MP3 export for mobile listening: automatic, on-demand, or both?

[palavido-dev]

Right now, recordings live on the Pi as lossless FLAC files and are only playable through the Vinyl Streamer UI. That is great for home listening, but what about when you want your vinyl collection in the car, on a run, or anywhere else?

Exposing the player publicly over the internet is technically possible but opens up a can of worms around authentication, VPN setup, SSL certificates, and general security hardening that most people probably do not want to deal with for a hobby project.

A simpler approach: MP3 export. Convert your recordings to portable MP3 files you can drop into Apple Music, iTunes, or any other player.

Some open questions worth discussing:

When should conversion happen?

• Automatically after every recording finishes (generates MP3 alongside the FLAC)
• On demand (you pick an album or track and hit an export button)
• A toggle in Settings so you can choose your preference
• Automatic conversion would use more storage and CPU time on the Pi, but your exports would always be ready to go. On-demand keeps things lean but adds a wait when you want to grab something.

What quality settings?

• Fixed at something like 320kbps CBR for simplicity?
• User-configurable bitrate (128/192/256/320)?
• VBR as an option for better quality-to-size ratio?

How do you actually get the files off the Pi?

• Downloading tracks one at a time through the browser would be tedious for a full library.
• A zip download per album with a clean folder structure (Artist/Album/01 - Track.mp3) seems more practical.
• Full library export as a single zip?
• Maybe a "sync" folder on the Pi that you can access over your local network (SMB/NFS share) so your computer can pull files directly?

Metadata and organization:

• MP3 tags (ID3) should carry over artist, album, track title, track number, and album art from the catalog.
• Folder structure matters for programs that scan directories. Something like Artist/Album/01 - Track Title.mp3 is what most players expect.

Anything else?

• Would other formats be useful? AAC/M4A for better Apple compatibility, OGG for open-source folks?
• Should there be a way to export just a playlist rather than full albums?
• Any interest in automatic sync to a cloud folder (Dropbox, Google Drive, etc.) so exports show up on your phone without manual transfers?

Would love to hear how people would actually use this and what matters most. Drop your thoughts below!

[skoregon]

Certainly it would be nice to be able to export at a lower quality than FLAC such as AAC with a user selectable bit rate.

[palavido-dev]

Quick update on this thread since it's been a few months. The export feature shipped, and it covers most of what we discussed above.

What landed:

• Two output formats: M4A (AAC) and MP3. AAC at 256 kbps (Apple Music's quality target) and MP3 at 320 kbps via libmp3lame. @skoregon, your ask for AAC export went in as the M4A path. I kept the bitrate fixed per format rather than exposing a dropdown, just to keep the Settings UI simple. Easy to add a bitrate selector if anyone actually wants 128/192 for storage reasons; just say the word.
• On-demand, per album. Hit Export on an album in the UI and it splits the per-side FLAC into per-track files, embeds metadata and cover art, and writes them under Artist/Album (Year)/01 - Track.ext so iTunes, Apple Music, Plex, etc. all scan correctly. No auto-export on every recording. The CPU hit isn't huge, but writing AAC for every record you capture felt wasteful when most of mine never need to leave the Pi.
• Three ways to get the files off the Pi:
  1. Samba share. The installer now sets up \\<pi>\exports as an SMB share, so you can browse the export folder from any computer on your network and drag album folders straight into iTunes or wherever.
  2. HTTP download. Each exported track has a direct download URL, and entire albums can be downloaded as a single zip from the album detail modal.
  3. Library export (separate but related). One-click download of the full catalog database and a JSON manifest of your library, for backup or pairing with an rsync script if you want to mirror your full FLAC library somewhere.
• Export badges in the UI. Albums that have been exported show a badge in the grid so you can tell at a glance what's already converted. Re-exports skip files that already exist unless you force re-export, so you can re-run an album without paying the encode cost twice.

What I did not ship and is still open:

• Automatic export on record-completion. Skipped for now. Probably the right shape is a Settings toggle defaulting to off; I think most people want this opt-in.
• Playlists / partial-album export. Skipped. Curious whether anyone actually wants this; I haven't missed it personally.
• Cloud sync (Dropbox, Drive, etc.). Out of scope for v1 to keep the surface small. The Samba share plus rsync covers most of what cloud sync gives you for free.
• Bitrate selector. Kept fixed per format. Easy add if anyone wants it.

If anyone here has actually used the export workflow and has feedback on what works, what's missing, or what's broken, drop it below. Otherwise I'll let this thread settle.