Creating the best quality Blu-Ray possiable

[Peter Gregg]

Also have never heard of it !!

I am filming at 25fps pal but when I feed it direct into my projector it shows as 1080p 50fps Why is this ?

[Joe Marler]

24 or 25 fps source is more susceptible to judder when panning or during rapid subject movement. If 25 fps source is output from a modern digital projector at 25 fps, you’ll see some judder in the above cases — especially on a large screen. Cinema directors of photography are trained to minimize this when shooting — they know how fast they can pan and how fast a subject can move at a given focal length and camera-to-subject distance before risking judder.

One modern solution is motion smoothing but there are many different types of smoothing algorithms. Some work better than others. The motion smoothing (aka frame interpolation or motion interpolation) can be done during render, by the playback device or the viewing device. For many decades there was no motion smoothing in the theater — The DoP just had to shoot it right.

Re your projector saying 50 fps, there are several possibilities: your NLE project might be 50 fps and when you imported the 25 fps material it conformed it using some algorithm, probably frame repeating. When rendered or played from the Mac it is actually outputting 1080p/50, with each frame repeated twice.

Another possibility is your NLE project and output file are 25 fps, but the projector is doing frame repeating. Check your projector documentation and see if you have adjustable settings for this. Maybe it’s using an “auto” setting and for some reason it switched to 50 fps.

Anytime the material is confirmed, filtered or converted there’s a possibility of degradation. Normally I wouldn’t expect that for frame repeating, but you never know.

So you apparently have two separate issues: the frame judder problem and the quality degradation. They may or may not be related; you’ll just have to experiment and see.

[Peter Gregg]

That’s great thank you .
To be honest the “judder issue ” is fine as its not there when my project is burnt onto a bluray .

The quality issue I need to look further into and like you say experiment . I will check that my project is not been converted into 50p in fcpx etc .
What is the best codec to use in fcpx for the best quality ? Time and size are not a worry as I would just rather get the last grain of quality .

Thanks again for your help

[Peter Gregg]

I have bought a new bluray burner and now can burn direct from fcpx . Help please with the settings as losing quality in my workflow .