89026012ab
The FLAC muxer writes STREAMINFO before it knows the stream length, then rewinds at the end to fill total_samples in. Navidrome pipes ffmpeg's stdout (-f flac -), which is not seekable, so ffmpeg logs "unable to rewrite FLAC header" and the field stays 0. A decoder needs total_samples to turn a timestamp into a byte offset, so it reports an unknown duration and refuses to seek. Online playback hides this because the client re-requests with a new offset each time, but an offline copy is permanently unseekable, the symptom reported against Symfonium where seeking a downloaded track jumps back to the start. Transcode now wraps its own output and rewrites total_samples as the first bytes flow past. This lives in core/ffmpeg because the unseekable pipe is that package's doing: buildDynamicArgs is what appends the trailing '-'. core/stream only learns a target format and hands back an io.ReadCloser, so compensating there leaked a transcoder implementation detail one layer up. TranscodeOptions grows a Duration field alongside the existing Offset, which also puts the duration-minus-offset arithmetic in the same function that emits -ss. The wrapper runs on every transcode rather than only FLAC targets: the format on a transcoding row is a declared target that nothing validates against the command's actual -f, so a custom command can emit FLAC under any target_format. The magic-byte check inside the wrapper is the authoritative test and costs a 26-byte peek. The output sample rate is read back out of the header ffmpeg just wrote rather than taken from the transcode options, so a resampled (-ar) output still gets the right count. Anything that is not a FLAC stream with an unset total_samples passes through byte for byte. Measured on a 177s source: before, total_samples=0 and ffprobe reported duration N/A; after, total_samples=7807023 and duration 177.03s, with the audio payload byte-identical. This affects every piped FLAC regardless of the source format; only FLAC stores an authoritative "unknown", which is why mp3, opus and aac survive the same pipe. No SEEKTABLE is synthesised and the MD5 is left zero: both are optional, and decoders binary-search using total_samples alone.
Navidrome Music Server 
Navidrome is an open source web-based music collection server and streamer. It gives you freedom to listen to your music collection from any browser or mobile device. It's like your personal Spotify!
Note: The master branch may be in an unstable or even broken state during development.
Please use releases instead of
the master branch in order to get a stable set of binaries.
Check out our Live Demo!
Any feedback is welcome! If you need/want a new feature, find a bug or think of any way to improve Navidrome, please file a GitHub issue or join the discussion in our Subreddit. If you want to contribute to the project in any other way (ui/backend dev, translations, themes), please join the chat in our Discord server.
Installation
See instructions on the project's website
Cloud Hosting
PikaPods has partnered with us to offer you an officially supported, cloud-hosted solution. A share of the revenue helps fund the development of Navidrome at no additional cost for you.
Features
- Handles very large music collections
- Streams virtually any audio format available
- Reads and uses all your beautifully curated metadata
- Great support for compilations (Various Artists albums) and box sets (multi-disc albums)
- Multi-user, each user has their own play counts, playlists, favourites, etc...
- Very low resource usage
- Multi-platform, runs on macOS, Linux and Windows. Docker images are also provided
- Ready to use binaries for all major platforms, including Raspberry Pi
- Automatically monitors your library for changes, importing new files and reloading new metadata
- Supports lyrics from sidecar .ttml, .yaml/.yml Lyricsfile, .elrc, .lrc, .srt, .txt files and embedded TTML, Enhanced LRC, LRC, SRT, and plain-text tags (via
lyricspriority) - Themeable, modern and responsive Web interface based on Material UI
- Compatible with all Subsonic/Madsonic/Airsonic clients
- Transcoding on the fly. Can be set per user/player. Opus encoding is supported
- Translated to various languages
Translations
Navidrome uses POEditor for translations, and we are always looking for more contributors
Documentation
All documentation can be found in the project's website: https://www.navidrome.org/docs. Here are some useful direct links:
Screenshots
