Viewing transcoded interlaced video without "lines"

[gino25]

Hello,

I've a question (sorry for my poor english).

I've a video interlaced. I must transcode it. I read that i must deinterlace it, and encode it a progressive.

I tried to encode it as interlaced but i see a lot of "lines" in images.

So my question is... Why must i transform that video in progressive. Why i see "lines" if i trnscode it, but if i see original video i don't see those "lines"? Thank you very much

[Redsandro]

If I had a cent.. here is a pretty good explanation, I hope it helps. :)

http://www.100fps.com/

[gino25]

If I had a cent.. here is a pretty good explanation, I hope it helps. :)

http://www.100fps.com/

thank you for that link. But that link explain how to deinterlace.

I want to keep my video interlaced.... And when i play it i want to view it correctly... Now if i encode that video interlaced, i see "Lines". Maybe there is a flag in mkv or avi header to set, so decoder "know" that video is interlaced, and deinterlace it properly.
I want encode interlaced as... interlaced :-)
Sorry again for my bad english

[CWR03]

Install ffdshow and enable deinterlace.

When you re-encode and keep interlaced, you require much more bitrate for the same quality output (At least with MPEG-4).

[Redsandro]

If you play it back on a computer or beamer or direct lcdtv connection, you see lines because that equipment cannot play interlaced material back. If you do play it back on equipment that supports interlaced material, I don´t know why you would see the lines. Even if the fields are in the wrong order you shouldn´t see lines, just a jumpy picture.

So I can´t help you there. I just think your playback device does not support interlace (computer?) and you need to deïnterlace. There is no alternative.

Sorry if I misunderstand. Good luck.

[Guest]

You could see the lines if you have naively resized the interlaced material.

[gino25]

ok boys, thank you... Now i understand..... :thanks:

[Jay Bee]

Still the same old myths, computers can't play interlaced, interlaced will use more bandwidth etc...

In fact modern GPUs are very good at deinterlacing, you just need to set the flag during encoding and use a decoder that respects the flag.

But usually the discussion ends quickly as it either turns out that the poster's content isn't really interlaced or because someone claims that the difference between 50 Hz and 25 Hz is barely noticeable...