Added compat define for missing format.
#define AV_CODEC_ID_H264 CODEC_ID_H264
#endif
+#if LIBAVUTIL_VERSION_MAJOR < 52
+#define AV_PIX_FMT_YUV420P PIX_FMT_YUV420P
+#endif
+
/* Ubuntu 14.04 ships without the functions provided by avutil,
* so define error to string methods here. */
#if !defined(av_err2str)
