Before, {text_,}{w,h} vars hadn't got initialized
---
 libavfilter/vf_drawtext.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/libavfilter/vf_drawtext.c b/libavfilter/vf_drawtext.c
index 4c4ad5e..6373129 100644
--- a/libavfilter/vf_drawtext.c
+++ b/libavfilter/vf_drawtext.c
@@ -550,7 +550,9 @@ static int dtext_prepare_text(AVFilterContext *ctx)
     y     = FFMIN(y + text_height, height - 1);
 
     dtext->w = str_w;
+    dtext->var_values[VAR_TEXT_W] = dtext->var_values[VAR_TW] = dtext->w;
     dtext->h = y;
+    dtext->var_values[VAR_TEXT_H] = dtext->var_values[VAR_TH] = dtext->h;
 
     return 0;
 }
-- 
1.7.3.4

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