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Problem with interlacing during output
Hi everyone,
I’m having the strangest issue with interlacing during output. When I output uncompressed or compressed or any which way, I’m getting the occasional flash frame appearing in between cuts (I’m editing multiple dv clips ripped from DVDs of various interlaced/progressive sources). Whats odd, however, is that I’m not seeing these flash frames in final cut – only outputted movies. It appears that the video is progressive when viewed in final cut but the output is interlaced, giving me these flash frames. Annoyingly, if I select ‘deinterlace source video’ in QuickTime Conversion, the output still appears interlaced and still has flash frames. The ONLY way I’ve been able clear this problem is by exporting from final cut and then importing that movie into MPEG Streamclip, whereby I’ll re-export it using Streamclip’s de-interlace option. I don’t understand why final cut is incapable of outputting video as it appears within the sequence timeline.
Can anyone help?
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4 Replies
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Footage was ripped from various DVDs into dv-pal interlaced (as most DVDs are interlaced anyway). I can solve the problem either by setting the sequence to ‘none’ under ‘field dominance’ but this gives me jaggies that aren’t as apparent as when the footage is exported natively interlaced. Is there any deinterlacing filter available that keeps visual quality relative but rids of these interlaced additional frames showing?
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The film is for a projection off a mac running an uncompressed QuickTime. I’d imagine what I see on a monitor is what I’ll get in the QuickTime projected?
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Ripping PAL DVD to DV means swapping field order. All PAL codecs except DV are upper field. By swapping fields you are probably seeing a rouge field on cuts. On an external monitor this would be obvious. On the FCP viewer, as Jerry said, you will only see this with the viewer on 100%
If the end result is being seen only on a computer screen then you should deinterlace the final, which can be done by setting frame controls in Compressor. As you say it is being projected, you may not need to deinterlace. Never assume that your projection will look the same as quicktime player on a comptuer screen. Gamma settings are likely to be totally different.
My advice for the future is to avoid DV codec and rip to ProRes 422.
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Thanks for everyones help, but I still wonder why it is that ripping DVD material (as in films) cannot seem to be properly converted no matter what I do into what looks to be a deinterlaced image. I’ve imported the same vob from the same ripped film into mpeg streamclip, and exported 1 PAL DV file and 1 ProRes file. The image features interlace scan lines in both formats – one upper field dominant, the other lower. I’m not quite sure what to do but apply a deinterlace filter.
Also, in terms of a final output from a DV timeline, is the Animation codec my best option for lossless video or should I go 8bit uncompressed on account of a few speed changes/filters applied. Is uncompressed a better option if deinterlacing is going to be applied?
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