Creating fixed length files

[jleren]

Hi,

Im trying to create fixed length files, for example 60 minutes, of mixed together music.

It needs to be a specific duration, to fit into a schedule.

My initial try was to use annotate to set cue points, where the last track would be cut short, to match the specified duration, but due to crossfade and other aspects, its very hard to precisely get the stream to end at eg 60 minutes.

Is there another way to accomplish this? My next idea would be a function, that makes the source fade out at exactly 59:59, for one second, and then end, but im not sure how to accomplish this.

This is my currently very simple script,

mainsource =
  amplify(
    1., override="track_gain", cue_cut(playlist(loop=false, "83_600_660.pls"))
  )

mainplayable =
  once(crossfade(fade_in=1., fade_out=1., duration=1., smart=false, mainsource))

clock.assign_new(sync="none", [mainplayable])

output.file(
  %mp3(bitrate = 128, samplerate = 44100, stereo = true, id3v2 = true),
  "83_600_660.mp3",
  fallible=true,
  on_stop=shutdown,
  mainplayable
)