HUGE HORIZONTAL LINE ISSUE (DVX footage)

S

scribbles

Active member
hey everybody, i'm looking for feedback from someone who has noticed a similar problem, i see it all the time with dvx footage on the internet.
the best way i could describe it, is that it looks like there are huge horizontal lines going across my footage. it doesnt show up on tv when i watch the footage, and it doesnt show up in the final cut. ONLY WHEN I EXPORT IT USING QUICKTIME H.264 CONVERSION.

EXAMPLE:GROSS HORIZONTAL LINES


does this have to do with field dominance?(fields were set to lower, however the lines seem to get worse when i turn field dominance to 'off')
interlacing???(even though it was all shot progressive)

Settings:
30p
shutter speed of 1/60th
dvx100B
 
Hmm- that's a really odd effect. I've not seen that before. If I didn't know better I would see it's a lens flare or reflection into the lens. But if you can't see it on another type of output it could be some new sort of compression artifact. I'd suggest exporting out of FCP first as 10-bit uncompressed then converting to H.264 in Compressor and see if it still happens.

Noah
 
during the time lapse shot of cars driving there is reflection because it was filmed through a window and i was standing behind the camera hah hah. but thats not what im concerned about, its those painfully obvious horizontal lines. i will try what you suggested, however i'm new to compressor i am afraid to attempt anything haha
 
Definitely an issue with how you're exporting the footage. Since you say it looks fine on your TV then you know the camera's not at fault and the footage isn't at fault; it's happening when you make the output file.
 
Oh- you mean the way the cars look for example- that's interlacing. You have a setting in there somewhere that's set for interlaced and it should be set to none/progressive.

Noah
 
god this was really killing me, thankyou so much for your help seriously. so i did what you said Noah, exported fully uncompressed from final cut, then used compressor H.264 compression and those gross lines were gone.
just one or two more quick questions:
-i understand quicktime h.264 compression does a very good job of compressing files for the internet. its what i have always used and i'm happy with it. however, now that i'm using this new method you suggested to compress using 'compressor', i am confused on how to get the highest quality video possible. could you please quickly outline what exact setting i should choose for exporting quicktime h.264 video for the web? thankyou!!!
2. when i'm editing in final cut, why should field dominance be set to 'off'. i understand the footage is progressive and there is no interlacing, would that be why? because i occasionally shoot 24p but i dont reverse telecine it, so i can use it with 60i footage in a 29.97 timeline. what should the fields be set to then? sorry for my ramblings, honestly if you could give me an answer it would help enormously

evan
 
Well it depends what your shooting format is- 24p edited at 24p should be set at field dominance none. For 24p with pulldown intact within a 60i/29.97 timeline (and also mixed in with 60i footage if desired)- use field dominance lower. For 30p use none. The p is for progressive as opposed to interlaced.

Compressor has similar settings to FCP for H.264, just bring up the inspector from the Window menu. You can also just use the presets. You can also open the uncompressed file in the QuickTime player and you'll then have an identical interface to FCP's for exporting to H.264 if Compressor is a bit daunting. I go over all this stuff in great detail with animations and all kinds of goodies in my DVD btw. :)

Noah
 
hahah, well thankyou very much for your help honestly you guys are just filled with information, this sight is a heaven send. i feel happy you just solidified everything i already knew, its good to hear from others with much more experience(i am only 17)
 
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