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FPS changing between Handbrake and Vegas

EddieDean

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So I have a primary source, which is in 23.976fps (an 1920x800x32 AVC .mp4), which Vegas is correctly reading in 23.976fps.

My project and render settings are the same, and when I open this source in Vegas my frames are perfectly on the 23.976 beat.

I have a secondary source to splice in, which is also in 23.976fps (1920x800, but an .mkv), which Vegas won't read.

So, I convert it in Handbrake. Settings are .mp4, 1920x800, H.264 (x264), 23.976fps.

This produces a .mp4 secondary source, whose metadata clearly shows as 23.976fps, 1920x800.

But this secondary source, when I open it in Vegas, shows the media's metadata as 25fps. And the frames are offset from the 23.976 beat, which introduces blurry frames.

What am I missing?
 

addiesin

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I don't think you can fix a "broken/invalid" file by converting it. I think you'll need to source a working file to start from.

I also don't recommend using Handbrake to create a file for editing, that more useful to encode a compressed delivery format for clips or your finished edit. Compression and editing don't mix nicely.

Where are your files coming from? That will determine the best way to prepare then for editing.
 

DigModiFicaTion

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Here's a trick you can do.
Click properties on the video file, then set the undersample rate to 0.8
That should set the fps to 23.976 fps
 

EddieDean

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Ah, DigMod, that's done the trick, thank you again!

Addiesin, thanks for the info. I'm steering well clear of Handbrake for producing collateral - generally I'm creating smaller projects and using those to create clips. But I had a couple of files in the wrong format, so I've been grabbing short clips (a few seconds) using that, with it set at its placebo settings. Those have seemed to turn out identical to the originals thus far.
 

Captain Khajiit

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The clips might look identical to the originals, but addiesin is right that you should convert your source files to an intermediary codec for editing.  Editing a delivery format is generally inadvisable.
 

EddieDean

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Appreciate that. So what formats are typically considered intermediary/lossless?
 

Captain Khajiit

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Lagarith is commonly used here, especially by Vegas users.  Some people use ProRes (near lossless).  The codec that I use depends on what I am doing.  There's a fair amount of research/learning involved in editing properly.
 

lapis molari

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A detail in Handbrake that's easy to overlook: the default setting creates a variable frame rate (yep, besides a variable BIT rate, Handbrake also wants to give you a variable FRAME rate). Select Constant frame rate instead.
 

EddieDean

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Khajit: "There's a fair amount of research/learning involved in editing properly."

That's helpful, thanks. It'd be great to be directed to the best learning resources.

And thanks, Lapis, that's useful too.
 
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