There is a problem with video files where audio encoded with Voxware codec. Even with all necessary .DLL and .AX files in /codecs/ there is still no sound:
Opening audio decoder: [dshow] Win32/DirectShow decoders
Warning: DS_Filter() source format is not accepted. (DLL=voxmsdec.ax)
ERROR: Could not open required DirectShow codec voxmsdec.ax.
ADecoder preinit failed :(
ADecoder init failed :(
Cannot find codec for audio format 0x75.
Audio: no sound