When a fallback provider returns a non-FLAC container (e.g. YouTube Opus) and neither an explicit extension field nor a recognizable path suffix is available (such as SAF content URIs), infer the output extension from the backend-probed audio codec. Prevents Opus/MP3/AAC downloads from being mislabeled and embedded as FLAC, which left metadata empty.
Add a playlist position token usable in filename templates, plumbed from the playlist screen through the download queue to the Go backend. Auto-prefix playlist downloads with the position when the template lacks the token. Includes Go filename test.
Classify verification-required and rate-limit errors from extensions, propagate Retry-After seconds through the download fallback, report session-grant success/failure, and add a completeGrant action fallback in the runtime.
Resolve artist taps by id when available and fall back to name-similarity matching instead of blindly picking the first search result. Pass provider id at more call sites and map multiple artist ids positionally to their names.
Decrypt AC-4 via the FFmpeg mov muxer with a -f mov fallback, then repair the output to a standards-compliant ISO MP4: inject the dac4 config box from the encrypted source, normalize the QuickTime container/sample entry, and write iTunes metadata (incl. cover and lyrics) natively. Codec-keyed and generic, so it applies to any extension that returns AC-4 streams. Wired through PlatformBridge/MainActivity for both SAF and local decrypt paths.
Re-encode/downscale cover art that exceeds the FLAC 24-bit picture block limit (go-flac silently truncated it into a corrupt file). Locate ilst in both ISO and QuickTime-style meta atoms, and skip freeform tags gracefully when no iTunes container exists.
Write R128_TRACK_GAIN/R128_ALBUM_GAIN (Q7.8, ref -23 LUFS) alongside the existing REPLAYGAIN_* tags for .opus files so spec-compliant Opus players (RFC 7845) apply gain. Covers per-track and album embed during download (incl. SAF) and standalone re-scan.
The GL renderer string is empty when Flutter shell args are built (no GL context yet), so the GPU-pattern check never matched Sony Walkman devices and Impeller crashed in the Vivante driver's glLinkProgram. Match MANUFACTURER 'SonyAudio' (distinct from Xperia 'Sony') and add Vivante GC GPU patterns.
FFmpeg's MP4 muxer drops ISRC and label, so write them as iTunes freeform atoms natively after every M4A embed pass. The metadata screen now reads all edited fields from the file on load (file is the source of truth), fixing edited values reverting to stale cached values after reopening.
The ffmpeg_kit_flutter_new_full pub package ships setup_ios.sh with CRLF line endings, so its podspec prepare_command failed with '/bin/bash^M: bad interpreter'. Normalize the plugin's shell scripts in the pub cache before building iOS.
zarzet