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Encoding NTSC 29.97FPS material produces weird interlacing problems

gianluca

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I'm trying to convert NTSC Video material from DVD encoded at 29.97 frames per second.
I'm converting using the iPod (hires) profile, using version 1.1.5.4.
Output to a 640x480 and all other parameters are left to default values.

The output file is an MPEG-4 video at 24FPS, which has motion problems: I can see interlaced fields problems especially when there's horizontal motion.

So I tried to create a new iPod (hires) profile by making a copying of it in devices.ini, and I called it "iPod Video 5. gen (hires 29.97FPS)".
I added the following two lines to it:
NTSCFrameRate1=29.97
NTSCFrameRateDeinterlace1=29.97

After creating a new file with this new profile I noticed that it is an MPEG-4 at 29.97FPS, but I still see the motion problem as before.

Is there a way to setup a profile that does not have this problem?
I suspect there's a conversion from 29.97, down to 24 and then back to 29.97, somewhere in the conversion chain.

I do understand that I can turn on the "deinterlace video material" option, but this option degrades the video quality quite a bit, makes the video fuzzy and not as sharp as the original, and I don't like that.

Thanks,
-Gianluca.
 
Last edited:
I do understand that I can turn on the "deinterlace video material" option, but this option degrades the video quality quite a bit, makes the video fuzzy and not as sharp as the original, and I don't like that.

Well, but that's you option. Deinterlacing will always degrade the quality, that's inevidible. And if a device is not designed to play interlaced material, you have to deinterlace.
 
Ah...once again my fault, because all this time I thought that the iPod could play interlaced video.
I did some further research and found out I was wrong, indeed.
 
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