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If you have a .mp4 file encoded as 3gp (not a .3gp video), it will not be accepted as a valid video file. I believe this encoding is used when sending a video via MMS/iMessage and over a cellular network.
First bytes of a .mp4 video that works:
First bytes of a .mp4 video that doesn't work:
This is from
PHP:
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First bytes of a .mp4 video that works:
ftypmp42mp41mp42isom
First bytes of a .mp4 video that doesn't work:
ftyp3gp53gp5isom
This is from
XF\Http\Upload::analyzeVideo()
:PHP:
Code:
$mp4Ftypes = [
'avc1', 'f4v', 'iso2', 'iso6', 'isom', 'mmp4', 'mp4v', 'msnv'...
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