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Prores 422 Optimized by MPEG Streamclip?

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Jay Evs
Prores 422 Optimized by MPEG Streamclip?
on Feb 15, 2011 at 9:09:56 am

Sorry if this is a dumb question, but I just bought a SONY NEX-VG10 so I need to clear this up before I get my workflow happening with this new camera.

Importing from the NEX is no problem, everything goes straight into Prres 422. But like I've mentioned before, the clips seem to work a LOT more smoothly if I take those Prores 422 files and run them through MPEG Streamclip to export as the same format. Can anyone explain to me why this is? I feel a bit stupid for adding this extra step (and about 30% more storage space required) to my workflow, but I do love the increase in performance. No idea how its being achieved though??

Any input would be great.

Thanks guys,

J


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Shane Ross
Re: Prores 422 Optimized by MPEG Streamclip?
on Feb 15, 2011 at 9:56:24 am

[Jay Evs] "But like I've mentioned before, "

Where? I don't see a post on this.

[Jay Evs] "the clips seem to work a LOT more smoothly if I take those Prores 422 files and run them through MPEG Streamclip to export as the same format. "

Wait....you use Log and Transfer to convert to ProRes...and then go through MPEG STREAMCLIP to convert the ProREs to ProRes? Why? Can you describe what you mean by "more smoothly?" And you know that by doing this, you are adding yet another layer of compression to your footage? What is wrong with the clips you converted the first time?

[Jay Evs] "Can anyone explain to me why this is? "

Nope, as I have no clue what you mean.

[Jay Evs] " I feel a bit stupid for adding this extra step (and about 30% more storage space required) to my workflow, but I do love the increase in performance. "

What increase? What is happening to make it better? I don't understand.

Oh, and what hard drive is this footage stored on? Connected how?

Shane

GETTING ORGANIZED WITH FINAL CUT PRO DVD...don't miss it.
Read my blog, Little Frog in High Def


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Jay Evs
Re: Prores 422 Optimized by MPEG Streamclip?
on Feb 15, 2011 at 10:01:22 am

I know it sounds weird, but after using log and transfer i am not satisfied with how the clips scroll i.e. when i scroll through them with the mouse, its smooth but not liquid smooth. it lags.

But, kind of by trial and error, i realised that if i put those clips from log and transfer through MPEG Streamclip (and yes i know this compresses them again but i cant tell the difference in quality), the clips then became much more responsive.


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Shane Ross
Re: Prores 422 Optimized by MPEG Streamclip?
on Feb 15, 2011 at 10:31:46 am

What are you converting to the first time? The second? How does this ADD to the file size? If they are the same compression, shouldn't it be the same size? Are you recompressing to ProRes LT or something?

Shane

GETTING ORGANIZED WITH FINAL CUT PRO DVD...don't miss it.
Read my blog, Little Frog in High Def


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Jay Evs
Re: Prores 422 Optimized by MPEG Streamclip?
on Feb 15, 2011 at 11:36:57 am

im using log and transfer which brings the clips in from the camera's ACVHD format and automatically converts to pores 422.

Im not sure why the Streamclip Prores 422 files are larger, i am converting from prores 422 to prores 422 (just normal full quality settings, not prores LT or HQ). I assumed that maybe streamclip has different settings somewhere to apple which made a different file size.


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Philippe Domengie
Re: Prores 422 Optimized by MPEG Streamclip?
on Feb 15, 2011 at 12:53:36 pm

Let me guess ... Is your original file at 1440*1080 ? It would explain that MPEGstreamClip output is 1920x1080, so bigger and smoother (no interpolation).


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Chris Tompkins
Re: Prores 422 Optimized by MPEG Streamclip?
on Feb 15, 2011 at 1:36:23 pm

When you say "scroll" do you mean in the L&T window?
I wouldn't worry about that.

L&T the files in and have your "Capture Scratch" set up properly and your clips will play correctly.
Double converting/transcoding/compressing is not the answer.

Chris Tompkins
Video Atlanta LLC


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John Pale
Re: Prores 422 Optimized by MPEG Streamclip?
on Feb 15, 2011 at 1:42:40 pm

Are you sure L&T isn't set to convert to ProRes HQ or 4444?
What you are describing is certainly weird.


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Jay Evs
Re: Prores 422 Optimized by MPEG Streamclip?
on Feb 15, 2011 at 2:20:16 pm

yep absolutely sure. i know this is weird, thats why im also confused.

does anyone else in these forums have a NEX-VG10?


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Jay Evs
Re: Prores 422 Optimized by MPEG Streamclip?
on Feb 15, 2011 at 2:19:40 pm

what do you mean by having my capture scratch set up properly?

I put the files exported from streamclip into exactly the same location in the scratch as where the L & T puts them. yet they behave differently.


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Jay Evs
Re: Prores 422 Optimized by MPEG Streamclip?
on Feb 15, 2011 at 2:18:22 pm

no the origina files are indeed the same size at 1920 X 1080


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Chris Tompkins
Re: Prores 422 Optimized by MPEG Streamclip?
on Feb 15, 2011 at 2:22:14 pm

When FCP creates the .mov files they are put on the drive(s) you set in scratch disc settings.

Are they on a Array?
External drives?
Internal drives?

This will affect playback.

Chris Tompkins
Video Atlanta LLC


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Jay Evs
Re: Prores 422 Optimized by MPEG Streamclip?
on Feb 15, 2011 at 2:30:26 pm

yes, i have an external striped RAID 4TB, firewire 800.


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