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MJPEG-A Playback (Aurora Igniter through Io)?
Hello:
While poking around the Io website I came across a PDF from September of 2005 that describes how to play back MJPEG-A video through the Io. The PDF describes how to properly tag the field order of the video and states that the Io can play back both upper and lower field first MJPEG-A video. But how do they define “playback?” When I bring video into FCP 4.5 encoded with Aurora’s MJPEG-A Igniter card the Io will display the video on my NTSC monitor (Video Playback set to ProIO-NTSC US-Component YPbPr SMPTE N10-8-bit 422 (720×486)), but when I try to play the video it looks strobey, like it’s the wrong field order. I’ve tried flipping the field order in After Effects to lower field first but that doesn’t help. Is there some button I should be clicking in the Io control panel or elsewhere? Do I need a newer version of FCP to do this?
It would be nice if I could edit this MJPEG-A video smoothly through the Io, especially in the future since Aurora’s apparently stopped making the Igniter card. We mainly do motion graphics, and the Io works great when I need to capture uncompressed video from our Beta SP deck. We usually render out our animations as Avid Quicktimes (for our clients to import into their NLEs) along with an MJPEG-A version to play through our Igniter card. I like using the Igniter since it produces nice video at smaller file sizes, and I have years of animations archived as MJPEG-A, upper field first Quicktimes which I use to edit our demo reels and such.
Thank you.
Shawn Marshall
Marshall Arts Motion Graphics -
3 Replies
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Hi Shawn,
Try loading the Igniter preset for MJPEGA on the machine with the IO box. It is located under library-application support-FCP system support-custom settings. I used the Igniter NTSC 10M/sec setting and it seemed to play fine, although I had to render the clip. I hope this helps. Good luck.
John
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Thanks for the replies.
Jeremy: The PDF to which you’ve linked is the one I referenced in my original post. The PDF says “We have code in our M-JPEGA support to allow playback of 720×286 SD Upper Field Dominant (“Even”) clips-such as those captured by Aurora.
So, my question is, how do they define “playback?” If they mean smooth, full motion NTSC playback I’m not getting that. If they just mean I can get choppy video out to my NTSC monitor, I’m getting that, but that’s not ideal.
John: My hope was that I could play these Igniter MJPEG-A clips through the Io box smoothly and without rendering. I think you can pretty much play anything through anything if you render it. I’m using a preset for my Igniter clips (720×496, Upper First, Aurora MJPEG-A codec) with the video playback set to ProIO-NTSC US-Component YPbPr SMPTE N10-8-bit 422 (720×486). The clips do play through the Io on my NTSC monitor, but they’re very strobey. I don’t think it’s dropping frames, but it’s hard to tell.
Maybe I should send this to Io support.
Shawn Marshall
Marshall Arts Motion Graphics
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