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Multicamissues.. lots of source cameras, and tons of lag.

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Jon MelotMulticamissues.. lots of source cameras, and tons of lag.
by on Mar 16, 2016 at 5:50:28 pm

Hello all,


I'm working on a multicam edit of a live music performance. There were 4 of us filming and we did multiple multiple takes. As a result I have about 30 cameras. They are all synced up, and I'm setting up my multicam edit sequence. Not surprisingly, playback is uselessly sluggish and pretty much non-responsive even at the lowest playback resolution. This is to be expected, I'm sure.

Most everything is off of DSLR, so it is mostly mov files. I'm on a Mac Pro with 32gigs of RAM. I'm running an external scratch (firewire) and all my work files re on another external firewire disc (not solid state). Any tips on how I might get through this edit? Is there a proxy work flow I should be working in so that I am using smaller files to begin with? Any pointers would be much appreciated.


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Alex UdellRe: Multicamissues.. lots of source cameras, and tons of lag.
by on Mar 16, 2016 at 6:35:34 pm

What resolution is the ftg?

IF.....

that number of streams can be done at all....

needs to be on an SSD or RAID that is connected via FAST connection

(like SATA or Thunderbolt)...

more RAM would be helpful for sure...


OR....

I don't know whether this can be done without:

1) Proxy transcoding source down to something like DV widescreen codec
2) creating multicam from that
3) cutting that multicam
4) duplicating that multicam edited sequence
5) flattening the edit (meaning exposing the underlying mutlicam source for each edit)
6) and then relinking the source back to your full res material


I'd think that's the only way you're gonna get a stream count approaching what you need to make the edit.

Alex Udell
Editing, Motion Graphics, and Visual FX
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Jon MelotRe: Multicamissues.. lots of source cameras, and tons of lag.
by on Mar 16, 2016 at 6:58:16 pm

Yes,

I figured I might be chasing a pipe dream. I know I can always go with the old multi-camp edit way and just cut through the expanded layers!

In answer to your question, all the footage is 1920*1080 It is living on an external RAID that is connected by firewire. More RAM would be great, I'd love to max this computer out once the funds are in place.

I was figuring a proxy workflow like you outlined might be the way to go. Any other thoughts? Thanks guys!

-jon


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Tero AhlforsRe: Multicamissues.. lots of source cameras, and tons of lag.
by on Mar 16, 2016 at 7:12:34 pm

You're running 30 tracks of pretty heavily compressed format that needs a lot of CPU power to decode and your firewire RAID can't probably keep up with the data rate. You need a format that's easy for the CPU and has small enough bit rate that you could run it.


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Herb SevushRe: Multicamissues.. lots of source cameras, and tons of lag.
by on Mar 16, 2016 at 10:32:37 pm

You can't cut multicam on a firewire connection.

Herb Sevush
Zebra Productions
---------------------------
nothin' attached to nothin'
"Deciding the spine is the process of editing" F. Bieberkopf


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Jon MelotRe: Multicamissues.. lots of source cameras, and tons of lag.
by on Mar 16, 2016 at 11:40:57 pm

That's correct. I miss-typed.. it's connected by thunderbolt.


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Herb SevushRe: Multicamissues.. lots of source cameras, and tons of lag.
by on Mar 17, 2016 at 12:02:03 pm
Last Edited By Herb Sevush on Mar 17, 2016 at 12:01:43 pm

[Jon Melot] " I miss-typed.. it's connected by thunderbolt."

If your raid is thunderbolt connected then you should be fine for most multicam setups. According to your original post you had 4 DSLR cameras at 1080 but you shot multiple takes - are you trying to create a multicam with 4 angles or 20 angles? If your dealing with MP4 or any long GOP codec you'll have problems with 20 angles and should consider transcoding to something like ProRes Proxy and then re-linking. As long as the file names are the same then re-linking is a breeze.

Herb Sevush
Zebra Productions
---------------------------
nothin' attached to nothin'
"Deciding the spine is the process of editing" F. Bieberkopf


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