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View interlace flicker on LCD display?
Hi all,
I’m just wondering if there’s any way to view interlace flicker or field order issues on an LCD display? When I edit footage (various formats – could be Panasonic P2, DV, Canon 7D files, etc) and export it for broadcast (MPEG-2) it always looks fine on the timeline when beign edited and also looks perfect in the final rendered file when played in VLC player…
But I’ve seen some of the bits I’ve done on air and they seem to have really bad field order issues – that jerky motion during movement. I export to MPEG-2, Upper field first, 25mbps CBR, as this is the required format for TX.
Any suggestions on how I can check the footage beforehand? I’m editing & exporting from Premiere CS5, my main monitor is an LCD and I monitor out from a Matrox box to another LCD. It appears I can’t see these issues until they finally go to air, which is obviously a huge issue.
Any suggestions?
Thanks.
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7 Replies
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I usually check with the both fields switched on, but DV is always Lower Field First so that may be all the problem is stemming from.
Otherwise, as a final check I watch back in VLC and make sure to manually uncheck the field deinterlace to keep all fields running then when the fields are wrong it looks like the picutre bounces back and forth each frame, because techinally that is what it is doing, the field order is showing the action with the wrong field 1st therefore bouncing 1/2 a frame in time fwd the back, then fwd then back. If it’s correct it will be all forward. The fields might make it look “messy” but its not bouncing back and forth.
It will still show on an LCD if the fields are both active on playback at 100% with VLC.
– JB 🙂
Jon Barrie
aJBprods
Jon’s YouTube Tutorial Page
follow Jon with twitter -
Great – thanks Jon.
I heard you could do it in VLC alright, but could never find the option. On the current version of VLC player, where is the option for “uncheck the field deinterlace“?
All I can find is Settings > Preferences > Video > Filters > Deinterlace – and then the options are “Discard, Blend, Mean, Bob, Linear, X”. Or am I in the wrong part of the menu??? :/
Thanks in advance!
Sean.
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It may also depend on the processing in your LCD monitor. I use a JVC-Pro LCD monitor (via an AJA board), which absolutely does show interlaced signals properly in HD or SD (or improperly, if I screw up!). I believe some consumer LCD monitors process everything to progressive– which is OK for consumers, but not for producers. Wish I could be more specific for you.
-Jeff
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You would select “disable”.
🙂
Jon Barrie
aJBprods
Jon’s YouTube Tutorial Page
follow Jon with twitter -
Hi Jon – can you please read my post above? I don’t have a “disable” option – only what I listed. If there is a “disable” button, can you tell me how to find it?
Thanks for your help.
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This is the Mac Version 1.01
Check the image to see where the option is.
– JB
Jon Barrie
aJBprods
Jon’s YouTube Tutorial Page
follow Jon with twitter -
Okay – thanks!
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