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-rw-r--r--libavformat/wtv.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/libavformat/wtv.c b/libavformat/wtv.c
index 23b662d871..8b927466cf 100644
--- a/libavformat/wtv.c
+++ b/libavformat/wtv.c
@@ -472,6 +472,7 @@ static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)
st->codec->codec_id = AV_CODEC_ID_MJPEG;
st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
st->codec->extradata = av_mallocz(filesize);
+ st->id = -1;
if (!st->codec->extradata)
goto done;
st->codec->extradata_size = filesize;