From 04d24012e15079da8099a0b89392f87dff334051 Mon Sep 17 00:00:00 2001
From: Henrik Rydgard <hrydgard@gmail.com>
Date: Sun, 9 Jun 2013 13:45:48 +0200
Subject: [PATCH] Prevent crashing the emu in stepVideo when things have gone
 very wrong.

---
 Core/HW/MediaEngine.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Core/HW/MediaEngine.cpp b/Core/HW/MediaEngine.cpp
index d6818c4ca1..39480e929d 100644
--- a/Core/HW/MediaEngine.cpp
+++ b/Core/HW/MediaEngine.cpp
@@ -332,7 +332,7 @@ bool MediaEngine::setVideoDim(int width, int height)
 void MediaEngine::updateSwsFormat(int videoPixelMode) {
 #ifdef USE_FFMPEG
 	AVPixelFormat swsDesired = getSwsFormat(videoPixelMode);
-	if (swsDesired != m_sws_fmt) {
+	if (swsDesired != m_sws_fmt && m_pCodecCtx != 0) {
 		m_sws_fmt = swsDesired;
 		m_sws_ctx = sws_getCachedContext
 			(
@@ -353,6 +353,10 @@ void MediaEngine::updateSwsFormat(int videoPixelMode) {
 }
 
 bool MediaEngine::stepVideo(int videoPixelMode) {
+	if (!m_pFormatCtx)
+		return false;
+	if (!m_pCodecCtx)
+		return false;
 
 	// if video engine is broken, force to add timestamp
 	m_videopts += 3003;