@@ -221,6 +221,7 @@ vorbis_header (AVFormatContext * s, int idx)

     if (os->buf[os->pstart] == 1) {

         const uint8_t *p = os->buf + os->pstart + 7; /* skip "\001vorbis" tag */

         unsigned blocksize, bs0, bs1;

+        int srate;

         if (os->psize != 30)

             return -1;

@@ -229,7 +230,7 @@ vorbis_header (AVFormatContext * s, int idx)

             return -1;

         st->codec->channels = bytestream_get_byte(&p);

-        st->codec->sample_rate = bytestream_get_le32(&p);

+        srate = bytestream_get_le32(&p);

         p += 4; // skip maximum bitrate

         st->codec->bit_rate = bytestream_get_le32(&p); // nominal bitrate

         p += 4; // skip minimum bitrate

@@ -249,8 +250,11 @@ vorbis_header (AVFormatContext * s, int idx)

         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

         st->codec->codec_id = CODEC_ID_VORBIS;

-        st->time_base.num = 1;

-        st->time_base.den = st->codec->sample_rate;

+        if (srate > 0) {

+            st->codec->sample_rate = srate;

+            st->time_base.num = 1;

+            st->time_base.den = srate;

+        }

     } else if (os->buf[os->pstart] == 3) {

         if (os->psize > 8)

             ff_vorbis_comment (s, &st->metadata, os->buf + os->pstart + 7, os->psize - 8);