MP4Box - "OpenGOP detected - adjusting file brand"

[kotuwa]

I see this when muxing with MP4box.
OpenGOP detected - adjusting file brand

I got this some time ago and getting this again.

When I use never version of GPAC MP4BOX, I get this.
Same video stream, when muxed using an old mp4box build, it does not show this.
In the video encoding, CLI used and no entry for Open-GOP is given. That means it used none, the default right?
Also, All muxed files made by both mp4box builds show "open_gop=0" in mediainfo.
What is this?

[Jamaika]

Why you created an a new topic? Are you hoping that someone will answer so negatively worded question?
Topic dead:
http://forum.doom9.org/showthread.php?t=94874
http://forum.doom9.org/showthread.php?t=170918
Topic where you can write your complaint. I don't know if there is the related with some charges.:
https://github.com/gpac/gpac/issues

[Selur]

also more infos regarding what is multiplexed with what settings and mp4box version might also be a good idea,...

[kotuwa]

Why you created an a new topic? Are you hoping that someone will answer so negatively worded question?
Topic dead:
http://forum.doom9.org/showthread.php?t=94874
http://forum.doom9.org/showthread.php?t=170918
Topic where you can write your complaint. I don't know if there is the related with some charges.:
https://github.com/gpac/gpac/issues

Thanks for the links...

Searching 'mp4box' in threads did not gave the thread regarding mp4box.
http://forum.doom9.org/search.php?searchid=7475465
(The thread has no tags and looks like title is skipped by search)


also more infos regarding what is multiplexed with what settings and mp4box version might also be a good idea,...

The message appeared in "MP4Box - GPAC version 0.5.2-DEV-rev1092-g6f3bf8f-master".

And NO such message in "MP4Box - GPAC version 0.5.1-DEV-rev4929" and "MP4Box - GPAC version 0.5.2-DEV-rev70-g0da07c9-master". (For same A/V).
Before, i got this with a version which was older than rev70. (Thought would find some, who also faced this).

Video is x264 720p AVC L4, Audio AAC LC Stereo.
Command
mp4box -add vid.h264:name="AVC x264" -add aud.m4a:lang=eng:name="English AAC" out.mp4

:thanks:

[raffriff42]

It's a status message, nothing to worry about.

Open GOP (https://en.wikipedia.org/wiki/Group_of_pictures)s are not really a problem. MP4Box is either fixing it (closing the GOP) or flagging it as open; I'm not sure which.

Open GoP and Closed GoP
http://forum.doom9.org/showthread.php?t=146492

[Jamaika]

In your case may not irrelevant information for the GOP because it is the x264 codec. However, as I wrote earlier codec information should be correct.
Worse as it is codec X265 and will have more than 8bit or i444 or opengop. Then surely the movie will be bad play when changing position. It is better to use ffmpeg.
mp4box -new -info -add vid.h264:fmt=H264:fps=???:name="AVC x264" -add aud.m4a:lang=eng:name="English AAC" out.mp4

[kotuwa]

:thanks:

[SeeMoreDigital]

Here's a thought...

How about moving Jamaika's post (#489) and subsequent replies out of my GPAC MP4Box Information, Feature Requests & Discussions [No bug reports] (http://forum.doom9.org/showthread.php?p=1733082#post1733082) topic and into this topic ;)

[sneaker_ger]

OpenGOP in MP4 is not really recommended anyways. Muxers and demuxers and even the specs themselves can be problematic.