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I'm brand new to video so I don't even yet have a favorite software package.

In general, on popular software like FCPX or Premiere, how many MB per minute of 1080p will I need?

I realize there are a hundred different ways to compress the video, but I'm just asking about the rough storage requirements for a typical editing workflow.

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2 Answers

up vote 2 down vote accepted

Original video material

It depends on the protocol and color formats as well as the mentioned compression, but if you're starting in video I assume you're using HDV. A rough estimate based on the HDV format (the one you transfer over the FireWire cable) will give you around 19.2 Mbps (ironically less than the DV format), or 138 Mb per minute.

If in the higher end you can end up with f.ex. HDCAM at 440 mbps (the double with SR1 docking).

But if we use the former as a basis you can store about:

10 minutes with 1.35 GB
30 minutes with 4.04 GB
60 minutes with 8.09 GB

However, this is for compressed video and audio. In practice the files tend to be around 50-60% larger due to various factors such as the audio being converted to uncompressed audio at 16-bit (optional 24-bit on some cameras), 48 kHz.

So conclusively, if you calculate using 12-13 GB per hour you should be fairly safe for 1080i using HDV original video.

Editing

Editing involves referencing the original video in most cases and when you convert it a final product you will probably use a different compression format such as H.264 (mp4, mov etc.).

However, if the editor need to conform the video (f.ex. for use of complex effects) and audio, these files tend to take a noticeable amount of storage.

But this depends entirely on your pipe-line. If you involve 3D graphics/animation in it, then you grow the project considerably more. If you plan to add voice-over, music and so forth you will use even more space.

Give yourselves comfortable space on the disc, say (holding finger in the air to find wind direction) 3-4x the project's length for a good start.

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The most complete answer is probably to simply describe the way data rates are calculated. Basically all HD video uses some amount of compression, but the simple algorithm is to take the number of horizontal pixels times the number of vertical pixels times the color depth (in bits) times the frame rate to get the raw, uncompressed data rate per second.

For 1080p 24bit color at 30fps, this is 1920x1080x24x30 bits per second or 186 megabytes per second of uncompressed video. That makes 671 gigabytes per hour for an uncompressed stream at 24 bit color and 30fps.

The level of compression typically used can range anywhere from 1:3 to 1:300 so you could be looking at anywhere between 230gb an hour to 2.3 gigabytes for an hour (and possibly even less if they compress really heavily.)

The acceptable level of compression also depends on the format used, the compression options chosen and the level of movement and similar color areas in the video. So it really is extremely hard to estimate without an idea of what you want to work on with it.

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