Input-side fast seek (-ss before -i) requires the HTTP server to support
Range/keyframe seeking. NetEase's CDN (music.126.net signed streams) doesn't,
so dragging the progress bar hung FFmpeg and the player force-killed it
(SIGKILL) with no audio. Moving -ss after -i decodes from the start and
discards to the target, which works on any HTTP stream; FFmpeg still fast-seeks
when the CDN supports it, so QQ keeps its instant resume.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
In Random/RandomLoop modes, prev now records the current position
to a forwardStack, and next pops from it first. This ensures prev→next
navigation is fully reversible for any number of steps (up to 50).
Also rebuild playedIndices in prev() so songs reached via backward
navigation become available for random selection again.
