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Horizontal Lines in DVD
Hi there,
I have run through this forum and many others looking for a solution, but am unable to find one that works for me.
The problem, as far as I can tell has something to do with interlacing lines.
My project was created as follows:
– Filmed the footage in HD on a Sony Z7 (DV-Pal)
– Captured in to Final Cut in HD
– Produced the clip (Roughly 25 minutes) in a DV-Pal timeline
– Exported as a self contained Quicktime Movie, with Lower Field Dominance selected.Up until this stage, I can play the captured clips, the sequence in FCP and the exported clip in Quicktime, in all of which they play perfectly fine, in a nice quality.
I then have taken the clip in to Compressor and used the DVD – 90min (Best) on it. Once I just used the default settings, the next time I went in and changed the relevant settings to Compensate for Motion. I also tried re-exporting with Upper Field Dominance.
Once I open DVDSP, and bring the clip in, if I play the clip in here, there is horizontal lineage around the points of motion. This makes me think it is obviously something I am doing in Compressor, I just don’t know what I am doing wrong. If I burn this to DVD, then play on my 40inch Samsung LCD, the horizontal lines are very very obvious.
Any help would be appreciated guys. Like I said, if the clip plays without any distortion up until I import the compressed clip in to DVDSP, this makes me think something I am doing in Compressor is wrong. But I am not positive.
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4 Replies
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Also, I do not know if it is relevant, but the time line is anamorphic.
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Plenty of chances for field dominance to be screwed up with your workflow. Firstly I presume you shot HDV even though you said “- Filmed the footage in HD on a Sony Z7 (DV-Pal)” and also because you said you captured it into FCP as HD. If that is true, then the field dominance should be set to upper for the captured files.
If you then edited those HDV files in a DV sequence, the shift fields filter would need to be on all the clips as DV is lower filed as you have identified. Then, when you exported the QT file, what codec did you choose? If it was DV then it should be lower. Any other codec should have been upper in PAL.
Have you at any stage seen the sequence or you QT file on an external interlace monitor? If not, then you might have the fields problem baked in before making your mpeg file for DVDSP.
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I went through and checked all the things you listed above, and went ahead and applied the shift fields filter, compressed and burnt off to a DVD and it works perfectly, thanks for that!
So am I right in assuming that every format in PAL uses upper field dominance, except for DV? And just to make sure dominances always match in a timeline, then I shouldn’t have any problems? Or is this just for TV? Would it be a different story if I was outputting to web?
Thanks again for your help, best explanation of the problem I’ve seen.
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Yes Adam, in Pal only DV is lower field. Standard def broadcast and DVD is interlaced. If you are preparing for the web, then a deinterlaced quicktime is best.
There are various ways to deinterlace. Some here like the Compressor deinterlacing. I use Nattress filters to deinterlace, although I only work in broadcast at the moment so rarely have need to deinterlace a whole program, just the odd shot for effect.
Glad to have helped and sorted the issue. If you avoid DV then life is easy in PAL.
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