[FFmpeg-cvslog] hls: only seek if there is an offset

[Andreas Cadhalpun]

ffmpeg | branch: release/2.8 | Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com> | Tue Sep 22 13:40:20 2015 +0200| [173053a1252cfa67c1e4e2d2cf9484b44bfee2e3] | committer: Andreas Cadhalpun

hls: only seek if there is an offset

If there is no #EXT-X-BYTERANGE specified, there is no need to seek.
Seeking fails anyway for rtmp, because this protocol does not support
url_seek.

This fixes CNN.m3u from trac ticket 4797 (i.e. Debian bug #798189).

Reviewed-by: wm4 <nfxjfg at googlemail.com>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com>
(cherry picked from commit f9f0b4c08e7dc2c178ede137af4f64ca84ab2deb)
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=173053a1252cfa67c1e4e2d2cf9484b44bfee2e3
---

 libavformat/hls.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/hls.c b/libavformat/hls.c
index 6df95d4..adaa33a 100644
--- a/libavformat/hls.c
+++ b/libavformat/hls.c
@@ -1043,7 +1043,7 @@ static int open_input(HLSContext *c, struct playlist *pls)
     /* Seek to the requested position. If this was a HTTP request, the offset
      * should already be where want it to, but this allows e.g. local testing
      * without a HTTP server. */
-    if (ret == 0 && seg->key_type == KEY_NONE) {
+    if (ret == 0 && seg->key_type == KEY_NONE && seg->url_offset) {
         int seekret = ffurl_seek(pls->input, seg->url_offset, SEEK_SET);
         if (seekret < 0) {
             av_log(pls->parent, AV_LOG_ERROR, "Unable to seek to offset %"PRId64" of HLS segment '%s'\n", seg->url_offset, seg->url);