From fde219cfa8f6e823c770d57b2fa2a2799a5445e2 Mon Sep 17 00:00:00 2001
From: Nicolas George <george@nsup.org>
Date: Sun, 29 Dec 2013 11:29:18 +0100
Subject: [PATCH] lavd/xv: report if no adaptor present.

---
 libavdevice/xv.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavdevice/xv.c b/libavdevice/xv.c
index ad604825f2..a4b44c8eda 100644
--- a/libavdevice/xv.c
+++ b/libavdevice/xv.c
@@ -149,6 +149,10 @@ static int xv_write_header(AVFormatContext *s)
         ret = AVERROR_EXTERNAL;
         goto fail;
     }
+    if (!num_adaptors) {
+        av_log(s, AV_LOG_ERROR, "No X-Video adaptors present\n");
+        return AVERROR(ENODEV);
+    }
     xv->xv_port = ai[0].base_id;
     XvFreeAdaptorInfo(ai);