Format settings GOP?

[rocka]

Hello!

I am trying to increase my knowledge about x264. On some x264 files I find information about format settings GOP in Mediainfo,
for example: Format settings, GOP : M=1, N=56

I understand the principle of GOP as described here: http://www.webopedia.com/TERM/G/GOP.html ,
and also how to set the GOP size in an x264 file.

What is this format setting and why doesn't it show on all x264 files?

Any reply greatly appreciated

[jagabo]

in x264 you use -b or --bframes to specify the number of consecutive b-frames, -I or --keyint to indicate the maximum GOP size.

Other programs you use M and N where M is the size of BP groups and N is the number of BP groups and I frames per GOP.

M=1, N=5 --> I P P P P - I P P P P
M=2, N=5 --> I BP BP BP BP - I BP BP BP BP
M=3, N=3 --> I BBP BBP - I BBP BBP

[nymph4444]

I use Format Factory to convert my Video Files to other files.
Now I no all Retail DVDs are Interlace because they are for NTSC USA TVs.
This is what I did I Decrypted my Buck Rogers DVDs and they are from the 1970's TV show.

Then I use Format Factory to convert the VOB files to MP4 and put them on my media player that has a 5. inch screen and it works good.
Now when I convert the VOB files to MP4 I have 2. option Interlace and De Interlace I set Interlace to OFF and I set De Interlace to OFF and they play great on my Media Player.

My Media Player is the Mach Speed Trio 5000 and it has an LCD screen.
And I right that LCD screen do not use Interlace and they do not use De Interlace?

[rocka]

jagabo: thank you very much for your reply. Much appeciated

[JN-]

in x264 you use -b or --bframes to specify the number of consecutive b-frames, -I or --keyint to indicate the maximum GOP size.

Other programs you use M and N where M is the size of BP groups and N is the number of BP groups and I frames per GOP.

M=1, N=5 --> I P P P P - I P P P P
M=2, N=5 --> I BP BP BP BP - I BP BP BP BP
M=3, N=3 --> I BBP BBP - I BBP BBP

Should N not be 9 and 7 respectively for the 2nd. and 3rd. line examples ? or is it that there are two different ways to represent the same GOP.

I’m trying to establish for certain that the non B frames gop is indeed called M = 1, thanks for any input to this.