* Add video file metadata via ffprobe
* Federate video file metadata
* Add tests for file metadata generation
* Complete tests for videoFile metadata federation
* Lint migration and video-file for metadata
* Objectify metadata from getter in ffmpeg-utils
* Add metadataUrl to all videoFiles
* Simplify metadata API middleware
* Load playlist in videoFile when requesting metadata
This patch adds an audio-only option to PeerTube by means of a new transcoding configuration which creates mp4 files which only contain an audio stream. This new transcoder has a resolution of '0' and is presented in the preferences and in the player resolution menu as 'Audio-only' (localised). When playing such streams the player shows the file thumbnail as background and disables controls autohide.
Audio-only files can be shared and streamed just like any other file. They can be downloaded as well, the resulting file will be an mp4 container with a single audio stream.
This patch is a proof of concept to show the feasibility of 'true' audio-only support. There are better ways of doing this which also enable multiple audio streams for a given video stream (e.g. DASH) but as this would entail a fundamental change in the way PeerTube works it is a bridge too far for a simple proof of concept.
* #1915 Add a subject to contact form and add it to email sent
* #1915 Add subject to contact form tests
* #1915 Contact form test corrected && tslint correction