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fix(stream): no copiar AAC multicanal en modo copy (WebKit lo rechaza igual)

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El downmix estéreo del re-encode (f89396c) dejaba un agujero simétrico: una
fuente cuyo audio YA es AAC 5.1 se copiaba tal cual, y WebKit rechaza el
AAC multicanal en el primer segmento exactamente igual que el re-encodeado.
Copy de audio ahora solo cuando la pista es AAC con ≤2 canales; cualquier
otra cosa (no-AAC, AAC 5.1+, o canales desconocidos en el probe — fail-safe)
re-encodea a AAC estéreo 48k. La pista multicanal original queda intacta
para reproductor externo. Test smoke nuevo: fuente AAC 5.1 → re-encode.
This commit is contained in:
Deivid Soto 2026-06-11 00:05:50 +02:00
parent f89396ceed
commit a4a6e2f2d6
2 changed files with 29 additions and 8 deletions
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18
internal/engine/hls.go
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@ -1959,20 +1959,22 @@ func buildHLSCopyArgs(cfg HLSSessionConfig, probe *StreamProbe, tmpDir string) [
args = append(args, "-tag:v", "hvc1")
}
// Audio: copy when the SELECTED track is already AAC, else AAC 192k.
// (fMP4 HLS carries AAC universally; EAC3/DTS/TrueHD do not.)
// Audio: copy ONLY when the selected track is AAC with ≤2 channels —
// WebKit/Apple HLS rejects multichannel AAC at the first media segment
// (observed via the Safari access log: master → index → init → seg-0
// fetched twice, then silence — every 5.1 movie failed on iPhone while
// stereo-AAC episodes played). Anything else (non-AAC, or AAC 5.1+) is
// re-encoded mirroring the encode path exactly: AAC stereo 48k. The
// original multichannel track stays intact for external players.
audioCodec := probe.AudioCodec
audioChannels := 0
if audioIdx < len(probe.AudioTracks) {
audioCodec = probe.AudioTracks[audioIdx].Codec
audioChannels = probe.AudioTracks[audioIdx].Channels
}
if strings.EqualFold(audioCodec, "aac") {
if strings.EqualFold(audioCodec, "aac") && audioChannels > 0 && audioChannels <= 2 {
args = append(args, "-c:a", "copy")
} else {
// Mirror the encode path exactly: AAC stereo 48k. WITHOUT -ac 2 a 5.1
// source produces 6-channel ffmpeg-native AAC, which WebKit/Apple HLS
// rejects at the first media segment (observed via Safari access log:
// master → index → init → seg-0 fetched twice, then silence — every
// 5.1 movie failed on iPhone while stereo-AAC episodes played).
args = append(args, "-c:a", "aac", "-b:a", "192k", "-ar", "48000", "-ac", "2")
}