known problems

streaming compression of uploads: optional arguments to volume-flag pk don't work, so you can only force-enable compression without specifying an exact algorithm (gz/xz) and level (0-9), instead letting the client choose a preference -- default is gz,9

new features

automatically enable transcoding for unsupported audio codecs (aac/m4a in some chromium builds)
audio-player: gapless albums are even closer to gapless now
- especially on iOS devices as they generally ignore preload hints
- on all other browsers, opus appears to perform better than other codecs (noice)
added a tooltip delay, and a hint next to the mouse-cursor for instant feedback
new button in the control-panel, enable k304 which kills the http connection on every 304 Not Modified response
- avoids a bug in some browsers (ie11) and webproxies (squid maybe?) which sometimes get stuck, expecting data after the header
enable up2k-registry serialization when running without -e2d / sqlite, so incomplete uploads can be resumed after a server restart
include both the hex and base64 sha512 representations in upload responses
standalone up2k upload client: option --ok ignores any inaccessible files/folders and starts the upload anyways
option --rsp-slp adds a synthetic delay to client responses

up2k-webclient: could crash if two browser-tabs uploaded the same chunk simultaneously
- mostly harmless but you'd have to reload the tab to fix it + manually resume the upload
buggy behavior when python was compiled without sqlite3 (default on freebsd)
- memory usage would grow infinitely as more files were uploaded
- exceptions sent to the client when trying to search
add timeouts to FFmpeg operations, preventing invalid files from eating the --th-mt threads
- 10 seconds for filetype / metadata parsing
- 60 seconds (--th-convt) for thumbnails and audio transcoding
up2k-webclient: fix an inconvenient priority inversion when turbo/yolo was enabled

replaced ogv.js with serverside rewrapping of opus files into the appropriate apple-proprietary container

sfx size is now 190 KiB smaller
feature-wise, this only affects iOS devices (iPhones, iPads, iPods)
no more opus decoding in javascript! now uses the native opus decoder instead
enables OS media controls since apple finally added mediaSession in iOS 15
- play/pause doesn't work too well, probably fixed in a future iOS version
- artist/title tags can suddenly become the filename (another iOS bug)
disables the in-browser volume control because apple demands it, can't be helped
disables support for ogg/vorbis, only opus is playable without transcoding
- vorbis is transcoded to opus automatically, but this causes a quality loss
audio-equalizer is broken for opus and all other 48khz audio files because apple made AudioContext hardcoded to 44100 hz
- makes the iPhone X buffer-overflow, all audio dies after ~2 minutes
- also ruins the common workaround for apple disabling volume controls
gets rid of the silly sinewave generator which tricked iOS into letting the tab continue playing in the background