html/draft-ietf-avt-rfc3189bis-03) is unfortunately nothing more.



Antwort von tommyb:

A DV stream is purely digital, a transfer of nested streams interlaced frame manner, therefore, both fields simultaneously.

Only a stream of analog would each field in a row over - at least, a CRT TV as the show.

That was so because of the firewire cable coming out are precisely 25 interlaced frames. Nothing else. You can not force synonymous instead of the 25 720x576 pixel frames per second, 720x288 at 50 units to transfer. I do not.




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