[FFmpeg-cvslog] avformat/nutenc: Document trailer index assert better

[Michael Niedermayer]

ffmpeg | branch: release/4.1 | Michael Niedermayer <michael at niedermayer.cc> | Fri Dec 14 21:52:09 2018 +0100| [f5859d4a8ee22f73d75d6b498d459700b034dd55] | committer: Michael Niedermayer

avformat/nutenc: Document trailer index assert better

Reviewed-by: Paul B Mahol <onemda at gmail.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 3a95b73abc868995b08ca2b4d8bbf2cda43184f8)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=f5859d4a8ee22f73d75d6b498d459700b034dd55
---

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

diff --git a/libavformat/nutenc.c b/libavformat/nutenc.c
index a92ff55c01..e9a3bb49db 100644
--- a/libavformat/nutenc.c
+++ b/libavformat/nutenc.c
@@ -1172,7 +1172,7 @@ static int nut_write_trailer(AVFormatContext *s)
 
     ret = avio_open_dyn_buf(&dyn_bc);
     if (ret >= 0 && nut->sp_count) {
-        av_assert1(nut->write_index);
+        av_assert1(nut->write_index); // sp_count should be 0 if no index is going to be written
         write_index(nut, dyn_bc);
         put_packet(nut, bc, dyn_bc, 1, INDEX_STARTCODE);
     }