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-rw-r--r--libavcodec/utils.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index f441ca2..050f26e 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -305,6 +305,9 @@ int avcodec_open(AVCodecContext *avctx, AVCodec *codec)
{
int ret;
+ if(avctx->codec)
+ return -1;
+
avctx->codec = codec;
avctx->codec_id = codec->id;
avctx->frame_number = 0;
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