Hi,
2013/3/23 Kevin McQuiggin <mcqui...@sfu.ca>:
> I have done further research into the behaviour of merge_tracks() and
> switch(). Either I don't understand the correct behaviour of these
> constructs, or I have found a bug. Demo code is attached and documented
> herein. I have tried to document the issue clearly, and provided source
> code. I hope this will help with resolution of my problem!
>
>
> BACKGROUND:
>
> I want to use a switch() construct to play an -entire- playlist in normal
> (i.e. top to bottom) order at a specified time. I am using merge_tracks() to
> join the target playlist into a single track.
>
>
> PLATFORM:
>
> Liquidsoap 1.1.0 running on an Intel machine; Ubuntu 12.10 with all updates
> applied.
>
>
> PLAYLIST:
>
> I have the following playlist, named "test.pls", which consists of 4 short
> .ogg files. Each .ogg file is a 2-second long item that just contains the
> spoken audio "Item A", "Item B", "Item C", and "Item D". The merged audio
> file will be only about 8 seconds in length. Here is the playlist file:
>
> $ cat ../playlists/test.pls
> /home/kevin/radio/content/test/a.ogg
> /home/kevin/radio/content/test/b.ogg
> /home/kevin/radio/content/test/c.ogg
> /home/kevin/radio/content/test/d.ogg
>
>
> PROGRAM CODE:
>
> I have written a short test program to play the merged "test.pls" source
> twice per minute. Here is my short test program:
>
> $ cat demo.liq
> #!/usr/local/bin/liquidsoap
>
> # Logging information:
> set("log.file.path","/home/kevin/radio/log/test.log")
>
> # Test: merge tracks of test.pls:
> zzz = merge_tracks(playlist.safe(reload_mode="watch", mode="normal",
> "~/radio/playlists/test.pls"))
>
> radio = mksafe(fallback(track_sensitive=false, [
> switch([
> ({0s}, zzz),
> ({30s}, zzz)
> ])
> ]
> ))
>
> # Streaming:
> output.icecast(%vorbis,
> host = "localhost", port = 8000,
> password = "donthackme", mount = "vorbis-dev",
> radio)
>
> output.icecast(
> %mp3(bitrate=128),
> host = "localhost", port = 8000,
> password = "donthackme", mount = "mp3-dev",
> radio)
>
>
> EXPECTED BEHAVIOUR:
>
> I expected that the program would play the entire "test.pls" (items a, b, c,
> and d.ogg) twice every minute, at 0 seconds and 30 seconds of every minute. I
> should hear "Item A, Item B, Item C, Item D" for about 8 seconds, starting at
> 0 seconds; and then again at 30 seconds past each minute.
>
>
> OBSERVED BEHAVIOUR:
>
> The program plays only 2 items, "a.ogg" and "b.ogg" at 0 seconds of the
> minute; then it plays the other two items, "c.ogg" and "d.ogg" at 30 seconds
> past the minute. This behaviour continues each minute.
>
>
> SUMMARY:
>
> Either I don't understand the LS constructs, or there is a problem either
> with merge_tracks() or with switch().
>
> I am hoping for the former, as I would like to get my little project
> completed, but if this is a bug then I hope this information can help resolve
> it.
>
> I have attached my demo program code.
>
> Any assistance appreciated, I like LS so far and it will meet my project
> needs perfectly once I get the new program running!
Thank you very much for your work on narrowing this down! I will try
to reproduce very soon. In the mean time, I have the same question:
could you show some logs?
Thanks!
Romain
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