“boxes”, fields? introduced

[Mads Nybo jørgensen]

Hey Olivier,

Is it correct understood that the source footage plays back fine, without the large banding on it?
And is it a specific file that gives you trouble, or is it random when it is happening on exporting the Sequence.

Out of interest, why are you exporting to these settings “sequence settings: 420×486, Lower fiel first”.?
Have you tried other Sequence output settings, to see if you get the same result.

Can you post an actual video clip to look at, as a still does not give the whole “picture”.

Atb
Mads

[Olivier Prudhomme]

Hey Mad

I can’t share a clip because it is work material

The original file plays well: in QuickTime, in the source monitor and in the sequence.

It is only after I export that this happens

The specs are our delivery specs and they always work fine for other episodes of that show and other shows, all SD

[Mads Nybo jørgensen]

Hey Olivier,

Correct me I’m wrong, but your picture looks like Jack Klugman in Quincy, M.E.?
A Glenn A. Larson / Universal Television production, and very enjoyable to watch.

Quicktime player is dead gone for most users using Quicktime library clips, unless you are on an old Mac or PC. Apple decided that the QuickTime codec was not upgradeble and potentially a security risk – WMV as a Windows codec appears to slowly fade into history too.

VLC, not perfect, but still seems to play everything.

Back to “Quincy” – likely to have been shot on 35mm, and then transferred to Video-tape for transmission across the NBC network. Or could in the early days been “projected” out from a film master. As I still don’t know where you have your file from, one can only guess that at some stage in the transfer from analogue to digital, that the engineer got the settings wrong.

Short answer based on a qualified guess: You are seeing a fine picture everywhere else, because you are likely playing only a 1/2 frame (field) of the video in the monitor, including on the master monitor (some might call it half-resolution progressive 🧐😀). Where as the Sequence is happily reading the fields “wrongly”, which is why you only get the surprise when watching your exported clip.

My suggestion is that you set up a subequence showing only one field, and drop the problematic clips into that, before overlaying onto your current master Sequence. Hopefully the good and “bad” footage will come out without the blocking on them.

There are plenty of other ways to fix this, if that doesn’t work.

Atb
Mads

PS: This might be of help:
https://helpx.adobe.com/uk/premiere-pro/using/interlacing-field-order.html

helpx.adobe.com

Interlacing and field order

Learn to convert progressive to interlaced video in Premiere Pro.

[Olivier Prudhomme]

Quincy it is! 🙂

Very interesting explanation.

I am exploring changing the fields so they all match at least, between the sequence settings and the export.

I wil also check out the links you shared.

I sincerely appreciate the time you spent sharing your knowledge

Best