Waveform gaps with long audio at a high zoom

[katspaugh]

A known regression in 7.8.0, reported here: #3696 (comment)

The new virtualized rendering leaves gaps in some edge cases.

[larsrgit]

Sadly I can't share the audio, as it contains sensitive personal information.

One more thing I noticed: It also depends on where in the audio I zoom, not only the audio length. The audio I tested with is 62:01min long. When I zoom into any point before a specific point (dependend on the container size, the smaller the container, the later in the audio) it shows the waveform, after this point the waveform does not render if I zoom further than ~1500pxPerSec (independent of container size the same pxPerSec).

More information that could be relevant. I zoom into regions using the following code:

// change zoom and view to the uttterance
this.utteranceWs.zoom(this.waveSurferContainer.nativeElement.clientWidth/(this.endTimeSec - this.startTimeSec))
// set time first to zero to assure that autoscroll sets the curser to the middle of the view when setting the curser to the middle of the utterance
this.utteranceWs.setTime(0)
this.utteranceWs.setTime(this.startTimeSec + (this.endTimeSec - this.startTimeSec) / 2)
// disable autoscroll
this.utteranceWs.setOptions({autoScroll:false})
// set time to beginning of utterance
this.utteranceWs.setTime(this.startTimeSec)

[katspaugh]

Ah I actually haven’t tried with programmatic time/zoom setting, I always tested with manual scrolling. Thanks!