dashenc: calculate stream bitrate from first segment if not available
authorPeter Große <pegro@friiks.de>
Mon, 30 Jan 2017 12:49:44 +0000 (13:49 +0100)
committerMartin Storsjö <martin@martin.st>
Mon, 30 Jan 2017 22:08:21 +0000 (00:08 +0200)
Bandwidth information is required in the manifest, but not always
provided by the demuxer. In that case calculate the bandwith based
on the size and duration of the first segment.

Signed-off-by: Peter Große <pegro@friiks.de>
Signed-off-by: Martin Storsjö <martin@martin.st>
libavformat/dashenc.c

index 98722cd..21acb90 100644 (file)
@@ -834,6 +834,16 @@ static int dash_flush(AVFormatContext *s, int final, int stream)
             if (ret < 0)
                 break;
         }
+
+        if (!os->bit_rate) {
+            // calculate average bitrate of first segment
+            int64_t bitrate = (int64_t) range_length * 8 * AV_TIME_BASE / (os->max_pts - os->start_pts);
+            if (bitrate >= 0) {
+                os->bit_rate = bitrate;
+                snprintf(os->bandwidth_str, sizeof(os->bandwidth_str),
+                     " bandwidth=\"%d\"", os->bit_rate);
+            }
+        }
         add_segment(os, filename, os->start_pts, os->max_pts - os->start_pts, start_pos, range_length, index_length);
         av_log(s, AV_LOG_VERBOSE, "Representation %d media segment %d written to: %s\n", i, os->segment_index, full_path);
     }