Optimize nginx & recordings

[NickM-27]

• Use faststart for recordings segments
• Use threading in nginx
• Reload video on first error while viewing recordings

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[blakeblackshear]

A couple tings we should look into:

• providing keyFrameDurations for the clips from the database (would need to add a field to the db)
• using the concat clip type

[blakeblackshear]

I don't think keyFrameDurations looks useful. Maybe setting discontinuity to false could be helpful.

[NickM-27]

I don't think keyFrameDurations looks useful. Maybe setting discontinuity to false could be helpful.

Isn't it already false? https://github.com/blakeblackshear/frigate/blob/dev/frigate/http.py#L1139 or do you mean setting that somewhere else too?

[NickM-27]

Tried out concat but it doesn't seem to make a difference, also found this: kaltura/nginx-vod-module#264 (comment)

Concat filter is very similar to using multiple clips with discontinuity set to false, the added value it provides is that the duration of the mp4s can be different across different sequences.

So seems it may not be relevant since we only have one sequence

[NickM-27]

Can't move forward with DASH as it is not supported on iOS

[blakeblackshear]

One other thing we could do is prefetch the next hour's playlist ahead of time so VOD will populate the metadata cache. That may get rid of the loading when going to the next hour during playback.