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Question

Data used in Premiere Pro?

Forum|Forum|7 years ago
February 8, 2019
3 replies
839 views

I am wondering what kind of data is used when I upload a video into the program all the way till when I export my creation? This is being used for a school project. I know it uses the actual video and audio tracks but what specifically goes into that?

Thank you!

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Mo Moolla

Legend

Hi Jake

There isn't any real data as in bandwidth data.

Let's take an example.

You have shot some footage on a camera which now is on a memory card.

You put that card into you MacBook and then copy it to your local drive.

Lets say that footage size was 2gigs in size

You then open up Premiere and import the footage into Premiere.

You will be importing 2 gigs worth of data files into Premiere. This isn't the same as data like bandwidth data. Its simply the files you are bringing into Premiere.

However it's impossible to estimate the size of the output file as it will depend on your edit, the output codec etc etc.

The only time you will be using the traditional bandwidth as you call it is if you are uploading your finals to Youtube, Vimeo etc.

I trust this helps

Mo

S

SAFEHARBOR11

Participating Frequently

"You will be importing 2 gigs worth of data files into Premiere"

Not importing any data...nothing being moved...just pointing to the corresponding video file already on the hard drive. The Premiere project size does not increase by 2 gigs.

That said, Premiere will do some audio conforming which generates some "temp" audio files, that's a different story though.

Thanks

Jeff

John T Smith

Community Expert

Also, PPro does not alter your original video file

The PROJECT file you create contains commands about what to do to your video file... those commands are carried out when you export to create a new, edited file

S

SAFEHARBOR11

Participating Frequently

I agree that of course Premiere does not transcode or alter the original video clip, and the "Project" only references (points to) the original clip. However - most video clips are compressed in one way or another, using various codecs/compression, and frame rates and resolution of clips may not necessarily match the Sequence sometimes (when mixing clips). Premiere cannot actually "display" the frames of the video source to us in their native format any more than our television displays a DVD or Blu-ray video frame to us in an MPEG format. It de-compresses each frame of source video into an uncompressed video stream and then sends to display for viewing.

So - when we hit PLAY on scrub the timeline, Premiere must access (read) the desired frame from the source clip, and then must convert it to "something" in memory to send to display output. Not that any kind of file is written to the drive or any codec is used, but frames must be processed and delivered up "on the fly" for viewing. For instance, you add a color effect to the video then play it - the color corrected frame MUST be generated on the fly to view it, since it doesn't physically exist anywhere on the hard drive - it is generated "on demand".

And perhaps that is the question, what are the specifications of that frame?

I use the Newtek TriCaster realtime video production switcher and all video inputs are processed internally as "4:4:4:4, 32-bit Floating Point". For instance if an effect or transition is taking place in the switcher, the frames being manipulated are using those specs.

So what is Premiere using? Did some Google searches and did not find, maybe Adobe staff can chime in here?

Thanks

Jeff

R Neil Haugen

Legend

I don't know what Pr uses for general preview during playback, but do know all Lumetri internal color calculations are in 32 bit float. They input the original media data into the system, convert to 32 bit float, do calculation then convert back to the media's original depth for monitors.

The right side scale on the scopes looks like they use data levels 0-255, but that ONLY shows how the images are mapped to the monitor. If you switch Parade to YC or Waveform to YUV, the right-side scales change to video levels 16-235, which is what most Rec.709 media is.

They don't change the scale numbers when dealing with 10 bit media, but the reality then is the 16 graticule becomes 64, and 235 becomes 940.

Neil

Everyone's mileage always varies ...

Ann Bens

Community Expert

First of all you do not upload but import or ingest. Uploading means transferring data from e.g. computer to web.

Premiere does not use the actual video and audio but makes links to the file on the hdd.

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