Quote:
Originally Posted by PCU
Because until a few months ago, MediaInfo showed x264 specs.
|
The reason why MediaInfo and similar tools can show "x264 specs" is that the x264 encoder,
by default, embeds that information into the H.264 stream, as a
custom SEI message.
H.264 decoders simply
ignore this "unknown" custom SEI message. MediaInfo knows what to look for and how to interpret it. Anyway, the custom SEI message is
not needed by any means; it's just some "diagnostic" information.
Therefore, x264 could trivially be modified to
not write the custom SEI message. Or the custom SEI message could be
removed – intentionally or incidental – by whatever MP4(?) muxer they use.
So, as Blue_MiSfit already pointed out, the lack of x264 custom SEI message
alone is
not a prove that the stream wasn't created by x264. An x264 developer probably could tell by looking at the stream in detail though...