Video Quality/Resolution Problem in Gstreamer

[Ian Davidson]

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'.

I hope that helps.

Ian


On 06/08/19 06:31, budakf wrote:
> Hi
>
> I tried to add  *... ! decodebin ! identity drop-buffer-flags=corrupted !
> ... *. However, there is no difference.
>
> I use gstreamer-1.4.5 and H264 as codec. Also, What is key frame ?
>
>
> Thanks
>
>
>
> --
> Sent from: http://gstreamer-devel.966125.n4.nabble.com/
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