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What can BMPx play?

The simple answer is: almost everything your GStreamer installation can play back.

More complicatedly, BMPx uses GStreamer as the playback backend and thus can play whatever GStreamer can play on your system. It can generally output audio to whatever GStreamer can output to on your system. For the latter, there has to be explicit support added first, as we are taking care of every output possibility individually and want to have proper setup methods for it. Here is a general overview of what is supported, but they vary depending on your installation.
[edit] Audio Output Systems

* ALSA
* OSS
* ESD (Enlightened Sound Daemon) (Not well tested yet and reported to be crashing)
* SUN Audio (confirmed working)

[edit] Stream Types

* RIFF WAV
* Vorbis
* WMA
* M4A
* AAC
* FLAC
* Speex
* SHT (Shorten)
* TTA (True Audio)
* MOD-style file formats (vis libgstmodplug, pending on inclusion for 0.10.4)
* SID files (C64 .sid/.psid files)
* AC3
* MPC (Musepack)

[edit] Container Formats

Each container format can contain audio files, as the name suggests. Even so-called "OGGs" are just Vorbis files inside the OGG container. MKA can also contain Vorbis or MP3 streams; the same goes for OGM and, possibly, for AVI. (We're listing AVI just for the sake of completeness, we're not sure nor aware of audio-only AVI files that exist.)

* OGG
* OGM
* MKA (Matroska Audio)
* AVI