#define AVERROR_EXPERIMENTAL (-0x2bb2afa8) ///< Requested feature is flagged experimental. Set strict_std_compliance if you really want to use it.
#define AVERROR_INPUT_CHANGED (-0x636e6701) ///< Input changed between calls. Reconfiguration is required. (can be OR-ed with AVERROR_OUTPUT_CHANGED)
#define AVERROR_OUTPUT_CHANGED (-0x636e6702) ///< Output changed between calls. Reconfiguration is required. (can be OR-ed with AVERROR_INPUT_CHANGED)
+/* HTTP & RTSP errors */
+#define AVERROR_HTTP_BAD_REQUEST FFERRTAG(0xF8,'4','0','0')
+#define AVERROR_HTTP_UNAUTHORIZED FFERRTAG(0xF8,'4','0','1')
+#define AVERROR_HTTP_FORBIDDEN FFERRTAG(0xF8,'4','0','3')
+#define AVERROR_HTTP_NOT_FOUND FFERRTAG(0xF8,'4','0','4')
+#define AVERROR_HTTP_OTHER_4XX FFERRTAG(0xF8,'4','X','X')
+#define AVERROR_HTTP_SERVER_ERROR FFERRTAG(0xF8,'5','X','X')
#define AV_ERROR_MAX_STRING_SIZE 64