Sample Interval is incorrect

[kurtismash]

Sampler is not async, therefore the sample interval is the configured time in seconds + time for FFMPEG to run.

[Jamie0]

Instead of making this async, you could store the timestamp in which the sampler runs, and then at the end sleep(interval + time_since_last_run - now()).

[kurtismash]

Right now this is completed using a java.util.Timer. If the previous sample has yet to return from gnsdk.lookupStream(), the application waits for this to complete before sampling again. Whilst this is not ideal, it does avoid the need to sequence each sample to avoid receiving track information out of order.