mov: Validate the ID number

IDs in MOV start from 1.

Signed-off-by: Diego Biurrun <diego@biurrun.de>

libavformat/mov.c

@@ -1949,8 +1949,8 @@ static int mov_read_stsc(MOVContext *c, AVIOContext *pb, MOVAtom atom)
         sc->stsc_data[i].first = avio_rb32(pb);
         sc->stsc_data[i].count = avio_rb32(pb);
         sc->stsc_data[i].id = avio_rb32(pb);
-        if (sc->stsc_data[i].id < 0 || sc->stsc_data[i].id > sc->stsd_count) {
-            sc->stsc_data[i].id = 0;
+        if (sc->stsc_data[i].id <= 0 || sc->stsc_data[i].id > sc->stsd_count) {
+            sc->stsc_data[i].id = 1;
             if (c->fc->error_recognition & AV_EF_EXPLODE) {
                 av_log(c->fc, AV_LOG_ERROR, "Invalid stsc index.\n");
                 return AVERROR_INVALIDDATA;