[FFmpeg-cvslog] avformat/mxfenc: Do not crash if there is no packet in the first stream

[Michael Niedermayer]

ffmpeg | branch: release/2.4 | Michael Niedermayer <michael at niedermayer.cc> | Sun Dec 13 16:13:22 2015 +0100| [fc0f08f9fb5ef5d21f0790a71152a614c4fe7d72] | committer: Michael Niedermayer

avformat/mxfenc: Do not crash if there is no packet in the first stream

Fixes: Ticket4914

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit b51e7554e74cbf007a1cab83c7bed3ad9fa2793a)

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=fc0f08f9fb5ef5d21f0790a71152a614c4fe7d72
---

 libavformat/mxfenc.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavformat/mxfenc.c b/libavformat/mxfenc.c
index 3c0283b..7ffd6b6 100644
--- a/libavformat/mxfenc.c
+++ b/libavformat/mxfenc.c
@@ -2007,6 +2007,10 @@ static int mxf_write_packet(AVFormatContext *s, AVPacket *pkt)
         }
         mxf->edit_units_count++;
     } else if (!mxf->edit_unit_byte_count && st->index == 1) {
+        if (!mxf->edit_units_count) {
+            av_log(s, AV_LOG_ERROR, "No packets in first stream\n");
+            return AVERROR_PATCHWELCOME;
+        }
         mxf->index_entries[mxf->edit_units_count-1].slice_offset =
             mxf->body_offset - mxf->index_entries[mxf->edit_units_count-1].offset;
     }