What does closing the GOP mean ?

[TheShadowKnows]

Hello All, I am using smart ripper to rip > Xmpeg 4.2a to encode with CCE 2.64 > In the settings of CCE 2.64 if I close the GOP, the result is lines that blur the motion.
If I do not close the GOP, the picture looks good.
What does closing the GOP mean, and should It be on or off in a perfect world?
Thanks

[Anonymous65]

Closed GOP is used when editing is needed where all information about the video stream is saved every frame. GOP is Groups Of pictures. Mpeg video use inter-frame compression, where one frame is dependent on the previous and following frame. GOP normally have I, P and B frames. The I frame is a full complete frame, and you can make an edit on that frame. The distance in frames between the I frames is called the GOP.

It looks to me that when you record the mpeg with a closed GOP, you loose data normally used for video information, and the video quality will be lower. Whatever happens, the video quality looks worse with a close GOP setting.

[TheShadowKnows]

Thanks for the explanation, this sheds new light on what the GOP does. So I could say that regardless of the software I use to encode I would not want to close the GOP?

[BodyMaker]

You would need to close the GOP's If you want to add chapters when using programs such as VCDeasy to Burn the (S)vcd

If there is a quality difference it must only be very slight because i have never noticed the difference

[Anonymous65]

There should only be a difference in video quality on low bit rates. At high bit rates, you should not see any difference.

[BodyMaker]

Thanks Skittelsen that explains it then