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-rw-r--r--libavcodec/4xm.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libavcodec/4xm.c b/libavcodec/4xm.c
index e2798587af..aca86181ba 100644
--- a/libavcodec/4xm.c
+++ b/libavcodec/4xm.c
@@ -340,7 +340,7 @@ static int decode_p_frame(FourXContext *f, uint8_t *buf, int length){
const int stride= f->current_picture.linesize[0]>>1;
unsigned int bitstream_size, bytestream_size, wordstream_size, extra;
- if(!get32(buf-4)){
+ if(f->version){
extra=20;
bitstream_size= get32(buf+8);
wordstream_size= get32(buf+12);