Not all mp4 are recognized

[sam1111]

Hi,

I am attaching an mp4 file which is not getting recognized correctly. the mimetype returned by module comes as undefined.
videoplayback.mp4.zip

[t1st3]

@sam1111, getting some info about the file with mediainfo, I get this kind of output:

General
Complete name                            : videoplayback.mp4
Format                                   : dash
Codec ID                                 : dash
File size                                : 4.57 MiB

Here is the output for the .mp4 fixtures in this project:

Complete name                            : fixture.mp4
Format                                   : MPEG-4
Codec ID                                 : M4V | mp42 | isom

I don't know much about mp4 files, but it appears that .mp4 files may contain various codecs, and that's why 4 different fixtures are already needed.

Wikipedia has 2 separate pages about mp4 and dash:

• mp4
• dash

Seems that dash is a bit different from traditional mp4 while keeping the same extension.

[mifi]

I have added DASH as mp4 (as file identifies it).

65f0017

However there are still many other mp4 variants not yet detected by file-type, see #99