Consultation about Low Latency HLS player

[gu9694]

What do you want to do with Hls.js?

Hi, I'm a developer of Apple Low Latency HLS and I try to use hls.js-1.1.5 to play my Low Latency HLS stream.
However, I find that after each playback starts for a period of time, the hls.js player will stop request and play big segments, instead of partial segments.
I'm wondering in which scenario, the hls.js player will stop request partial segments and begin to request big, completed segments. It is possible for me to correct my output Low Latency HLS stream, if I know the reason why the hls.js player behaves like this.

What have you tried so far?

No response

[rikhwanto]

I was trying to play LL-HLS stream from OvenMediaEngine with hls.js demo page and I encountered similar behavior. At first hls.js played the stream perfectly, but after playing for a while the player kept stalling. I checked my browser's network requests and found out that hls.js was requesting large complete segments instead of smaller partial segments or chunks. I assume that the server hadn't had complete segments ready yet when hls.js requested it because it took too much time between the browser request and server response for said segment, hence why the playback kept stalling.

I didn't have problem playing the same stream with theoplayer's demo page so I guess this was a quirk to hls.js.

[robwalch]

Not a Contribution

I assume that the server hadn't had complete segments ready yet when hls.js requested it because it took too much time between the browser request and server response for said segment

That would be a stream issue. HLS clients can only load segments listed in the HLS playlist, and the playlist should only list segments (EXT-INF) that are complete and ready to deliver.

I checked my browser's network requests and found out that hls.js was requesting large complete segments instead of smaller partial segments or chunks.

With HLS.js this could happen when playback is unable to keep up with the part list or when lowlatencyMode is disabled. Try reproducing the issue in the demo app, observing the Timeline and Buffer & Stats tabs. This sometimes helps to reveal playlist related playback issues.

If you are working with Low-Latency HLS streams please help by testing against #4825. The insight into roundtrip latency or TTFB (time to first byte) and the fixes in that PR may help explain why you are seeing stalls.

[robwalch]

Closing due to inactivity.