Implement Low-Latency HLS

[aler9]

Fixes #556

Fixes #641

[codecov-commenter]

Codecov Report

Merging #938 (0c51737) into main (2efe19a) will decrease coverage by 14.20%.
The diff coverage is 17.68%.

@@             Coverage Diff             @@
##             main     #938       +/-   ##
===========================================
- Coverage   70.68%   56.47%   -14.21%     
===========================================
  Files          47       56        +9     
  Lines        5253     6693     +1440     
===========================================
+ Hits         3713     3780       +67     
- Misses       1283     2651     +1368     
- Partials      257      262        +5     

Impacted Files	Coverage Δ
internal/conf/hlsvariant.go	0.00% <0.00%> (ø)
internal/hls/mp4writer.go	0.00% <0.00%> (ø)
internal/hls/muxer_variant_fmp4.go	0.00% <0.00%> (ø)
internal/hls/muxer_variant_fmp4_part.go	0.00% <0.00%> (ø)
internal/hls/muxer_variant_fmp4_playlist.go	0.00% <0.00%> (ø)
internal/hls/muxer_variant_fmp4_segment.go	0.00% <0.00%> (ø)
internal/hls/muxer_variant_fmp4_segmenter.go	0.00% <0.00%> (ø)
internal/hls/muxer_variant_fmp4_init.go	1.03% <1.03%> (ø)
internal/hls/muxer.go	53.48% <47.36%> (-46.52%)	⬇️
internal/core/hls_muxer.go	75.98% <47.50%> (-0.62%)	⬇️
... and 9 more

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[JIEgOKOJI]

lhls muxer generates very small part segments
#EXTINF:1.999999968,
seg3.mp4
#EXT-X-PART:DURATION=0.020833333,URI="part388.mp4",INDEPENDENT=YES
apple not recomended segments smaller than 200ms, playback is unstable and corrupted even in hls.js

[aler9]

lhls muxer generates very small part segments #EXTINF:1.999999968, seg3.mp4 #EXT-X-PART:DURATION=0.020833333,URI="part388.mp4",INDEPENDENT=YES apple not recomended segments smaller than 200ms, playback is unstable and corrupted even in hls.js

i've added the option hlsPartDuration that allows to tune the part duration.

Anyway during my tests i've been able to generate and use (with hls.js) parts that contained a single video / audio frame, that is the minimum quantity at all.

[JIEgOKOJI]

now it works great. Also found that if stream has no b-frames lhls will never playback in hls.js

[hhackbarth]

Great to see that LL-HLS is on the way. I would be happy to participate in the test as well. Can you provide a Windows build for this branch?

[aler9]

added in v0.19.0 🎉

[github-actions]

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