From 9cfc1b3a840926435c2024fe7537e648405704fc Mon Sep 17 00:00:00 2001
From: Ivan Kalvachev <ikalvachev@gmail.com>
Date: Thu, 19 Feb 2009 08:39:47 +0000
Subject: [PATCH] Exit with error if MPV_common_init() is called with
 PIX_FMT_NONE. Give nice error message to fix codecs that call it this way.

Originally committed as revision 17452 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavcodec/mpegvideo.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavcodec/mpegvideo.c b/libavcodec/mpegvideo.c
index 409661eceb..2eec211abc 100644
--- a/libavcodec/mpegvideo.c
+++ b/libavcodec/mpegvideo.c
@@ -402,6 +402,11 @@ int MPV_common_init(MpegEncContext *s)
 
     s->mb_height = (s->height + 15) / 16;
 
+    if(s->avctx->pix_fmt == PIX_FMT_NONE){
+        av_log(s->avctx, AV_LOG_ERROR, "decoding to PIX_FMT_NONE is not supported.\n");
+        return -1;
+    }
+
     if(s->avctx->thread_count > MAX_THREADS || (s->avctx->thread_count > s->mb_height && s->mb_height)){
         av_log(s->avctx, AV_LOG_ERROR, "too many threads\n");
         return -1;