Allow plugins to handle the scrub requests

@Zip,

Would it be possible that the plugin handles a "custom" scrub/seek request instead of ffmpeg? Right now, you add -s <timeinseconds> to the ffmpeg process. Some streams, however, like the Serviio Mediabrowser itself, use a custom argument to start at a specific time.

For instance, the fmovief site, which has http://blablabla.mp4 as "normal" url, and http://blablabla.mp4?start=<timeinseconds> to start from a certain point. Would be excellent if we can handle that using the plugin.

Not sure if this is a clear request, or if it's even possible.

[zip]

Doesn't the ffmpeg -ss the rame results?

As far as I know, ffmpeg -ss does a byte range request, using e keyframes to calculate an approx. position. This only works, of course, if the remote stream does support byte range request. Not all of them do...it's possible that these streams are exotic, in which case I'll have to solve it using a shell script...