hls: call avformat_find_stream_info()

This is needed to correctly demux h264 in ts
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/hls.c

@@ -526,6 +526,10 @@ static int hls_read_header(AVFormatContext *s)
         }
         v->ctx->pb       = &v->pb;
         ret = avformat_open_input(&v->ctx, v->segments[0]->url, in_fmt, NULL);
+        if (ret < 0)
+            goto fail;
+        v->ctx->probesize = 0;
+        ret = avformat_find_stream_info(v->ctx, NULL);
         if (ret < 0)
             goto fail;
         v->stream_offset = stream_offset;