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Strange vertical moiré patteren on encoded video?

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Janus Vinther
Strange vertical moiré patteren on encoded video?
on Jun 20, 2011 at 1:34:42 pm

Can anyone tell me why I get a vertical moiré pattern when I encode from HDV (1080i-50 PAL) to DV-AVI and subsequently to MPEG2-DVD (for normal DVD-burning).

The reason I don't go directly from HDV to MPEG2-DVD, is that on my computer it takes about 42 hours to encode a full 100 minute video. I think the long encoding time is because the HDV-format is filled with color grading effects (Magic Bullet), so I decide to export to tape (DVcam) and then capture the edited movie to a DV-timeline (which would include the color graded effects in the video and in fact that the MPEG2-format is lower than the DV-AVI it should be ok).
It kinda worked, from an encoding-time perspective, and the encoding time to MPEG2DVD only took about 1 hour, but the result was ugly and ended up with a vertical moiré pattern distorting it.

Does anyone know why this could be, and which of my settings could be wrong to cause this?

Sincerely, Janus.

Janus Vinther


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Daniel Ludwig
Re: Strange vertical moiré patteren on encoded video?
on Jun 20, 2011 at 4:59:15 pm

Janus,
one reason might be, because of wrong field-order.

HDV has upper, DV(Cam) has lower field first.

I would use MPEG Streamclip instead to downscale your video to SD. it´s a free application that could be downloaded.

easy to use and available for PC and MAC.

so export your HDV-film as selfcontained film, then use Streamclip to downscale it to SD using foto-jepeg codec and upper field first, encode your SD-film to MPEG2 (with upper field first) for DVD then author.

cheers

danny


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