There is no direct correlation between GOP size and quality, since it only defines how often keyframes occur. If we assume that the P-frames in between the keyframes are perfect (ie. Lossless), then GOP size doesn't affect quality. Having said that there may be some rare cases in which there is some effect. For example, if your video is extremely noisy, the codec cannot generate good P-frames. This could cause the video to become blocky. Over time, errors may add up. In such cases, having more keyframes could reduce the amount of accumulated error. Of course, this is a rare occurrence. For the most part, there is no direct correlation.
Hello and thank you for your comment! I'm not entirely sure either as I've never heard of it! What context does the book use it in? I found something here, but it seems that "N" refers to GOP length. Not sure if it's the same as what you've seen: forum.doom9.org/showthread.php?t=167216
Hello, thank you very much but I actually figured it out. The "N" in "N-frame" is like "X" in an algebraic equation. So an N-frame image is an image made up of "some number" of smaller images.. So if you look up the poster to The Tree of Life, that would be an N-Frame Image. Once again thanks for taking the time to try to help!
Hello and thank you for your comment! We typically only include one i-frame in each group of pictures (so don't end on an "I"). Other than that, both are valid ways to do GOP.
![Summer Walker - Heart Of A Woman [Official Lyric Video]](http://i.ytimg.com/vi/SFddctbZzw8/mqdefault.jpg)
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The first video that really helped me to understand the point of GOP. Thanks a lot!
You're welcome! Very happy to be of help =)
Wow, did not expect this kind of quality from a smaller youtuber. Great video!
Hello and thank you very much for your comment! Very happy to be of help =)
Does a bigger gop size mean less quality btw? Or doesn't GOP affect quality?
There is no direct correlation between GOP size and quality, since it only defines how often keyframes occur. If we assume that the P-frames in between the keyframes are perfect (ie. Lossless), then GOP size doesn't affect quality.
Having said that there may be some rare cases in which there is some effect. For example, if your video is extremely noisy, the codec cannot generate good P-frames. This could cause the video to become blocky. Over time, errors may add up. In such cases, having more keyframes could reduce the amount of accumulated error.
Of course, this is a rare occurrence. For the most part, there is no direct correlation.
Thanks, the more i know ;P
Cheers :)
Thank you so much! That is what I always wanted to understand! Helped a lot!
You're welcome! Glad to be of help =)
Wow, what a clear explanation! Thank you :)
You're welcome! Very happy to be of help :)
I needed that one term. well-explained.
Hello and thank you for your comment! Glad you liked the video :)
This video helped me to understand GOP ..thank you
You're welcome! Glad to be of help =)
Great video! Well described and thoughtful explanation.
Hello and thank you very much for your comment! Glad you liked the video =)
I have an exam on this in two days, you're a godsend my friend.
Hello and thank you very much for your comment! Glad to be of help, all the best for your exam =)
really good video! Thanks for that :D
Cheers! Glad you liked the video =)
Thanks man, you're great.
You're welcome! Very happy to be of help =)
What is an N-frame? I heard it mentioned in a book and can't figure out what it is. Good video btw.
Hello and thank you for your comment! I'm not entirely sure either as I've never heard of it! What context does the book use it in?
I found something here, but it seems that "N" refers to GOP length. Not sure if it's the same as what you've seen: forum.doom9.org/showthread.php?t=167216
Hello, thank you very much but I actually figured it out. The "N" in "N-frame" is like "X" in an algebraic equation. So an N-frame image is an image made up of "some number" of smaller images.. So if you look up the poster to The Tree of Life, that would be an N-Frame Image. Once again thanks for taking the time to try to help!
Hello again! Glad you figured it out!
Really awesome video.. thanks!
You're welcome! Very happy to be of help!
Nice explanation. Thank you.
You're welcome! Glad you liked the video.
GOP1:12
is it
IPPPPPPPPPPPI
OR
IPBPBPBPBPBPI
Hello and thank you for your comment! We typically only include one i-frame in each group of pictures (so don't end on an "I").
Other than that, both are valid ways to do GOP.
hola kevin chow
Hello and thank you for your comment! No idea who that is =P