fixing some seek failure issues

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@2688 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

ffplay.c

@@ -1406,15 +1406,16 @@ static int decode_thread(void *arg)
 #endif
         if (is->seek_req) {
             /* XXX: must lock decoder threads */
+            ret = av_seek_frame(is->ic, -1, is->seek_pos);
+            if (ret < 0) {
+                fprintf(stderr, "%s: error while seeking\n", is->ic->filename);
+            }else{
                 if (is->audio_stream >= 0) {
                     packet_queue_flush(&is->audioq);
                 }
                 if (is->video_stream >= 0) {
                     packet_queue_flush(&is->videoq);
                 }
-            ret = av_seek_frame(is->ic, -1, is->seek_pos);
-            if (ret < 0) {
-                fprintf(stderr, "%s: error while seeking\n", is->ic->filename);
             }
             is->seek_req = 0;
         }

libavformat/avidec.c

@@ -496,6 +496,7 @@ static int avi_load_index(AVFormatContext *s)
     AVIContext *avi = s->priv_data;
     ByteIOContext *pb = &s->pb;
     uint32_t tag, size;
+    offset_t pos= url_ftell(pb);
     
     url_fseek(pb, avi->movi_end, SEEK_SET);
 #ifdef DEBUG_SEEK
@@ -529,6 +530,7 @@ static int avi_load_index(AVFormatContext *s)
         }
     }
  the_end:
+    url_fseek(pb, pos, SEEK_SET);
     return 0;
 }