RTSP Absolute date time seeking with fragmented files

[ivan.roubicek]

Hi I've a RTSP server which works as a VMS recording server. I have a TS
files fragments (recorded by splitmuxsink) and database which stores
metadata for each fragment like fragment id, start time and end time.

Right now I'm able to load fragments (using splitmuxsrc) and stream them to
client as if it was one large video file. Now what I would like to do is to
implement seeking by datetime. I would like to ask you what would be the
best way to handle seek request from the client (range header) so I can load
correct TS fragment and seek in it to a specific position.

Let me explain on an example:

Let's say I have 3 chunks with metadata like so:

FragmentId | StartTime | EndTime
1 | 24.3.2017 11:20:00 | 24.3.2017 11:30:00
2 | 24.3.2017 11:30:00 | 24.3.2017 11:40:00
3 | 24.3.2017 11:40:00 | 24.3.2017 11:50:00

And client sends me Range header with datetime 24.3.2017 11:35:27. I would
have to load fragment 2 and 3 (to a splitmuxsrc) and seek to 00:05:27.

Can you please suggest me a way of implementing such feature? 

Thank you very much for any response
Kind regards Ivan



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