Convert all non GST_FORMAT_BYTES to format bytes:
fixes:
GStreamer-CRITICAL **: gst_query_set_duration: assertion `format ==
g_value_get_enum (gst_structure_id_get_value (s, GST_QUARK (FORMAT)))'
failed
when playing more than one wav stream.
gst-plugins-base/tests/icles/playback/test7 uri1.wav uri2.wav