Live stream latencies

[benhylau]

We have touched on the topic of how real-time this stream is, so I want to start documenting here.

Playing from ipfs-server m3u8 (origin):

Playing from m3u8 on ipfs-mirror:

Playing from m3u8 on ipfs-mirror but ts chunks from ipfs.infura.io:

In all cases observed latency is between 1 to 1.5 min, although I have seen as much as 2 min occasionally.

[darkdrgn2k]

Latency improved a bit when we removed FFMPEG re-encoding form the pipeline
#76

Last test test i did show 20-30 seconds

[mercora]

apparently the RTMP server is setup to create 20s fragments so i am going to assume that's where most of the latency comes from. is there a good reason not to go lower with the fragments length?

[benhylau]

It's the minimum we can go based on how fast IPFS can pin. If we go much lower we build up a queue IPFS can't consume fast enough. 20s is what we found acceptable.