schroenc: Set keyframe interval

Originally committed as revision 23027 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/libschroedingerenc.c

@@ -153,6 +153,8 @@ static int libschroedinger_encode_init(AVCodecContext *avccontext)
             schro_encoder_setting_set_double(p_schro_params->encoder,
                                              "enable_noarith", 1);
     } else {
+        schro_encoder_setting_set_double(p_schro_params->encoder,
+                                         "au_distance", avccontext->gop_size);
         avccontext->has_b_frames = 1;
     }