Video Quality/Resolution Problem in Gstreamer

[pisymbol .]

On Tue, Aug 6, 2019 at 4:51 AM Ian Davidson <id012c3076 at blueyonder.co.uk>
wrote:

> You asked "What is a Key Frame?"
>
> If you think of a typical TV picture, much of the image stays the same
> from one frame to another.  You could create your video file by storing
> each frame in its entirety - but in order to reduce the overall file
> size we use 'Key Frames' and 'Delta Frames'. The Key Frame has all the
> pixels required to make up the picture - just like a still photo. That
> key frame will then be followed by a series of Delta Frames which simply
> note the differences from the previous frame.  If your video is of a
> news reader reading the news, the delta frames would detail the mouth
> moving and not much more.  If you were to try to pick up your video in
> the middle, you would have the detail of the mouth moving - but you
> would know nothing about the news reader's face.  Therefore, you need to
> include Key Frames from time to time to enable starting 'part-way through'.
>

Ian, isn't the Key Frame also the start of what is known as a Group of
Pictures (which is a complete set of Key and Delta frames)?

-aps
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