avformat/yuv4mpegdec: Use 64bit for file offset

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/yuv4mpegdec.c

@@ -270,7 +270,8 @@ static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt)
 {
     int i;
     char header[MAX_FRAME_HEADER+1];
-    int ret, off = avio_tell(s->pb);
+    int ret;
+    int64_t off = avio_tell(s->pb);
 
     for (i = 0; i < MAX_FRAME_HEADER; i++) {
         header[i] = avio_r8(s->pb);