@@ -202,7 +202,7 @@ int64_t url_seek(URLContext *h, int64_t pos, int whence)

     if (!h->prot->url_seek)

         return AVERROR(EPIPE);

-    ret = h->prot->url_seek(h, pos, whence);

+    ret = h->prot->url_seek(h, pos, whence & ~AVSEEK_FORCE);

     return ret;

 }

@@ -192,6 +192,14 @@ int64_t av_url_read_seek(URLContext *h, int stream_index,

  */

 #define AVSEEK_SIZE 0x10000

+/**

+ * Oring this flag as into the "whence" parameter to a seek function causes it to

+ * seek by any means (like reopening and linear reading) or other normally unreasonble

+ * means that can be extreemly slow.

+ * This may be ignored by the seek code.

+ */

+#define AVSEEK_FORCE 0x20000

+

 typedef struct URLProtocol {

     const char *name;

     int (*url_open)(URLContext *h, const char *url, int flags);

@@ -150,8 +150,9 @@ int64_t url_fseek(ByteIOContext *s, int64_t offset, int whence)

         offset1 >= 0 && offset1 <= (s->buf_end - s->buffer)) {

         /* can do the seek inside the buffer */

         s->buf_ptr = s->buffer + offset1;

-    } else if(s->is_streamed && !s->write_flag &&

-              offset1 >= 0 && offset1 < (s->buf_end - s->buffer) + (1<<16)){

+    } else if(s->is_streamed && !s->write_flag && offset1 >= 0 &&

+              (   offset1 < (s->buf_end - s->buffer) + (1<<16)

+               || (whence & AVSEEK_FORCE))){

         while(s->pos < offset && !s->eof_reached)

             fill_buffer(s);

         if (s->eof_reached)