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feat(stream): burn bitmap (PGS/DVB) subtitles into the video via overlay

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Bitmap subs can't be served as WebVTT, so the user picks one and the daemon
re-encodes with it overlaid. HLSSessionConfig.BurnSubtitleIndex (*int, nil=no
burn) flows into the cache key + a -filter_complex graph:
  [0✌️0]<vchain>[base];[0:s:N][base]scale2ref[sub][base2];[base2][sub]overlay[vout]
Overlay after the tonemap (SDR subs keep brightness); scale2ref fits the PGS
canvas to the output. Invalid/text/out-of-range index -> clean-encode fallback.
IsTextSubtitle now includes "text" (parity with the web classifier).
This commit is contained in:
Deivid Soto 2026-06-01 09:51:27 +02:00
parent 8207d1d2a9
commit 665ec0a34f
9 changed files with 196 additions and 49 deletions
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13
internal/engine/hls_cache_test.go
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@ -21,18 +21,21 @@ func newTestCache(t *testing.T, sizeGB int) *HLSCache {
func TestKeyForStable(t *testing.T) {
c := newTestCache(t, 1)
k1 := c.KeyFor("/a/b/movie.mkv", "1080p", 0)
k2 := c.KeyFor("/a/b/movie.mkv", "1080p", 0)
k1 := c.KeyFor("/a/b/movie.mkv", "1080p", 0, -1)
k2 := c.KeyFor("/a/b/movie.mkv", "1080p", 0, -1)
if k1 != k2 {
t.Fatalf("expected stable keys, got %q vs %q", k1, k2)
}
if c.KeyFor("/a/b/movie.mkv", "720p", 0) == k1 {
if c.KeyFor("/a/b/movie.mkv", "720p", 0, -1) == k1 {
t.Fatal("quality should change key")
}
if c.KeyFor("/a/b/movie.mkv", "1080p", 1) == k1 {
if c.KeyFor("/a/b/movie.mkv", "1080p", 1, -1) == k1 {
t.Fatal("audio index should change key")
}
if c.KeyFor("/x/y/other.mkv", "1080p", 0) == k1 {
if c.KeyFor("/a/b/movie.mkv", "1080p", 0, 2) == k1 {
t.Fatal("burn subtitle index should change key")
}
if c.KeyFor("/x/y/other.mkv", "1080p", 0, -1) == k1 {
t.Fatal("path should change key")
}
}