Merge commit '5d3addb937946eca5391e40b5e6308e74ac6f77b'

* commit '5d3addb937946eca5391e40b5e6308e74ac6f77b':
  Add a quality factor packet side data

Conflicts:
	doc/APIchanges
	ffmpeg.c
	libavcodec/avcodec.h
	libavcodec/mpegvideo_enc.c
	libavcodec/version.h

Merged-by: Michael Niedermayer <michael@niedermayer.cc>

ffmpeg.h

@@ -456,6 +456,9 @@ typedef struct OutputStream {
     // number of frames/samples sent to the encoder
     uint64_t frames_encoded;
     uint64_t samples_encoded;
+
+    /* packet quality factor */
+    int quality;
 } OutputStream;
 
 typedef struct OutputFile {