gstomxvideoenc: Set bitrate in setcaps

Otherwise it gets lost whenever we configure new caps

https://bugzilla.gnome.org/show_bug.cgi?id=698049

omx/gstomxvideoenc.c

@@ -1246,6 +1246,21 @@ gst_omx_video_enc_set_format (GstVideoEncoder * encoder,
           NULL) != OMX_ErrorNone)
     return FALSE;
 
+  if (self->target_bitrate != 0xffffffff) {
+    OMX_VIDEO_PARAM_BITRATETYPE config;
+    OMX_ERRORTYPE err;
+
+    GST_OMX_INIT_STRUCT (&config);
+    config.nPortIndex = self->enc_out_port->index;
+    config.nTargetBitrate = self->target_bitrate;
+    config.eControlRate = self->control_rate;
+    err = gst_omx_component_set_parameter (self->enc,
+        OMX_IndexParamVideoBitrate, &config);
+    if (err != OMX_ErrorNone)
+      GST_ERROR_OBJECT (self, "Failed to set bitrate parameter: %s (0x%08x)",
+          gst_omx_error_to_string (err), err);
+  }
+
   GST_DEBUG_OBJECT (self, "Enabling component");
   if (needs_disable) {
     if (gst_omx_port_set_enabled (self->enc_in_port, TRUE) != OMX_ErrorNone)