Deinterlace VOB/DVD, which tools, requires re-encoding?

[veroslav]

Hi,
I have a few dvds on my hard drive (VIDEO_TS folder structure) that I need to edit (cut out the commercials) and then author the result as a new dvd.

The problem I am facing is that the ripped dvds are interlaced and it is very annoying when watching them on tv during the fast-paced scenes, when the interlace effect is as most obvious.

Are there any tools (Windows or Linux) that would allow me to deinterlace the ripped dvds before/after I am done editing out the commercials, so that the result is not interlaced? I am trying to avoid re-encoding the result, as I would like to keep the same high quality as the original dvds. What can you suggest me? What is the recommended approach?

Thank you in advance.

Kind Regards,
Veroslav

[Baldrick]

How are you ripping and converting? You should keep it interlaced all the way.

You can for example cut out commercial with videoredo and make a new dvd. It shouldn't reconvert anything.

[veroslav]

Thank you for your reply, Baldrick.

Unfortunately I don't have access to the original dvd source so I can't influence the ripping and converting anymore.

I will check out videoredo (currently using Womble MPEG Video Wizard and AviDemux, been having some issues with AviDemux lately, usually it is my preferred application for video editing).

Could you please elaborate a bit more on why I shouldn't bother with deinterlacing?

Thanks again!

Kind Regards,
Veroslav

[Baldrick]

Mpeg video wizard should also work fine.

Your tv/player should handle the interlacing. BUT if you have already converted and maybe it has caused some interlace issues you might have to do something. But then we need an example video.

[veroslav]

I will have a look at my tv/player settings first. I think that the tv has some settings for this, that I MIGHT have modified before and perhaps that is what is causing the videos I watch to be displayed interlaced.

If the above doesn't fix it, then I will play around with deinterlacing a bit more.

Just to confirm, if I was to apply the deinterlacing in any of the video editing tools that support it, would that mean that the video would have to be re-encoded (which I suspect would be the case) and thus the video quality would drop? Just need to confirm this before I start experimenting.

Thanks for the help so far, I've learned something!

Kind Regards,
Veroslav

[manono]

Just to confirm, if I was to apply the deinterlacing in any of the video editing tools that support it, would that mean that the video would have to be re-encoded (which I suspect would be the case) and thus the video quality would drop?

If you can see interlacing when watching the DVD on your television set, then something's very wrong with your DVD. I take it you didn't create the DVD yourself? DVD players and TVs are supposed to deinterlace automatically. I can think of one instance where it might not occur - an interlaced source encoded as progressive. Also it may have been resized improperly and if true, it can no longer be deinterlaced. You might upload a small 10 second piece of a VOB for us to have a look, a piece showing steady movement.

To answer the question, though, if you deinterlace, it requires reencoding the whole thing. Will the quality drop? Well, if it gets rid of the interlacing it might even be an improvement. But a reencode shouldn't damage the quality too much if done properly.

[veroslav]

Hi manono,

thank you for the reply. It is true that I didn't create the DVD. I think that you are probably right when you say that the creation of the DVDs wasn't done properly and that is why I am seeing the interlacing on the tv as well. This is true for only some of the DVDs I have, the other don't display this behaviour.

Also, I noticed that the better the quality of the footage, the more visible the interlacing effect is.

I will try to upload a few secs of the video tonight when I am at home, in which the interlacing can be seen.

It is not THAT big issue really, I mean, I can accept it, I just wanted to know if it could be fixed without loosing too much in video quality (preferrably not at all).

Thank you, appreciate the help.