Handle video metadata

[GuillaumeGomez]

An integration can be made here with the video-metadata-rs crate.

However, like said in the README, video-metadata-rs is using the version 3.x of FFMPEG libraries. So the libs have to be built and installed manually (well, I guess it's not really an issue but I prefer to make a note about it). I think it could get downgraded to 2.x version quite easily but I think it's better to use lastest version.

I think I resumed all information about it. If you think I forgot something, please tell me! 😃

I'll start to work on it in the next days.

cc @jdm

[jdm]

If they're available in standard package managers (apt, dnr, brew, and mingw) then it shouldn't be a problem. Otherwise, it's going to be more difficult, since at minimum there's the cross-platform automated builders to consider.

[GuillaumeGomez]

That was my point. Otherwise I'll create a 2.8 branch.

[GuillaumeGomez]

Ah great news, there are packages for linux, OSX and windows!

[est31]

It supports reading metadata of all major codecs inside the Ogg container (opus, vorbis, theora): https://github.com/est31/ogg-metadata

[clstl]

Had issues compiling on OSX El Capitan today. Had to build ffmpeg from sources and soft link it, so that cargo sees it. The new Homebrew version puts everything in /usr/local (having it in PATH does not seem to help)

[GuillaumeGomez]

@clstl: Some people reported this issue here.

[clstl]

@GuillaumeGomez I cloned from master a few hours ago and the issue was present. Some more people have it as well on OS X.
here

[metajack]

The issue is that while pkg-config is used to determine if the libraries are there, it only uses the linking information, not the include directories. We just need to add those. I'm working on a patch now.

[nox]

The crate audio-video-metadata currently returns informations about a single track in the passed media, it should return informations about all of them.

[GuillaumeGomez]

I'm gonna need to take a look (it should return all tracks).

[est31]

@GuillaumeGomez my ogg metadata crate should return all tracks it can find. If that doesn't work or its not enough, please say so!

[GuillaumeGomez]

I think the error comes from audio-video-metadata. I'll need to investigate!

[ferjm]

IIUC this was fixed with the addition of servo-media. Please, reopen if you consider that this issue is still valid.