isom: only write the size if its non zero in mov_rewrite_dvd_sub_extradata()

Sample-Id: NeroRecodeSample.mp4
11 years ago · 96138e8c8d
parent 9bd4a9f4ee
commit 96138e8c8d
1 changed files with 4 additions and 2 deletions
--- a/libavformat/isom.c
+++ b/libavformat/isom.c
@ -446,8 +446,10 @@ static int mov_rewrite_dvd_sub_extradata(AVStream *st)
    if (st->codec->extradata_size != 64)
        return 0;

-    snprintf(buf, sizeof(buf), "size: %dx%d\npalette: ",
-             st->codec->width, st->codec->height);
+    if (st->codec->width > 0 &&  st->codec->height > 0)
+        snprintf(buf, sizeof(buf), "size: %dx%d\n",
+                 st->codec->width, st->codec->height);
+    av_strlcat(buf, "palette: ", sizeof(buf));

    for (i = 0; i < 16; i++) {
        uint32_t yuv = AV_RB32(src + i * 4);