+ /**
+ * Encoding only.
+ *
+ * For hardware encoders configured to use a hwaccel pixel format, this
+ * field should be set by the caller to a reference to the AVHWFramesContext
+ * describing input frames. AVHWFramesContext.format must be equal to
+ * AVCodecContext.pix_fmt.
+ *
+ * This field should be set before avcodec_open2() is called and is
+ * afterwards owned and managed by libavcodec.
+ */
+ AVBufferRef *hw_frames_ctx;
+
+ /**
+ * Control the form of AVSubtitle.rects[N]->ass
+ * - decoding: set by user
+ * - encoding: unused
+ */
+ int sub_text_format;
+#define FF_SUB_TEXT_FMT_ASS 0
+#if FF_API_ASS_TIMING
+#define FF_SUB_TEXT_FMT_ASS_WITH_TIMINGS 1
+#endif
+