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How does the playlist_dvr work?

Ricardo 2016-08-02 14:49:50 UTC in Nimble Streamer

Hi,

I just started testing out nimble streamer. I configured a DVR output and I can see the dvr streams being stored into what seems to be separate timestamp directories corresponding to each incoming stream start/stop event.

I had a couple of questions regarding accessing playlist_dvr.m3u8:

- How do these separate directories work?
- Are the streams joined together?
- Am I able to play any of the separate streams individually?

Ricardo 2016-08-02 17:30:29 UTC 

a follow up question, if I have live stream events on multiple days, do I need to manually remove DVR streams to prevent them from being joined together?

Max 2016-08-02 17:34:34 UTC 

Hello Ricardo,

Could you please clarify what you're meaning by "streams"? If you mean multiple streaming sessions to a single RTMP URLs - then it will be played as a single continuous stream in case of using ../playlist_dvr.m3u8 URL.

Ricardo 2016-08-02 18:03:33 UTC 

Thanks Max for your response.

Yes, I mean multiple streaming sessions to the same application/stream_name.

So even if the streaming sessions are on different days, it still comes out as a continuous stream?

I guess this means I'd have to manually remove older content each time I do a new streaming session?

Max 2016-08-02 18:14:58 UTC 

It depends how you're planning to use DVR archive, you can delete it if you'd like to, or you can use EGP interface (http://blog.wmspanel.com/2015/11/dvr-time-range-fragments-epg.html) to select DVR archive fragment for playback (i.e. to avoid to play all sessions continuously).

Ricardo 2016-08-02 18:45:45 UTC 

Got it, thanks.

I guess if we have a continuous session, it might be weird cutting from the end of one session to the beginning of the next, is there some sort of transition effect that can be added when joining sessions?

Max 2016-08-02 19:09:31 UTC 

There will be no any transition effects, the player just continues to play like it is a single stream.

Ricardo 2016-08-05 16:20:19 UTC 

Hi Max,

I'm having a problem generating the mp4 file out of the playlist_dvr.m3u8.

As you mentioned above, the multiple streams are played out as a continuous session, like a single stream. However when I use ffmpeg to generate an mp4, there are a lot of DTS timestamp continuity errors and the resulting file is much shorter in duration than what playlist_dvr presents.

Is there any other method to generate an mp4?

Alex Pokotilo 2016-08-06 11:45:58 UTC 

I'd suggest to run ffmpeg with exact "begin" and "end" interval and may this help.

So run ffmpeg with url like http://you.domain.name/live/stream/playlist_dvr_range-<UTC-start>-<duration>.m3u8

You will get dvr as vod stream and may be this will help in your case

see
http://blog.wmspanel.com/2015/11/dvr-time-range-fragments-epg.html

for details

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