I have a Python3 script that responds to input from a rotary dial phone (via GPIO pins on a raspberry pi.) If I dial a 1, my script uses subprocess to tell mpg123 to play a file called 1.mp3. 2 plays 2.mp3, and so on up to 7. This is working:
filename = "/media/"+str(number)+".mp3"
player = subprocess.Popen(["mpg123", filename, "-q"], stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
If I dial 8, the magic 8-ball, the script should behave differently. I want it to call mpg123 with the "little shuffle" flag, -z. From the command line, I know how to make that call:
mpg123 -z /media/mp3s/*
I want to use this exact syntax in my python3 script, but it isn't working.
if number ===8:
player = subprocess.Popen(["mpg123", "-z", "/media/mp3s/*"], stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
Nothing happens. Script just waits patiently for the next non-8 input.
As a Plan B, I thought maybe I could pass a list of files to mpg123 with glob.glob:
filelist = glob.glob('/media/mp3s/*.mp3')
print(filelist)
player = subprocess.Popen(["mpg123", "-z", "--list", filelist], stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
This crashes the script because TypeError: Can't convert 'list' object to str implicitly (Though it does successfully print out the list of files before it dies.) I think I must be very close with at least one approach, but I can't figure out the last little bit of syntax. Any ideas appreciated.**
Alright - I figured out a way to make it work, using mpg123's builtin directory specifying flag, -B. I am still curious about how to get one or both of my other approaches to work. For the record, this works:
player = subprocess.Popen(["mpg123", "-Bz", "/media/mp3s/"],.......
Your solution is probably better, however I thought I would point out the problem with your plan B:
filelist = glob.glob('/media/mp3s/*.mp3')
print(filelist)
player = subprocess.Popen(["mpg123", "-z", "--list", filelist], stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
The problem here is you are passing filelist as an item to the list. So you would get a list containing a list:
["mpg123", "-z", "--list", [ '/media/mp3s/1.mp3', '/media/mp3s/2.mp3' ]]
However what you wanted is this:
["mpg123", "-z", "--list", '/media/mp3s/1.mp3', '/media/mp3s/2.mp3']
To get these you need to join the lists together:
player = subprocess.Popen(["mpg123", "-z", "--list"] + filelist, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
Not tested, but I believe this should work.