lavc/encode: pass through frame durations to encoded packets

The generic code can only handle the no-delay case. Encoders with delay
need to be handled individually, which will be done in the following
commits.

1 files changed, 7 insertions, 0 deletions

diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 832b9d9575..90b437ccbe 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -268,6 +268,13 @@ typedef struct RcOverride{
  */
 #define AV_CODEC_FLAG_COPY_OPAQUE     (1 <<  7)
 /**
+ * Signal to the encoder that the values of AVFrame.duration are valid and
+ * should be used (typically for transferring them to output packets).
+ *
+ * If this flag is not set, frame durations are ignored.
+ */
+#define AV_CODEC_FLAG_FRAME_DURATION  (1 <<  8)
+/**
  * Use internal 2pass ratecontrol in first pass mode.
  */
 #define AV_CODEC_FLAG_PASS1           (1 <<  9)