[HELP] playing raw PCM audio

[biGdada]

hi.
can this plugin play raw PCM audio (16 bit little endian, 44100, stereo)?

ffmpeg from command line can read this file with the following parameters:
/usr/bin/ffmpeg -sample_rate 44100 -f s16le -ac 2

if it is possible, what #KODIPROP lines should be in strm file?
thanks.

[phunkyfish]

Does kodi play this correctly from the strm file? I.e. with no KODIPROPS?

[biGdada]

i havent checked it with strm file, but it doesnt play when i choose it from the GUI.
thats exactly the reason i'm trying to use ffmpegdirect do play it.
AFAIK, kodis built-in player cant play raw pcm because the stream lacks the relevant headers.
BUT, ffmpeg (the command line version) can read the file and convert it if i provide the command line parameters describing the format (-sample_rate 44100 -f s16le -ac 2). i was hoping there is a way to do the same with the plugin, considering the fact that it is based on ffmpeg.

[phunkyfish]

You should be able to pass arguments to ffmpeg using a | after the URL.

[biGdada]

its not a url, its a local file(a local pipe, to be exact)
tried it, and this is the error i'm getting :
ERROR <general>: AddOnLog: inputstream.ffmpegdirect: OpenWithCURL - error probing input format, /storage/.kodi/userdata/dockercdb/shairport-sync/tmp/shairport-sync-audio | -sample_rate 44100 -f s16le -ac 2
am i missing something?

[biGdada]

this is the contents of the strm file:

#KODIPROP:inputstream=inputstream.ffmpegdirect
/storage/.kodi/userdata/dockercdb/shairport-sync/tmp/shairport-sync-audio | -sample_rate 44100 -f s16le -ac 2

[phunkyfish]

It still needs to be a URL so must follow URL syntax, so like:

#KODIPROP:inputstream=inputstream.ffmpegdirect 
/storage/.kodi/userdata/dockercdb/shairport-sync/tmp/shairport-sync-audio|sample_rate=44100&f=s16le&ac=2

Assuming these are valid ffmpeg options of course.

[phunkyfish]

I’m not saying this will work, but it is how you can pass ffmpeg options to the addon.

[biGdada]

it didnt work.
is there a way to enable logging to see what parameters are being passed to ffmpeg?

[phunkyfish]

You can enable debug logging in Kodi and there is also an option to enable ffmpeg logging in the addon settings

All of the supported options are available here: https://ffmpeg.org/ffmpeg.html. I don’t see sample_rate though which is strange.

Is there a MIME type for audio stream? Maybe that would work.

[biGdada]

i've enabled debug logging and also ffmpeg logging in the addon but i cant see in the logs what are the exact parameters that are being passed to ffmpeg. i also tried to define the mime type, seems like its being ignored (mimetype=audio/wav;codec=pcm;rate=16000)

[phunkyfish]

As in:

#KODIPROP:mimetype=audio/wav;codec=pcm;rate=16000

[biGdada]

exactly.
the .strm file:
#KODIPROP:inputstream=inputstream.ffmpegdirect
#KODIPROP:mimetype=audio/wav;codec=pcm;rate=16000
/storage/.kodi/userdata/dockercdb/shairport-sync/tmp/shairport-sync-audio