Reading binary data from commands stdout

[RudolfVonKrugstein]

Hi,

I am trying to decode and load an mp3 as PCM Data (running on beam).

As I have not found any library for doing so, so I decided to use ffmpeg for that.

What works is, converting the mp3 to PCM using ffmpeg (with erlangs cmd function) to a temporary file and loading hat file.

But now I would like to avoid the temporary file, and directly read the the data from ffmpeg stdout (ffmpeg can output to stdout using "-" as filename).

But I am unable to read the binary data form ffmpeg stdout, because all ways of running system commands seem to not work in some way.
For example when running cmd the output is much shorted than expected.
I guess that might be because of decoding to utf8, but I dont know.
Any Idea what a good way of doing this would be?
Thank you!

[lpil]

I can't say I've tried this myself, so I can't help much. You may have more luck asking the Erlang folks as they know more about Erlang APIs.