Communities

Writing
Writing
Codidact Meta
Codidact Meta
The Great Outdoors
The Great Outdoors
Photography & Video
Photography & Video
Scientific Speculation
Scientific Speculation
Cooking
Cooking
Electrical Engineering
Electrical Engineering
Judaism
Judaism
Languages & Linguistics
Languages & Linguistics
Software Development
Software Development
Mathematics
Mathematics
Christianity
Christianity
Code Golf
Code Golf
Music
Music
Physics
Physics
Linux Systems
Linux Systems
Power Users
Power Users
Tabletop RPGs
Tabletop RPGs
Notifications
Mark all as read
Q&A

How can the total size of all frames of a video > that video's size?

+1
−4

I commanded Free Video to JPG converter to convert every frame of some .mp4 into JPGs. One .mp4 of 131 MB got converted into pictures totalling 700 MB! Another .mp4 of 377 MB got converted into pictures totalling 1.0 GB!

Undeniably, these pictures all hail from the video. Thus I'm bewildered by this Emergentism! How can picture frames from a video outstrip that selfsame video itself?

Why does this post require moderator attention?
You might want to add some details to your flag.
Why should this post be closed?

1 comment thread

Videos are normally compressed. You can imagine this as reusing elements. If the same element is pres... (1 comment)

2 answers

+6
−0

Due to "compression".

The video is highly compressed. Some of that compression makes use of the picture not changing much from one frame to another. When you extracted individual frames, such compression couldn't be applied.

Why does this post require moderator attention?
You might want to add some details to your flag.

0 comment threads

+5
−0

As already noted in another answer, the answer is compression. But it is actually much more than you might think. A typical video has a huge amount static from frame to frame. Even an "action" video (e.g., sports) will actually have only a small part change from frame to frame most of the time. In fact, if this were not the case then a single moderately sized video (e.g., YouTube) playing might require a Gigabit connection to display (e.g., 1280 x 800 x 24-bit color x 30 frames/second = 737 Megabits per second).

Keep in mind that the JPEG format itself includes significant compression. If you instead saved those images in the PNG format, you would find the same video taking many Gigabytes of storage. (The exact size will depend on resolution, color depth, frames/second and length of video.)

Why does this post require moderator attention?
You might want to add some details to your flag.

0 comment threads

Sign up to answer this question »

This community is part of the Codidact network. We have other communities too — take a look!

You can also join us in chat!

Want to advertise this community? Use our templates!

Like what we're doing? Support us! Donate