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Constant need to Render
I am doing a project with multiple streams (all same frame size, same vid rate etc), using multiclip. I have all media on RAID esata drive (Seritek 2EN2 with their card in computer).
Each time i place the multiclip in the timeline, It says that the entire thing needs to Render (green line at top of timeline). After I Render, it seems to want to play fine, but when choosing different angle, that one needs to render. If I choose back to previously rendered angle, it needs to render again.
All sequence settings seem to match clip settings. Can someone explain this to me?
Thanks
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7 Replies
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Have you got any filters applied to your original clips? Green line can imply a filter that FCP will attempt to play realtime but may have trouble with if you are trying to play multiple streams. Double check your sequence settings though cos a green line can mean a difference in formats that FCP will attempt to play on the fly.
“Is it me or do I spend half my life watching little grey bars turn into little blue bars??”
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Thanks for the feedback. It turns out that the difference in this session from the others I have done is that I decided to transfer at Apple ProRes 422 this time. I think the 5 streams was just too much for the rig I use. I re-transcoded the footage to the original codec we have been using (DVCPro HD 720) and it seems to be working fine.
Not sure if I had any filters on. Don’t think I even know how to do that 🙂 Would there be something on that I would not be aware of? We do pretty straight forward edits of music performances. Don’t think I have messed around with filters before.
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Well, for example sometimes people decide to colour correct a camera angle before they add it to the multiclip sequence so they don’t have to do it clip by clip later. Depending on the filter you add to the clip, FCP will either try and play it on the fly or force you to render it first. one 3 way Colour Correction filter is generally ok but 2 or more filters will certainly slow you down and depending on the desired filters will most likely require a render. (Depending on your RT system profile)
If I remember rightly, Prores is about 14Mb/sec so 5 streams of that and you are at 70MB/sec plus 10-15% for system process requirements, you’ll need to be running ESATA drives minimum just to keep up! Your green (preview) line probably came from you using Prores on sequence set up for a different video format so add the realtime rendering required to play Prores on the fly plus bandwidth required for the Prores streams and yeah, your system may start to weep a little bit!“Is it me or do I spend half my life watching little grey bars turn into little blue bars??”
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Gottcha. The problems I was having seemed to stem from using Apple ProRes on the first try. I then went back to my old standard of DVCPro HD, and things seem to be OK now.
I run esata drives (siritek 2EN2 with their card installed) – but it’s software RAID, and I know that makes it not as slick.
Another upgrade to think about in the future…
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Your RAID is probably fine. What you were probably butting up against was the CPU requirements to decode 5 streams of ProRes in real time. ProRes is very processor intensive especially with HD material. If you wanted to stay in ProRes you can switch your RT settings from High or Dynamic to Medium. ProRes respects your RT settings.
Jeffrey Di Lullo
Jeffedits.com -
Even that didn’t help – it really seems like this computer is just not dealing with the Apple ProRes. Went back to DVCPro HD, and I’m back in action.
Thanks for all the help everyone.
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Sorry, I wasn’t more specific. Dropping the RT setting would only help you with dropped frames. It would still retain the green render bar.
I agree that DVCpro HD is where you should be. Have a great day.
jd
Jeffrey Di Lullo
Jeffedits.com
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