[FFmpeg-cvslog] avformat/av1: Initialize padding in ff_isom_write_av1c

[Jeremy Dorfman via ffmpeg-devel]

ffmpeg | branch: master | Jeremy Dorfman via ffmpeg-devel <ffmpeg-devel at ffmpeg.org> | Mon Apr  8 08:14:27 2019 -0400| [bb5efd1727eeecc9be8f1402810c7ab72344eed3] | committer: James Almer

avformat/av1: Initialize padding in ff_isom_write_av1c

Otherwise, AV1 encodes with FFmpeg trigger use-of-uninitialized-value
warnings under MemorySanitizer, and the output buffer potentially
changes from run to run.

Signed-off-by: James Almer <jamrial at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=bb5efd1727eeecc9be8f1402810c7ab72344eed3
---

 libavformat/av1.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libavformat/av1.c b/libavformat/av1.c
index a0aad436a6..5fde8df97e 100644
--- a/libavformat/av1.c
+++ b/libavformat/av1.c
@@ -372,6 +372,7 @@ int ff_isom_write_av1c(AVIOContext *pb, const uint8_t *buf, int size)
     put_bits(&pbc, 1, seq_params.chroma_subsampling_x);
     put_bits(&pbc, 1, seq_params.chroma_subsampling_y);
     put_bits(&pbc, 2, seq_params.chroma_sample_position);
+    put_bits(&pbc, 8, 0); // padding
     flush_put_bits(&pbc);
 
     avio_write(pb, header, sizeof(header));