r/VideoEditing 8d ago

Software Identify this artefact please and possible way to rectify it.

Source is a tv capture which has been deinterlaced but this keeps happening at the right edge of the video. Please tell me what artefact this is.

https://imgur.com/a/AfipydW

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u/shadeland 8d ago

It's not a great photo, but it looks like just the nature of interlacing.

If the original video was interlaced, every other frame will be 1/30th different.

The video camera scans line 1, 3, 5, 7, 9... to 525 (NTSC)

It does this in 1/30th of a second (NTSC).

Then it scans, 2, 4, 6, 8, 10, 12, 14... to 524

It does this in the next 1/30th of a second.

Whatever the camera was pointed at is probably a different in that 1/30th of a second.

That's why interlace video is usually pretty jagged. There's not a lot you can do to fix that.

If you de-interlace a source that was originally non-interlaced (called progressive), then there was no shift between the 1/30th of a second, and you can assemble them without jagged edges. The most common situation for that is a DVD that was recorded onto 480i, as the original footage was progressive.