This PR provides support for MSS start-over streams, i.e. live stream that allow to seek back to the start of the program.
Start-over streams manifests are live manifest without DVRWindowLength but with Duration field value, which is then interpreted as the starting DVR window length.
The particularity of start-over streams is that the DVR window range start is not increasing while range end is increasing as usual live streams.
Then it is possible for user to seek back to the beginning of the program.
This PR provides support for MSS start-over streams, i.e. live stream that allow to seek back to the start of the program. Start-over streams manifests are live manifest without DVRWindowLength but with Duration field value, which is then interpreted as the starting DVR window length. The particularity of start-over streams is that the DVR window range start is not increasing while range end is increasing as usual live streams. Then it is possible for user to seek back to the beginning of the program.