Vertical video lines visible in FCP viewer? Normal?

[Khashyar Darvich]

Hello,

Has anyone experienced the same visible verticle lines issue on a computer monitor? Is this normal because of the interlaced nature of NTSC, and the noninterlaced nature of a computer monitor?

Thanks,

Khashyar

[Andy Mees]

[Khashyar Darvich] “Are visible vertical lines in DV video in the FCP viewer window normal?”

no, this doesn’t sound normal

[Khashyar Darvich] “I can’t see the verticle lines from the same footage in my Sony PVM-14L5 monitor that I have connected through an AJA LHe card.”

then its ok… what you are monitoring on the PVM through the AJA card is the ‘true’ image … the one on the computer display is only a ‘preview’

[Khashyar Darvich] “Are the visible vertical lines in video on the computer monitor a result of a progressive scan of the video frames as opposed to the interlaced scanning of the video?”

interlacing artefacts tend to show up more as horizontal lines, not vertical … can you post a screen shot so we could see the specific problem

[Khashyar Darvich]

Thanks for offering your feedback, Andy.

Would I need to post a link to the screenshot after posting it on my website?

Khashyar

[Andy Mees]

sure, that would give everyone a chance to look and see if its an identifiable problem

[Khashyar Darvich]

As Andy recommended, here are screen shots to the vertical lines that I am noticing:

Clip #1 (Full size)> https://www.wakan.com/images/fcp/example_1_wide.jpg

Clip #1 (Closeup)> https://www.wakan.com/images/fcp/example_1_cu.jpg

Clip #2 (Full size)> https://www.wakan.com/images/fcp/example_2_wide.jpg

Clip #2 (CU)> https://www.wakan.com/images/fcp/example_2_cu.jpg

Clip #3 (Full size)> https://www.wakan.com/images/fcp/example_3_wide.jpg

Clip #3 (CU)> https://www.wakan.com/images/fcp/example_3_cu.jpg

Thanks for any feedback,

Khashyar

[Andy Mees]

unfortunately, I think you’ll find those images are only showing typical DV chroma compression artefacts … not something you can easily avoid when working with DV! You can see too much detail on the fancy 30″ monitor of yours …

you will find a wealth of technical info on all things DV at Adam Wilt’s website:
https://www.adamwilt.com/DV.html

also highly recommended is Graeme Nattress’ Chroma Sampling article at the LAFCPUG website:
https://www.lafcpug.org/Tutorials/basic_chroma_sample.html

[Jim Martin]

all of those screen shots you posted are over 100%, and the CU’s are 400%
You can’t blow up DV without seeing compression garbage

Jim

[Khashyar Darvich]

Thank you both for your feedback. I feel better, especially since I cannot see the vertical pixel lines in the NTSC monitor.

I bought the 30″ cinema monitor a month ago, and I suppose that I was not used to the improved image from my last CRT monitor.

I have a question, though. How are films, that have been shot in DV, able to be blown up to 35mm film without showing the pixelation? I know that video-to-film houses use special software as part of the conversion process (which “softens” pixelation, I believe).

Thanks again for your thoughts and feedback.

Khashyar

[Khashyar Darvich]

I want to also mention that when I play a DVD of a documentary film in full screen view on the 30″ monitor, I don’t see any pixelation at all. Is this because the movie has a different (MPEG4) compression?

I believe that the film (“The Ballad of Bering Strait”) was also shot in DV, but it was later transferred to film for theatrical release.

Why does a DVD not show the pixelation when viewed in full screen mode on the monitor?

Khashyar

[Khashyar Darvich]

Hello,

Andy and Jim mentioned that the vertical pixelation was a normal artifact of the compressed DV format.

I wonder if you show an uncompressed BetaSP clip at the same viewer window size, if you can also see vetical pixelation? I wonder this because I was reading that while computer monitors employ square pixels, NTSC video monitors use retangular pixels. Could this cause a distorted look when looking at DV video in a computer monitor?

Khashyar