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dashenc: calculate stream bitrate from first segment if not available

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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>
This commit is contained in:
Peter Große 2017-01-30 13:49:44 +01:00 committed by Martin Storsjö
parent e519dcd937
commit 9df9309d23
1 changed files with 10 additions and 0 deletions
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10
libavformat/dashenc.c
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@ -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);
}