The first fix (#895) only caught manifests that HONESTLY declared a short length. The
real-world fakes are nastier: every length header is faked to FULL — HLS #EXTINF, the
m4a moov, AND the demuxed FLAC's STREAMINFO total_samples — while the file holds only
~30s of real audio. So the manifest-sum and mutagen-length checks both read 'full' and
passed it through. Measured 23 issue files: every one decoded to ~30s with a claimed
full length; size/claimed gave an impossible 55-362 kbps 'lossless', size/30s gave a
plausible ~600-1100 kbps.
Detect it two independent ways (post-download), so it fires even when every header lies:
- decoded real length via ffmpeg (-f null) vs the largest claimed length — the ground
truth when a decoder is present (production demuxes with ffmpeg, so it is);
- for lossless, an impossibly-low implied bitrate (< 30% of raw PCM) — needs no decoder,
catches all 23 on its own.
Pure is_fake_lossless_bitrate / is_preview_download / parse_ffmpeg_time helpers with seam
tests pinned to the real #895 file numbers. Reference is max(expected, container-claimed)
so the file's own faked claim becomes the bar its real audio must clear.
Fixes#895 — https://github.com/Nezreka/SoulSync/issues/895
HiFi (Tidal via hifi-api) sometimes serves a PREVIEW HLS manifest — only ~30s of
segments — for a full-length track. SoulSync downloaded exactly what the manifest
contained, and the only validation was a 100KB size floor (a 30s lossless preview is
~3-4MB, so it passed as 'complete') → a junk file that shows full length but plays ~30s.
Add two duration guards, both keyed off the track's real length (from get_track_info):
- Pre-download: sum the manifest's #EXTINF segment durations; if far short of the
expected track length, it's a preview → skip that tier, fall through to the next
source without wasting the download. (The parser discarded #EXTINF before.)
- Post-download: probe the finished file's real length (mutagen) and reject if short —
backs up legacy/direct (no-EXTINF) downloads and catches any truncation.
Conservative: unknown/zero durations never reject. Pure sum_hls_segment_seconds /
is_short_audio helpers with seam tests.
