Created attachment 347266 [details] [review]
patch created on 1.8.1 version

In aacparse element, setting pipeline from PLAYING to NULL does not reset

  gint           sample_rate;
  gint           channels;

properties.

Therefore in the ADTS scenario, when moving pipeline to PAUSE state again, src CAPS are not created in gst_aac_parse_handle_frame.
In fact the following if statement is checked and if match occurs CAPS are not being created

    if (G_UNLIKELY (rate != aacparse->sample_rate
            || channels != aacparse->channels)) 

Actual result: audio streaming is not recovered and gstreamer aac elemnt issues:

gst_base_parse_push_frame <aac-parse> error: No caps set


A similar fix exists for LOAS scenario, where 

    /* We want to set caps both at start, and when rate/channels change.
       Since only some LOAS frames have that info, we may receive frames
       before knowing about rate/channels. */
    if (setcaps
        || !gst_pad_has_current_caps (GST_BASE_PARSE_SRC_PAD (aacparse))) {
      if (!gst_aac_parse_set_src_caps (aacparse, NULL)) {