Script keeps throwing an error at line 16.

[RichardMarell]

Hello community, noob here. I generated the following script to play 4 radio streams. I want the streams to randomly select songs but without the risk of the same song being played twice in a row or too close together. This script keeps throwing errors and i am hoping someone can have a quick look at it. What am I doing wrong?:

# Allow running as root (not recommended for production)
set("init.allow_root", true)

# Function to get all files from a folder and shuffle them
def get_shuffled_playlist(folder)
  files = list.h.get_directory_contents(folder)
  files = list.filter(files, fun (f) -> string.endswith(f, ".mp3"))
  random.shuffle(files)
  files
end

# Function to play the next track from the shuffled playlist
def next_track(shuffled_playlist)
  if (list.length(!shuffled_playlist) == 0)
    shuffled_playlist := get_shuffled_playlist(folder)
  end
  track = list.hd(!shuffled_playlist)
  shuffled_playlist := list.tl(!shuffled_playlist)
  request.create(track)
end

# Load the playlists and shuffle them
ztracks1_folder = "/opt/marell/zradio/tracks1/"
ztracks1_shuffled = ref(get_shuffled_playlist(ztracks1_folder))

ztracks2_folder = "/opt/marell/zradio/tracks2/"
ztracks2_shuffled = ref(get_shuffled_playlist(ztracks2_folder))

ztracks3_folder = "/opt/marell/zradio/tracks3/"
ztracks3_shuffled = ref(get_shuffled_playlist(ztracks3_folder))

ztracks4_folder = "/opt/marell/zradio/tracks4/"
ztracks4_shuffled = ref(get_shuffled_playlist(ztracks4_folder))

# Create dynamic sources for each playlist
ztracks1 = request.dynamic(id="dynamic_ztracks1", fun () -> next_track(ztracks1_shuffled))
ztracks2 = request.dynamic(id="dynamic_ztracks2", fun () -> next_track(ztracks2_shuffled))
ztracks3 = request.dynamic(id="dynamic_ztracks3", fun () -> next_track(ztracks3_shuffled))
ztracks4 = request.dynamic(id="dynamic_ztracks4", fun () -> next_track(ztracks4_shuffled))

# Apply crossfade
ztracks1 = crossfade(smart=true, ztracks1)
ztracks2 = crossfade(smart=true, ztracks2)
ztracks3 = crossfade(smart=true, ztracks3)
ztracks4 = crossfade(smart=true, ztracks4)

# Make the sources safe
ztracks1_safe = mksafe(ztracks1)
ztracks2_safe = mksafe(ztracks2)
ztracks3_safe = mksafe(ztracks3)
ztracks4_safe = mksafe(ztracks4)


# Output the streams to Icecast servers
...... (Removed because of credentials. But this part works.)

[gAlleb]

Hi, @RichardMarell.

How about

ztracks1 = playlist("/opt/marell/zradio/tracks1/")
ztracks1 = crossfade(smart=true, ztracks1)
ztracks1 = mksafe(ztracks1)
output...

Your playlist will be randomized by default. No songs will be repeated by default. Please look https://www.liquidsoap.info/book/book.pdf Page 82.
Or am I missing something in the logic?

[RichardMarell]

Well, that is exactly what I have now execpt that I have it like this: ztracks1 = playlist("/opt/marell/zradio/tracks1/", mode="random"). And now the same song definately repeats itself sometimes. Is this because of "mode="random"? Should I omit random?

[gAlleb]

Yes.

Please look https://www.liquidsoap.info/book/book.pdf Page 82.

• "normal": play files in the order indicated in the playlist,
• "randomize": play files in a random order chosen for the whole playlist at
each round (default mode),
• "random": pick a random file each time in the playlist (there could thus be
repetitions in files)

 ztracks1 = playlist("/opt/marell/zradio/tracks1/", mode="randomize")

[RichardMarell]

Fantastic! Thank you. It had to be something as basic as this. Nobody wants to play the same song twice in a row.