EVS decoding should use PCM output extension
Related to #111 (closed)
In !209 (merged) EVS decoding was enabled when -stereo_dmx_evs
is specifed. This should however use a .pcm
extension otherwise subsequent processes in the chain try to parse PCM data as a WAV header, leading to errors.
This MR specifies the correct file extension, and then converts the output file to WAV after decoding for subsequent processing steps.