The len() of class av.audio.frame.AudioFrame

[LuoXishuang0712]

The problem

I create a new Anaconda environment with python3.7, and install the dependencies following the guidance. But as pipwin has the SSL problem, I install the pyaudio by conda rather than the pipwin in the guidance. And run this to start the service:

python .\ap2-receiver.py -m "myap2" -n "{C7454699-5CBC-436B-9279-71EE595128A0}"

Before the client start playing, everything is fine. But once audio streaming start, this exception is raised:

[AudioRealtime]: TypeError("object of type 'av.audio.frame.AudioFrame' has no len()")

And I try to locate it, the detail of the exception is:

Exception in thread Thread-2:
Traceback (most recent call last):
  File "C:\Users\hra20\Anaconda3\envs\airplay\lib\threading.py", line 926, in _bootstrap_inner
    self.run()
  File "C:\Users\hra20\Anaconda3\envs\airplay\lib\threading.py", line 870, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Users\hra20\Downloads\airplay2-receiver-master\ap2\connections\audio.py", line 795, in play
    raise e
  File "C:\Users\hra20\Downloads\airplay2-receiver-master\ap2\connections\audio.py", line 777, in play
    audio = self.process(rtp)
  File "C:\Users\hra20\Downloads\airplay2-receiver-master\ap2\connections\audio.py", line 572, in process
    if len(frame) == 1:  # if no resampling was needed, resample returns [frame]
TypeError: object of type 'av.audio.frame.AudioFrame' has no len()

I view the latest commit of ap2/connections/audio.py and find a new commit(2af912c) just to change the line 572-574, and I simply comment these lines below:

572 | if len(frame) == 1:  # if no resampling was needed, resample returns [frame]
573 |     frame = frame[0]

and it works. Maybe it is just not working propery on Windows.

What commit exhibits the issue?

07195c5

Was there a last known working commit?

6f3c1ce

What type of installation are you running?

virtualenv

With which python3 version do you run Receiver?

Python 3.7.15

OS the receiver runs on

Windows 11 21H2(22000.1455)

OS the sender runs

iPadOS 15.5

Which sender client was used

NetEase Cloud Music

Command invocation

python .\ap2-receiver.py -m "myap2" -n "{C7454699-5CBC-436B-9279-71EE595128A0}"

Please include --debug output which helps to illustrate the problem

log.txt This log is from the original project codes.

Additional information

No response

[MrTweaks]

I think you also need to comment out the third line (#574)

[LuoXishuang0712]

Here are all three lines in audio.py:

 572 | if len(frame) == 1:  # if no resampling was needed, resample returns [frame]
 573 |     frame = frame[0]
 574 | return bytes(frame.planes[0])

[MrTweaks]

Yes, commenting these 3 out worked for me (I had the same error) Unfortunately, I've got another issue - All seems to be working, but there is no audio output. Unfortunately - since all SEEMS to be working OK - there is no default logging, or usuable debugging output. I suspect it has something to do with PyAudio...

[systemcrash]

If you remove the return statement, which passes the (ffmpeg) decoded frame data, you'll hear nothing :)

[RMXCRW]

If you remove the return statement, which passes the (ffmpeg) decoded frame data, you'll hear nothing :)

Thanks, this obviously worked...

[systemcrash]

You might do well to try the latest commit, and see whether it really fixes your issue