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Please…HD experts??!
There are lots of people working in HD with After Effects all the time. I KNOW there must be an answer or solution to what I am experiencing. I have been unable to find any info online.
The setup:
2.5GB G5, 2GB RAM
Rendering from AE with both DVCPro HD and Animation codecs to an extra internal 250GB harddrive
1080i, 29.97 compositions
Image moves and animated maps for a documentary
watching animations in Final Cut via Decklink HD Pro video card to an Ikegami HD CRT monitorMost stuff looks great. However, anything with a fast or extreme move has a great amount of motion jitter in the move (not moire).
I’ve had this problem before in SD compositions, but not to this degree. I am imagining the problem is due to the size of HD….that moving an image left to right in 1 sec in an SD comp, creates a move that is traveling at 720 pixels/sec. Do the same for an HD comp, and your move is traveling at 1920 pixels/sec. So every ‘normal move’ that I am used to creating for SD is actually over 2.5x faster in HD and this high speed is causing my motion jitter.
I’ve noticed a jitter kicks in with SD comps when the move speed gets a lot higher than 100pixel/sec. These are moving MUCH faster than that.
Does that sound like the problem??I have been able to lessen it by various tricks. I’ve shortened the length (speed) of the move wherever possible, I’ve tried different amounts of shutter angle in the motion blur, I’ve tried adding directional blurs to the moves, and I’ve tried adding a bit of a rotational change on moves that are long and straight.
This has not eliminated it though. I have several long moves over gigantic maps that just look horrific during the move.I’ve heard other people complain about motion jitter in SD work before. I’ve found it to definitely be a much greater problem in HD. This is very basic work that I am doing here. I can’t believe that After Effects cannot handle it. I know that it must be ME that is missing something.
How do the high end HD folks deal with this??SOMEONE has to have had this problem before and knows what I am talking about.
desperately,
alisa -
5 Replies
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Hi,
I was just talking to a cameraman this week, and the problem is just typical of HD: you get it as much with filming as you do with motion graphics.
For some reason it’s just not good in conveying horizontal movement.The tricks you use are the same ones that come to mind.
Here’s some extra considerations:
- You use 1080i, so you’re field rendering, are you watching the final rendered output, or Ram-previews
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What type of hard drive is the 250 Gig… more times then less its the hard drive causing this problem the drive cannt except all the throughput and (essentially causes back/skips that you are seeing in the image thats why certain types of raid drives are recommended for HD/ Uncompressed video. The raid drives will except higher amts. of data than regular drives. Despite the fact that you have a deck link card if the files are not stored in a correct fashion then the card is usless for HD/ Uncompressed IN MOST CASES OF PROBLEMS LIKE THIS….’
GOOD LUCK,
Justin P. Junda
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ASK STEVE ROBERTS FOR MORE ADVISE>>>> HE SMART AND MIGHT KNOW OF SOMETHING TO RIG IT UP.
Justin P. Junda
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Thanks for responding.
After going through every possibility, I believe now that it IS my drive. It just isn’t fast enough. I think it is working at 50MB/sec.
I’m looking for economical options right now. I can’t spend a lot because I really only need the faster storage for HD and I will more than likely not have any other HD projects for at least a year. I’d hate to blow lots of money that I don’t have now…..to find it outdated by the next time I needed it!I was told that Medea’s G-Raid Firewire 800 storage is a possibility. However, I am getting some mixed messages from their website.
It says it supports 3 real-time video streams of DVCPro HD, 4 of HDV and 7 of DV streams.
The compatibility chart with Blackmagic does not mention HD capabilities at all though.
The model info page says that the G-Raid has a max data rate of 75MB/sec…..and I’ve read that DVCPro HD is 100MB/sec.How could it support 3 streams of DVCPro if it doesn’t even have a data rate of 100MB/sec?
Any other ideas for low priced storage? I don’t need a lot of space…..just the speed for playback of some animations.
Seems like it goes from $400 for a G-Raid…..straight to $2000 and up for other options. $2000 and up isn’t an option!alisa
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G-raid will flag the HD signal which essentially work the same way as supporting those streams, kind of like how panasonic dvx-100a flags frames at 24p but I reality it is still recording in 29.97fps. Kind of like a false, positive so to speak. BUT ITS CHEAP AND I STILL WORKS I DONE IT PERSONALY.
Justin P. Junda
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