Quick Question on Bitrates

[Trancer]

Hi all,

I have recently been testing with KMPlayer to make sure its the media player for me :) So far so good!

I have a question though. When playing a HD .mkv for example, happens with different files. If you display the information OSD so it overlays the file info as it plays. It says saomething like Video: Input 6,000KB/s but output is only something like 256,000KB/s. Bith values constantly change, and im doing this from memory so values aren't 100% correct.

So the question is, why is the output bitrate so much less than the input?

My concern is basically that the quality of the files is being reduced? I dont think this is a problem with my setup as it happens on differnet computers, just want to know why its displaying this.

Thanks in advance.

[mouse]

why is the output bitrate so much less than the input?
Did you read it correctly? Output bitrates must be alway larger than input bitrates as it is a decoded data stream .

Input 6,000KB/s (6MB) <<<<<<<< output 256,000KB/s. (256MB)

[Trancer]

Right I see, that could well be the case, I was looking at it wrong.

Why is this? Could you explain further please?

[mouse]

as it is a decoded data stream .

It's a bit technical which is hard to understand if you are not familar with video encoding and decoding. The bitrate information of KMP seems not perfectly calculated depending on the status of KMP video transform filter. Actually, it's a mathematical calculation while decoding on the fly. The input bitrates represent the compression rate of video stream while the output bitrates indicate the decoded rate.