video/mp4 sniffer rule

[nephele]

I have a mp4 file that does not seam to be catched by the sniffer for filetypes, as a consequence it does not get metadata assigned if i play the file, unless i add a .mp4 extension in which case it does get video/mp4 attached for BEOS:type.

This seams to be a problem with mp4 version 2.

[NullAndVoid]

I can reproduce the problem with the attached mp4-file.

The file signature is 66 74 79 70 6D 6D 70 34 (ascii ftypmmp4) with an offset of 4.

[nephele]

Upon further investigation it seams that this are the tasks:

• fix current sniffer rules to ignore offset
• fix current sniffer rules to be case-insensitive
• add ftypmp41 ftypmmp4 ftypisom (not-spec conform) ftypiso2 (not spec-conform)

reference: ​https://ftyps.com Aswell as just sniffing stuff on my computer, ftypisom for instance isn't allowed according to the iso spec apparently, but ffmpeg produces those files, for example. (​http://www.ffmpeg-archive.org/ISO-mp4-Major-Brand-field-non-compliant-td4677987.html)

That should be the rules, the ftyps website also lists ones for nero, but i am not sure how relevant those are.

I am not quite sure how to go about making the sniffer rules case-insensitive or how to make them ignore a specific offset though.

[nephele]

Patch

[pulkomandy]

Applied in hrev53541.

[nielx]

Assign tickets with status=closed and resolution=fixed within the R1/beta2 development window to the R1/beta2 Milestone