jerky rendering

[Katachi]

Hey,

"jerky" is a quite general description. I don´t really see what you mean by jerky. Could you elaborate by showing the rendering (or at least a comparable render)?

[shamhead]

Whats the framerate? Is it progressive 25fps or something similar? If so it could be playing fine its just that you notice the framerate more often in horizontal movement. If this is the case I think you'd have to use quite a lot of motion blur or else work with interlaced renders instead.

[Per-Anders]

Are you sure your computer can play this back correctly at full res? Also check that your project has the correct frame rates and is interpreting the footage at the correct framerate? Try rendering the sequence as a smaller quicktime or something to check that the motion really is smooth from Cinema. Don't forget that without motion blur something like 25fps can become noticeably "strobey".

[slouchcorp]

if you renderd at 25fps, make sure AE is reading it at that and not 30 wich is its defult till you change it


Mike

[imashination]

I bet my right bollock that you're taking a 25fps clip in and working/exporting it as 30fps. Or vica versa

[Zmurowski]

I also bet imashination's right bollock that that's the case. And his left bollock that you might actuall have problems with playing the movie at full res. :)

[Mike Abbott]

I bet my right bollock...

Let's just hope you're right ... :)

Mike A.

[adamdaly]

i think i'm owed one right bollock.....

to me it looks like it needed motion blur so i've set a render with motion blur to see if that helps. in the tests that i did with motin blur it looked a little better, but was still 'stroby.'

if it still looks crap i'll look into the interlacing thing see if that helps.

thanks

adam

[imashination]

Can you show us?

Or a wireframe render, or a render where the main item has been replaced with a cube.

"Its jerky" could mean so many things, but well be able to tell you in an instant what it is if we can see the problem.

[sismik]

Interlacing will only help if you play it on braodcast television and not on computer screen

You can render at double frame rate (50fps) and then interpret it as regular (25fps) in AFX. Sure help to smooth things up.

And by the way...I dont bet any bollock :-)

Good Luck

Martin

[Simon Wicker]

you have to remember that anything can strobe - film shot at 24 fps at 1/48th of a second will strobe when you pan the camera. it is just the nature of the beast.

to minimize strobing you can render with motion blur (smb set to about 75%) but you will not be able to eliminate strobing completely.

to remove strobing you would have to have the shutter held open 100% of the time (which is impossible in the real world).

cheers, simon w.

[adamdaly]

hi again, i finally had time to render out a small video of the problem. have a look and tell me what you think of the problem.

http://www.manleys.co.uk/flythrough_small.mov (https://62.231.37.11/exchweb/bin/redir.asp?URL=http://www.manleys.co.uk/flythrough_small.mov)

thanks
adam

[imashination]

Ok, I think I know whats going on here. You're working on an LCD screen, or playing it back on a projector arent you? Watch your video in QT, then watch it again in the webbrowser link you posted, do you notice any difference?

Your LCD screen is almost certainly locked permanently to 60Hz, ie. it refreshes the screen 60 times per second. Your movie is 25 fps, this means that every 5 frames, quicktime is forced to show the same frame twice in a row. This causes the strobing.

Quicktime will have strobing because vsync is forced on all the time. In the webbrowser it doesnt strobe, but you get horizontal tears through the image.

So, how to fix it.. If this is going to play back from a DVD video, ignore it. It will look fine when played back on a dvd player. If this is to be shown on screen, websites, plasma tv or overhead projector, then your best option is to render out at 30fps.

30 fps divides down perfectly into the lcd's 60Hz and will stop all strobing. Here:

Right click and download this, dont play it in the web browser
http://www.3dfluff.com/files/strobingfixed.mov

[adamdaly]

thanks man thats exactly the situation. But this will have to be played on an overhead projector from a pal dvd. am i stuck or is there a solution?

thanks

adam

[imashination]

Why not make it an ntsc dvd? Every tv, plasma screen, dvd player and projector made in the last 10 years will do both.

Rwegions are only an issue if you artificially add them.

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