image capture from video mpg file

jurek · Post by **jurek** » Wed Mar 21, 2007 12:01 pm

I would like to capture a image from a video file. I follow the instructions from manual (drag jog slider to required position then switch to a image folder then select CLIP save as a still image) but so far my images aren't the same aspect ratio as seen on video. By the way I can only save the image if I click on the Timeline were the video is inserted. Any help will be appreciated.

Jurek

roy wood · Post by **roy wood** » Wed Mar 21, 2007 12:34 pm

Which version of VS do you have.

jurek · Post by **jurek** » Wed Mar 21, 2007 12:51 pm

Black Lab · Post by **Black Lab** » Wed Mar 21, 2007 1:01 pm

Put your image on an overlay track. Now right click on it on the Preview Screen. There you can choose Keep Aspect Ratio, Default Size, Original Size, Fit To Screen, or you can use the yellow trim handles to size it any way you want.

jurek · Post by **jurek** » Wed Mar 21, 2007 1:12 pm

Thanks Jeff,

I've done what you suggested but it didn¡¦t change the image to reflect its original size.
I sort of nearly sort it out by going to irfanview and resized picture by making it longer by the factor of 1.777 (16:9).
But it would be a lot easier if I can appropriate size picture using VS (10 with service pack 1) I tried to change preferences but to no avail.
I¡¦m probably missing something very simple but WHAT IT IS?

daniel · Post by **daniel** » Wed Mar 21, 2007 1:22 pm

Am I exposing my ignorance, or is that related to the fact that the video pixels, be it 4:3 or 16:3 are not square?

My saved images are the right size (720x576 here). However when seen on an image editor on a PC screen they of course look compressed.

If I select keep aspect ratio (default) perfectly match the surrounding video...

jurek · Post by **jurek** » Wed Mar 21, 2007 1:36 pm

Hi Daniel,

I don't know the answer but whatever I try the captured image (set to original size) look like objects are much, much taller than on the original video file.
I even unloaded my purchased version of VS 10 and loaded trial version from the UVS site but it didn't help.

I'm loosing hope

[/quote]

daniel · Post by **daniel** » Wed Mar 21, 2007 1:47 pm

If you are handling SDTV video, the picture is 720*576 or 720*480 (PAL/NTSC). That's how it is, and that's a 5:4 ratio.

When displayed on a TV or a computer 'DVD player' the pixels are elongated so that the ratio is 4:3 or 16:9, but that's artificial and only the way it displays.

If you use the image in a VS project everything is nice.

If you want to use it for any computer application (printing a cover for instance) it will have a 5:4 ratio, and you need to stretch it with a picture editing program (with the associated distortion) to the 4:3 or 16:9 ratio.

Sorry if I mistake what you're trying to do.

jurek · Post by **jurek** » Wed Mar 21, 2007 1:54 pm

Daniel,

I would like to capture those images and insert them into a document. I've never used those images in VS project and I don't know if they display correctly after the dvd is run. If I have to stretch those images that's fine but I expected to have them nicely prepared by VS - the program which edits video and should give me a correct sized image of that video.

ok, next time I'll have to look for a better software
Thanks
Jurek

daniel · Post by **daniel** » Wed Mar 21, 2007 2:19 pm

No video editor will give anything other than a 720*576 or 480 image from a SD video.

That's it's original size, it's a standard, and there's nothing nobody can do about it , except distort it via any image editing program you wish.

jurek · Post by **jurek** » Wed Mar 21, 2007 11:44 pm

ok. I inserted into a timeline couple of images previously captured from a video. When I played the project I've noticed theimages are still very squashed and become normal when i changed resampling option to : "fit to project size". I think it is completely illogical. I should have correct size images in first place (doesn't matter how but VS should look after that) and then within a project I should be able to do anything with those images i want.
Looks to me the logics in VS is up side down...or maybe I'm too demanding. It is probably still good value for money.

Jurek

daniel · Post by **daniel** » Thu Mar 22, 2007 12:40 pm

I just tried it and the pictures are exactly the same displayed size as the video they came from. With the default keep object ratio.

Are you positive your project properties show Perform Non-square pixel rendering?

Post by **Ron P.** » Fri Mar 23, 2007 12:02 am

jurek wrote:ok. I inserted into a timeline couple of images previously captured from a video. When I played the project I've noticed theimages are still very squashed and become normal when i changed resampling option to : "fit to project size". I think it is completely illogical. I should have correct size images in first place (doesn't matter how but VS should look after that) and then within a project I should be able to do anything with those images i want.
Looks to me the logics in VS is up side down...or maybe I'm too demanding. It is probably still good value for money.

Jurek

Sorry Jurek, I strongly disagree with you. You are using a Video Editing program. The video and images must conform to what is set by the industry as standard aspect ratios for given areas. The SD standard resolution for video to be viewed on TV is 4:3, and widescreen is 16:9.

I don't know of any consumer level video editing applications that are capable of what you want. As Daniel stated use an image editing application which is suited for that purpose. I don't suppose you would expect PI, PS, PSP, or Irfanview to handle your video?

mahutchinson · Post by **mahutchinson** » Fri Mar 23, 2007 12:42 am

I agree entirely with Jurek. Having just started using the software I find it completely bizarre that captures display at a different format than the video they are sourced from. It can surely not be that difficult to program a correction.

daniel · Post by **daniel** » Fri Mar 23, 2007 11:53 am

Captures ARE displayed and saved at the format of the video they are sourced from.

It's TVs and video player programs that DISTORT the presentation of the images because historically the industry when color TV started was unable to produce screens with square pixels using three different color dots.

It is made worse with 16:9 where the pictures are wider, using the exact same number of horizontal points. Live with it because you can't move the mountain. Wait for true HDTV.

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