From 7f7c494a3340f71046dde62aa1939128600854a4 Mon Sep 17 00:00:00 2001
From: James Zern <jzern-at-google.com@ffmpeg.org>
Date: Fri, 14 Oct 2016 00:33:50 -0700
Subject: [PATCH] ffmpeg_cleanup: fix crash with unrecognized codec

since:
3e5e5bd Merge commit '398f015f077c6a2406deffd9e37ff34b9c7bb3bc'

Signed-off-by: James Zern <jzern@google.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 ffmpeg.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ffmpeg.c b/ffmpeg.c
index 693981f077..af8ed76a60 100644
--- a/ffmpeg.c
+++ b/ffmpeg.c
@@ -533,7 +533,7 @@ static void ffmpeg_cleanup(int ret)
         avcodec_free_context(&ost->enc_ctx);
         avcodec_parameters_free(&ost->ref_par);
 
-        while (av_fifo_size(ost->muxing_queue)) {
+        while (ost->muxing_queue && av_fifo_size(ost->muxing_queue)) {
             AVPacket pkt;
             av_fifo_generic_read(ost->muxing_queue, &pkt, sizeof(pkt), NULL);
             av_packet_unref(&pkt);