So this is not the clue…
What can I else install, that OpenShot can "see" as available codecs?
And maybe should OpenShot force itself to require all compatible codecs, using dependencies (Debian compatible), so there's nothing to install more? I got no idea now. I can choose between:
none, aac, ac3, ac3_fixed, adpcm_adx, adpcm_ima_qt, adpcm_ima_wav, adpcm_ms, adpcm_swf, adpcm_yamaha, alac, dca, eac3, flac, g722, g723_1, g726, libaacplus, libfaac, libgsm, libgsm_ms, libmp3lame, libopencore_amrnb, libspeex, libvo_aacenc, libvo_amrwbenc, libvorbis, mp2, nellymoser, real_144, roq_dcpm, sonic, sonicls, vorbis, wmav1, wmav2.
I'm really confused. Only lossless I know seems to be FLAC (maybe libFAAC too?). I'm not sure if FLAC can support all samplings that WAVE can.