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
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