avio_wb16(s, stream->frame_rate.num / stream->frame_rate.den); /* unknown meaning */
avio_wb32(s,0); /* unknown meaning */
avio_wb16(s, 8); /* unknown meaning */
avio_wb16(s, stream->frame_rate.num / stream->frame_rate.den); /* unknown meaning */
avio_wb32(s,0); /* unknown meaning */
avio_wb16(s, 8); /* unknown meaning */