Interlace visible randomly for one frame?

[guyburns]

Attached are three frames from a test capture of Hans Vonk being interviewed in St Louis. The middle frame shows interlacing, and the frame seems to be one line lower than the frames on either side. These jumps, sometimes up, sometimes down, happen randomly, maybe 2-3 times per minute on average, sometimes within seconds of each other, at other times minutes apart.

If I crop the bottom and top in Premiere, the jumps are not really noticeable, but when played as is, they are reasonably obvious if you're looking for them.

Ques: are the jumps likely to be due to the camera or the tape, or are they capture artifacts? The attachment was trimmed within Quicktime Player 7, not from within Premiere.

[lordsmurf]

Corrupt sample.

[gunzel]

QuickTime Player on my M2 Mac will open it but it shows the timeline as 00:54:08 to 00:54:10. VLC doesn't like it at all.

I guess it is the way that QuickTime is clipping the file?

[traal]

Using the technique described here, the eyes look better but above the eyes and below the nose, the fields are still misaligned. Misaligned fields can usually be fixed, but not this particular one.

[guyburns]

Thanks for the replies. As per LS, I suspect corrupt samples on tape.

I forgot to say it's a ProRes file and you need to be able to step through it frame by frame. On a Mac, QT can do that with the arrow keys.

There won't be anything wrong with the way QT7 Pro trimmed it, the best little video app ever for trimming, replacing audio, exporting in various formats; simple things like that. Shame that Apple discarded it.

I'll upload again in a more user-friendly format. What is the best format so that a video can be played on a PC and a Mac, and can be stepped through frame by frame?

[lordsmurf]

I can step through H.264 in MP4 just fine in VirtualDub2. All it needs is adequate bitrate, and non-aggressive GOP.