Why do I get de -interlace combing when watching DV AVI files

[chuckvb]

I want to transfer my DV file to my hard disk in native format and can but if I play the file I get combing on moving objects. It seems that the deinterlacing for playbackof the native avi file is not done correctly . If I convert the file to NTSC and save itI have no problems but I want the best quality storage for the orginal file.

[neuron2]

if I play the file I get combing on moving objects. It seems that the deinterlacing for playback of the native avi file is not done correctly What are you playing it with and have you enabled deinterlacing?

[LocalH]

If I convert the file to NTSC and save itI have no problems but I want the best quality storage for the orginal file.
You currently already have that, as DV stores each pair of fields in a full frame (same as most, if not all, modern video codecs). If you do any processing to the file to deinterlace it, you're going to either make a 60p file that merely wastes space for no useful gain, or you're going to make a 30p file that has half the resolution of the original. Neither option is as useful as merely retaining the file you already have, which does contain all the resolution as it was captured and needs no further processing.

[Ghitulescu]

If I convert the file to NTSC and

What's this? :confused:

---------

The best way of archiving DV tapes is on a DVDR. One tape per DVDR. You get thus the maximum bitrate that's allowed for DVD and the quality loss is undiscernable, at least with amateur tapes shot with amateur cameras (you have much less resolution due to imperfect optics that you may think, of course you'll have all the pixels but the resolution is not there).

However, now, you can store the AVIs onto BDR as data (I think it would fit 2 hours DV per BDR). But you cannot play it directly.
-----

What I do is extremly simple, but you need a special hardware: I edit my DV on PC then stream the edited footage not to camcorder but directly to a DVD-recorder (I know, there are very few that accepts input from PC, because they are masters on the bus). You can send it back to camcorder or DV-deck, then feed it again from deck to DVD-recorder. Why? because a DVD-recorder (or yourself) don't get confused about interlacing issues, dynamic ranges or other things.

My Pioneer is far better in real time than CCE in 2 or 3 passes. And it's done in real-time, while CCE needs on my 2.5GHz about 4x more time. 3 hours less and better quality.

[Ghitulescu]

neuron2 is right when he asked you how you play the DV files. Because the PC display is always progressive while DV is always interlaced. So a deinterlacing process is inherent to any play in computer. If you can influence it (parametrize it) is a different story ....

[bb]

neuron2 is right when he asked you how you play the DV files. Because the PC display is always progressive while DV is always interlaced. So a deinterlacing process is inherent to any play in computer. If you can influence it (parametrize it) is a different story ....
DV is not always interlaced. There's progressive DV as well.

bb

[JohnnyMalaria]

If you use Windows Media Player to play your DV files then it will deinterlace during playback (as long as you haven't changed the DV decoder used from the MS one) and it will display the video with the correct aspect ratio (i.e., it won't stretch or squeeze the video).

[Ghitulescu]

DV is not always interlaced. There's progressive DV as well.

bb

You, as a normal customer, don't have access to real progressive DV, which is reserved for professionals (only DVCPro I think). The consumer camcorders that claim that they are progressive actually deinterlace themselves the interlaced signal.

[2Bdecided]

The DVX100B is hardly a consumer camcorder, but it's real 25p, and I don't think it's DVCPro - just standard DV.

There are several Canon HDV camcorders that do real 25p HDV and can downconvert in real time to real 25p DV.

In any case, even those camcorders which claim 25p but don't grab a full resolution image, still produce progressive DV. It might not be the sharpest image vertically, but there's no interlacing in sight!

Cheers,
David.

[bb]

My Canon MV3 MC PAL is a progressive scan miniDV camcorder. It records 4:3 or 16:9 anamorphic, progressive or interlaced standard DV (no HDV, no DVC). I must admit that there aren't many progressive scan consumer camcorders, but they exist.

bb

[smok3]

yep DVX is DV, progressive, the never prosumer hdv camcorders are usually progressive as well for dv format.

[Ghitulescu]

Yep, more and more features jump from pro to consumer:
a few years ago was a dream to have zebra or at least manual audio level.

[LocalH]

DV is not always interlaced. There's progressive DV as well.

bb
DV is technically progressive in terms of how the pictures are stored - but then again, most modern (and widely used) codecs are this way (I'm pretty sure MPEG-2 and MPEG-4 all store interlaced frames as frames with a bit set denoting interlace, rather than each field being stored as a separate picture).

[2Bdecided]

These codecs can be frame or field based, but frame based doesn't "equal" progressive.

Even in frame mode (by far the most common way of coding interlaced material), various aspects of the coding can be switched to parameters that are optimised for interlaced content (e.g. chroma sampling, motion compensation, quantisation etc etc etc). The difference isn't just one bit that means "interlaced".

Cheers,
David.

[Ghitulescu]

Your question seems to have been overlooked in this technical discussion:

It doesn't matter how your PC displays/plays the AVIs, important is that they are 1:1 identical to the source (if firewired). So store them as they come from the firewire and that's it (end of story). A new chapter may however begin when you want to transcode them to other formats (DVD, MKV, MPEG2, h.264 etc.). For this however :search: or have a look in this subforum.