https://bugs.gentoo.org/show_bug.cgi?id=476494

A better patch using avcodec_decode_audio4 will be needed but for now this
fixes the problem.

Index: k3b-2.0.2/plugins/decoder/ffmpeg/k3bffmpegwrapper.cpp
===================================================================
--- k3b-2.0.2.orig/plugins/decoder/ffmpeg/k3bffmpegwrapper.cpp
+++ k3b-2.0.2/plugins/decoder/ffmpeg/k3bffmpegwrapper.cpp
@@ -37,6 +37,9 @@ extern "C" {
 
 #include <klocale.h>
 
+#ifndef AVCODEC_MAX_AUDIO_FRAME_SIZE
+#define AVCODEC_MAX_AUDIO_FRAME_SIZE (192000 * 4)
+#endif
 
 #if LIBAVFORMAT_BUILD < 4629
 #define FFMPEG_BUILD_PRE_4629