Add HLS replay of streams

[dams92210]

Describe the feature

Actually in the config file the HLS segments of a stream can be recorded in a folder (hlsDirectory) . But as soon as the stream has ended, there is no possibility to replay this HLS stream.

It would be great to add a feature so that a client application could implement a DVR functionnality on recorded HLS streams, a bit like the youtube live feature.

In detail:

• Adding an hlsDVR: yes / no parameters would add the possibility to keep all needed files of the HLS stream:
  • record all m3u8 files generated in memory (index, video and audio tracks) in the hlsDirectory folder
  • keep all segments files in the hlsDirectory folder instead of being wipeout as soon as input stream has ended.
• Adding an hlsDVRAddress: ip_port parameters would add the possibility to replay the stream, just by serving the recorded files as an http(s) server on this port address.

Example:
A stream called myStream is recorded in the [hlsDirectory]/myStream folder. Then accessing to [ip_of_mediamtxserver]:[hlsDVRAddress]/myStream/index.m3u8 with HLSjs would replay the stream.

Why this request and not using the existing record/playback feature?
The record / playback existing features does not solves the "immediate replay in multiple languages" of a stream. The record needs to be remuxed as multiple audio tracks is only supported with the experimental features flags depending on each navigator.
So I don't think this would compete with the actual record/playback feature.

Did I try to solve this myself?
Yes, I am trying to implement a grab of all segments and all m3u8 files but this is far from ideal in terms of ressources needed.

What can be the drawbacks?
If a stream is relaunched with same name, then it would override the existing files, but that an expected use case.