-
OT presenting non-square 601 as 4×3
How to reliably make 720×486 interlace Qt “present” as 4×3 progressive?
I’m preparing to do some archival work to capture NTSC video from analog tape and create digital files. I’ll do my capturing with an Avid MC which creates 601 interlace files that are 720×486 with rectangular pixels. I’ll most likely transcode to make some 4×3 progressive deliverables (ProRes, mp4).
My question depends on the client. If I’m doing this for one that is a savvy video post client they know how and when to use 601 interlace Quicktimes. For less technical clients I fear these files will be mishandled. What I’m describing is a way for this Qt to play and at least look right, but it is a partial answer at best.
In Quicktime Player 7 I can adjust the Movie Property Settings to make the mov play (aka present) as 640×486 Display Size and check the deinterlace box. I do that, save the changes and it looks good in Qt 7. When I play that same modified Qt in the regular Quicktime Player (10.1 on a Mac) it is not longer 4×3 = fail.
In another forum someone said “Almost all modern audiovisual container formats have means to declare non-square aspect ratios so that 720×486 could be presented at 720/486, 4/3, 16/9 or whatever aspect ratio the presentation should use” Is there a more bulletproof way of achieving this?
Before I post again in that forum I want to a little more research, so would appreciate any input.
Thanks,
Paul
-
2 Replies
-
QT7 and QT10 are pretty much unrelated technologies at this point. QT7 is basically EOL.
QT7 is based on QT Frameworks and QT 10 is based on AVFoundation. The don’t handle frames or flags the same way.I would target 640×480 and test in QT 10 and WMP 12. WMP 12 can play H.264 .mov files.
640×480 is a “universal” 4:3 Standard Def frame size. -
Thanks Craig, got it. Where then, in what software app, would I set these playback specs (4×3 & deinterlace) with an eye towards them respected aka being adhered to in a modern player? I don’t see anywhere to do that in Qt 10. Again these are real-time, on-the-fly playback parameters. (not changes made in a derivative copy)
Paul
Reply to this Discussion! Login or Sign Up