From 69174fad736e4ced0010a25e0fde5389ba9c77f0 Mon Sep 17 00:00:00 2001
From: Nicolas George <nicolas.george@normalesup.org>
Date: Sun, 11 Mar 2012 00:19:50 +0100
Subject: vf_thumbnail: forward request_frame at least once.

The current version relied on poll_frame to request
the very first frame, that would not work if the
surrounding code does not call poll_frame.
---
 libavfilter/vf_thumbnail.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'libavfilter/vf_thumbnail.c')

diff --git a/libavfilter/vf_thumbnail.c b/libavfilter/vf_thumbnail.c
index fe4a086493..0b7ba06482 100644
--- a/libavfilter/vf_thumbnail.c
+++ b/libavfilter/vf_thumbnail.c
@@ -176,11 +176,11 @@ static int request_frame(AVFilterLink *link)
 
     /* loop until a frame thumbnail is available (when a frame is queued,
      * thumb->n is reset to zero) */
-    while (thumb->n) {
+    do {
         int ret = avfilter_request_frame(link->src->inputs[0]);
         if (ret < 0)
             return ret;
-    }
+    } while (thumb->n);
     return 0;
 }
 
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