Quote from: fooball on 2024-02-10 11:02:32

Say I update a track because of a previously undiscovered bad rip or something.  Is there a better way to update the waveform cache than nuking it and rebuilding from scratch (which I just did, overnight)?

This ?

It's using a mono mix to generate the waveform.  If your artificial stereo signal is such that a mono mix (A/2 +B/2 ) results in silence, that's what will get saved as the waveform thumbnail.

If you need test signals of that nature, what you could do is temporarily remove one channel and submit the snapshot of that to the database.  Then restore the channel (without changing any of the file details).  So long as you don't then rebuild the thumbnail database, the waveform will be fetched from the database cache and not regenerated from the actual file.

I would think it's a waveform - music isn't just increases in sound pressure, but a wave with increases and decreases.

If it uses mono mix of the signal what do the upper and lower parts mean? It seems that they aren't just mirror images because sometimes I can see that ex. bottom spikes are different than the upper ones.

How does this component behave when multichannel files are being played - does it downmix all channels to mono or does it downmix just fronts and disregards all the others?

If it uses mono mix of the signal what do the upper and lower parts mean? It seems that they aren't just mirror images because sometimes I can see that ex. bottom spikes are different than the upper ones.

@Case, would it be possible to add an option to save waveforms as separate files in folders containing actual (measured) audio files and not in "central" databse?

// ==PREPROCESSOR==
// @name "Minimal Seekbar"
// @author "marc2003"
// @import "%fb2k_component_path%helpers.txt"
// @import "%fb2k_component_path%samples\js\lodash.min.js"
// @import "%fb2k_component_path%samples\js\common.js"
// @import "%fb2k_component_path%samples\js\seekbar.js"
// ==/PREPROCESSOR==

var seekbar = new _seekbar(0, 0, 0, 0);
var font = CreateFontString("Segoe UI", 12);
var is_dark = window.IsDark;

var tfo = {
	playback_time : fb.TitleFormat('[%playback_time%]'),
	length : fb.TitleFormat('$if2(%length%,LIVE)'),
};

var colours = {
	dark : RGB(30, 30, 30),
	light : RGB(240, 240, 240),
	slider_background : RGB(160, 160, 160),
	slider_contrast : RGB(196, 30, 35),
};

function on_colours_changed() {
	is_dark = window.IsDark;
	window.Repaint();
}

function on_mouse_lbtn_down(x, y) {
	seekbar.lbtn_down(x, y);
}

function on_mouse_lbtn_up(x, y) {
	seekbar.lbtn_up(x, y);
}

function on_mouse_move(x, y) {
	seekbar.move(x, y);
}

function on_mouse_wheel(s) {
	seekbar.wheel(s);
}

function on_paint(gr) {
	gr.Clear(is_dark ? colours.dark : colours.light);
	gr.FillRoundedRectangle(seekbar.x, seekbar.y, seekbar.w, seekbar.h, _scale(2), _scale(2), colours.slider_background);

	if (fb.IsPlaying) {
		var time_width = seekbar.x - _scale(12);
		gr.WriteText(tfo.playback_time.Eval(), font, is_dark ? colours.light : colours.dark, 0, 0, time_width, window.Height - 3, 1, 2);
		gr.WriteText(tfo.length.Eval(), font, is_dark ? colours.light : colours.dark, seekbar.x + seekbar.w + _scale(12), 0, time_width, window.Height - 3, 0, 2);

		if (fb.PlaybackLength > 0) {
			gr.FillEllipse(seekbar.x + seekbar.pos(), seekbar.y + _scale(3), _scale(6), _scale(6), colours.slider_contrast);
		}
	}
}

function on_playback_seek() {
	seekbar.playback_seek();
}

function on_playback_stop() {
	window.Repaint();
}

function on_playback_time() {
	window.Repaint();
}

function on_size() {
	seekbar.x = _scale(60);
	seekbar.y = (window.Height / 2) - _scale(3);
	seekbar.w = window.Width - (seekbar.x * 2);
	seekbar.h  = _scale(6);
}

// ==PREPROCESSOR==
// @name "Seekbar"
// @author "marc2003"
// @import "%fb2k_component_path%helpers.txt"
// @import "%fb2k_component_path%samples\js\lodash.min.js"
// @import "%fb2k_component_path%samples\js\common.js"
// @import "%fb2k_component_path%samples\js\seekbar.js"
// ==/PREPROCESSOR==

var seekbar = new _seekbar(0, 0, 0, 0);
seekbar.c1 = RGB(50, 50, 50);
seekbar.c2 = RGB(196, 30, 35);

function on_mouse_lbtn_down(x, y) {
	seekbar.lbtn_down(x, y);
}

function on_mouse_lbtn_up(x, y) {
	seekbar.lbtn_up(x, y);
}

function on_mouse_move(x, y) {
	seekbar.move(x, y);
}

function on_mouse_wheel(s) {
	seekbar.wheel(s);
}

function on_paint(gr) {
	gr.FillRectangle(seekbar.x, seekbar.y, seekbar.w, seekbar.h, seekbar.c1);
	if (fb.IsPlaying && fb.PlaybackLength > 0) {
		gr.FillRectangle(seekbar.x, seekbar.y, seekbar.pos(), seekbar.h, seekbar.c2);
	}
}

function on_playback_seek() {
	seekbar.playback_seek();
}

function on_playback_stop() {
	seekbar.playback_stop();
}

function on_size() {
	seekbar.w = window.Width;
	seekbar.h = window.Height;
}

function on_playback_time() {
	window.Repaint();
}

Hello!
Pausing doesn't update waveform minibar instantly, it updates similarly to the default seekbar (which is reasonable!)
JScript Panel "Minimal Seekbar" functions similarly, BUT as you can see, JScript Panel "Seekbar" updates instantly!
I'm not sure what magic it does to achieve that  but maybe it can be done for this component?

I have files downloaded with yt-dlp that originally are .webm with the only audio stream being A_OPUS audio. I've changed the extension of these files to .opus

Once I tried to import the files into foobar2000, the processing took over 15 minutes for files that have total size of 520 MB, and after they imported, foobar2000 absolutely halted and refused to function. After restart, shorter audio files can play with a bit of lag before playback, some longer files can playback without waveform showing anything, and even longer files (30 minutes or so) are freezing foobar2000 and eventually play in the background, but the app is frozen.

The wiggle you see that the bar moves backwards is a problem with timing information between the core and outputs. If you update to foobar2000 v2.2 previews it should be fixed.