torrentclaw/unarr
1
0
Fork 0
Code Issues Pull requests Projects Releases 4 Packages Wiki Activity Actions

feat(stream): bitrate-sized readahead for play-while-download

Browse source 
The torrent reader used a static 5 MiB readahead — about 1.9s of a 20 Mbps 4K
stream — so streaming a torrent while it downloaded outran the download and
stalled. anacrolix's reader already prioritises the pieces in the readahead
window ahead of the playhead (and re-prioritises on seek); the window was just
too small. dynamicReadahead sizes it to ~30s of video (clamped 8-96 MiB, 24 MiB
default when bitrate is unknown). The torrent provider probes the bitrate
asynchronously so stream start never blocks on ffprobe; readers created after
the probe resolves pick up the accurate size. Real 4K (20.7 Mbps) -> 73 MiB.
This commit is contained in:
Deivid Soto 2026-05-31 23:23:39 +02:00
parent e4373454ba
commit 9c995fc4dd
6 changed files with 110 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

5
internal/engine/torrent.go
View file

@ -642,7 +642,10 @@ func (d *TorrentDownloader) GetStreamProvider(taskID string) (FileProvider, erro
return nil, fmt.Errorf("torrent has no files")
}
return NewTorrentFileProvider(video), nil
// The provider probes the bitrate asynchronously (to size the streaming
// readahead) — passing DataDir lets it locate the on-disk file without
// blocking stream start.
return NewTorrentFileProvider(video, d.cfg.DataDir), nil
}
// VideoExts is the canonical set of video file extensions used for file selection.