do i really need to deinterlac?

[tinkyawoo]

Hi,
I know that deinterlacing will make movie looks good on LCD display..
but , what i am thinking about right now is a little silly.

do i really need to deinterlac the interlaced home video for editing, adding some transaction and some funny special effects???

what If i just do all the work on interlace video ? is it good practice or bad?
it seems that after deinterlaced, the images are a bit flattened.

[whatsmyname]

Depends on how your player and TV handles interlaced videos. My CRT don't handle interlaced video very well as it shows horizontal lines so I have to deinterlace my videos.

My other plasma handles interlaced fine so I don't bother with it. Deinterlacing will cause the picture quality to go off, be sure to add a sharpening filter to counter the quality loss abit.

Cheers,

[tinkyawoo]

thanks whatsmyname..
actually. the output display is not my concern.
my concern here is about editing..
will deinterlacing make my video quality lower or. without deinterlacing make my editing something that i dont know???

[guns1inger]

Software interlacing will generally reduce the quality of your video. Most editors are designed to work happily with interlaced material, and will easily do your transitions and effects. You TV will do a much better job deinterlacing on-the-fly than you will in software.

[jagabo]

Depends on how your player and TV handles interlaced videos. My CRT don't handle interlaced video very well as it shows horizontal lines so I have to deinterlace my videos.

If you're talking about a standard definition CRT TV you are doing something wrong in your processing/conversion. SD CRTs are natively interlaced and should show an interlaced source perfectly.

will deinterlacing make my video quality lower

Yes. Each frame of interlaced video contains two half pictures (called fields). Each field is taken from a different point in time and is intended to be viewed alone and sequentially. You're interlaced PAL video contains 50 half pictures per second and is intended to be viewed that way.

When you deinterlace you are essentially throwing away one of the half pictures. You are cutting the temporal resolution in half. And the spacial resolution is being reduced by up to half, depending on the algorithms used and the particular video.

[whatsmyname]

Depends on how your player and TV handles interlaced videos. My CRT don't handle interlaced video very well as it shows horizontal lines so I have to deinterlace my videos.

If you're talking about a standard definition CRT TV you are doing something wrong in your processing/conversion. SD CRTs are natively interlaced and should show an interlaced source perfectly.

Hi,

You are right, as I found out recently when my wedding video turned out like crap . The guy who filmed and produced my video was a backyard operator who pretended to be "pro"

I don't know what he did or how me processed it from camera to DVD, but the DVD had interlaced-lines all over the place. My wedding video was badly interlaced, it looked like garbage on my CRT TV and half-garbage on my plasma. I had to deinterlace to make it watchable, however I lost picture quality.

Anyway, back to the topic. I don't think Interlaced or de-interlaced content makes that much of a difference to the edit-ability of the video, only to the TV and your eyes.

Cheers,

[tinkyawoo]

If your wedding video is interlaced you chould read the following post for deinterlacing.
I have tested few deinterlacing and provided the results that i achieved..
https://forum.videohelp.com/topic354397.html

[jagabo]

I don't think Interlaced or de-interlaced content makes that much of a difference to the edit-ability of the video...

Yes, as long as your editor knows how to handle interlaced video.

[jagabo]

If your wedding video is interlaced you chould read the following post for deinterlacing.
I have tested few deinterlacing and provided the results that i achieved..
https://forum.videohelp.com/topic354397.html

Given that Whatsmyname was able to clean up his video by deinterlacing, I suspect it was fixable without deinterlacing. It was probably something simple like the wrong field order flag in the MPEG2 files. Or progressive MPEG2 encoding of the interlaced frames.

I would reserve deinterlacing as a last resort. Or for internet distribution (Divx AVI, WMV, etc.) where you can't be sure the downloaders player will do anything sensible with interlaced video.

[whatsmyname]

If your wedding video is interlaced you chould read the following post for deinterlacing.
I have tested few deinterlacing and provided the results that i achieved..
https://forum.videohelp.com/topic354397.html

Hi Mate,

Thank you for that link. You achieved some impressive results. I edit the videos in Adobe Premier Pro and de-interlaced the video from there. To be honest, I don't think the encoder (and de-interlace engine) in Premier is all that flashy, the loss in picture quality was very noticeable. I am actually still working on that video because I haven't found a satisfactory result to the interlaced problem yet. I will have a look into your method.

Cheers,

[quote="jagabo"]

Given that Whatsmyname was able to clean up his video by deinterlacing, I suspect it was fixable without deinterlacing. It was probably something simple like the wrong field order flag in the MPEG2 files. Or progressive MPEG2 encoding of the interlaced frames.

I would reserve deinterlacing as a last resort. Or for internet distribution (Divx AVI, WMV, etc.) where you can't be sure the downloaders player will do anything sensible with interlaced video.

Hi Mate,

What are some of the steps you suggest I do as an alternative to de-interlacing? I think the video was encoded with the wrong field order. I believe the original encoder used on my video was Procoder because I saw he worked on my video in Edius.

Cheers,

[jagabo]

Restream can be used to reverse the field order flags in an MPG file. I don't know if it works on VOB files so you may have to convert to MPG (lossless) with VOB2MPG. You'll have to re-author the DVD when done.

It's also possible the VOB file has the right field order but the IFO file has it flagged incorrectly. That can be fixed too -- but I don't know what programs do it. Maybe IfoEdit?

If you want to me to take a look at the MPG data you can create a small extract with DgIndex. Open a VOB file, use the mark-in and mark-out tools to mark a short section (a few seconds is enough) with a moderate amount of motion, then File -> Save Project And Demux Video. That will create an M2V elementary stream that you can upload. DgIndex will also tell you if the video is encoded progressive or interlaced. And if interlaced, if the order is top field first, or bottom field first.

[edDV]

thanks whatsmyname..
actually. the output display is not my concern.
my concern here is about editing..
will deinterlacing make my video quality lower or. without deinterlacing make my editing something that i dont know???

Were all your questions setted? You should not be deinterlacing home video. There are many reasons.

What editing program are you using?

[whatsmyname]

Hi Mate,

Thanx for your suggestions and offer to help. I'll try you suggestions first and if I still run into problem, I'll take you up on the offer


Cheers,

Restream can be used to reverse the field order flags in an MPG file. I don't know if it works on VOB files so you may have to convert to MPG (lossless) with VOB2MPG. You'll have to re-author the DVD when done.

It's also possible the VOB file has the right field order but the IFO file has it flagged incorrectly. That can be fixed too -- but I don't know what programs do it. Maybe IfoEdit?

If you want to me to take a look at the MPG data you can create a small extract with DgIndex. Open a VOB file, use the mark-in and mark-out tools to mark a short section (a few seconds is enough) with a moderate amount of motion, then File -> Save Project And Demux Video. That will create an M2V elementary stream that you can upload. DgIndex will also tell you if the video is encoded progressive or interlaced. And if interlaced, if the order is top field first, or bottom field first.