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Shooting non-repeatable events: weddings, recitals, plays, performances...

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Old September 18th, 2012, 05:53 AM   #1
Inner Circle
Join Date: Nov 2008
Location: UK/Yorkshire
Posts: 2,053
Flash induced artifacts

Hi All

As we all have to cope with lots of flashes going off during our shoots - has anyone got an explanation as to why I quite often get (usually when filming in low lights) MPEG artifacts showing the frame before and the frame after the flash - it's not a biggie but I wonder if there is a way around it

Peter Rush is offline   Reply With Quote
Old September 18th, 2012, 06:22 AM   #2
Join Date: Dec 2002
Location: Deep South, U.S.
Posts: 1,317
Re: Flash induced artifacts

Got a notice on this new product that might help Announcing Flash Remover Pro from NewBlueFX
videos: http://vimeo.com/channels/3523
Mark Williams is offline   Reply With Quote
Old September 18th, 2012, 08:09 AM   #3
Major Player
Join Date: Jun 2008
Location: Milwaukee WI
Posts: 559
Re: Flash induced artifacts

Hi Pete,

Are you shooting HDV? I see what you describe when shooting dark wedding reception dances in HDV. This is a Long-GOP format, which means only two FULL frames are recorded each second. In the 29.97fps US format, that means a full frame every 15 frames. What about the rest of the frames? They record partial information, meaning the "changes" from the full frames. So the full frames before and after the partial frames are referenced to get more info to complete the picture. I believe when shooting a dark scene with little picture info, the sudden intense lighting, and accompanying detail, are simply more than the codec is capable of handling so it breaks up into lovely blocks unfortunately.

Some folks like to use an outboard recorder like the Atomos Ninja to pull the HDMI feed out of the camera before it gets compressed, and then record that to more robust, high data rate, intra-frame codec like ProRes 422 that would avoid said compression issues.


Jeff Pulera
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