[FFmpeg-devel] [PATCH v3 02/11] avformat/dashenc: segmentation at the configured segment duration rate

[vdixit at akamai.com]

From: Vishwanath Dixit <vdixit at akamai.com>

When use_template is enabled and use_timeline is disabled, typically
it is required to generate the segments at the configured segment duration
rate on an average. This commit is particularly needed to handle the
segmentation when video frame rates are fractional like 29.97 or 59.94 fps.
---
 doc/muxers.texi       |  5 ++++-
 libavformat/dashenc.c | 13 +++++++++++--
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/doc/muxers.texi b/doc/muxers.texi
index 8dbfede..e1b6666 100644
--- a/doc/muxers.texi
+++ b/doc/muxers.texi
@@ -228,7 +228,10 @@ ffmpeg -re -i <input> -map 0 -map 0 -c:a libfdk_aac -c:v libx264
 @item -min_seg_duration @var{microseconds}
 This is a deprecated option to set the segment length in microseconds, use @var{seg_duration} instead.
 @item -seg_duration @var{duration}
-Set the segment length in seconds (fractional value can be set).
+Set the segment length in seconds (fractional value can be set). The value is
+treated as average segment duration when @var{use_template} is enabled and
+ at var{use_timeline} is disabled and as minimum segment duration for all the other
+use cases.
 @item -window_size @var{size}
 Set the maximum number of segments kept in the manifest.
 @item -extra_window_size @var{size}
diff --git a/libavformat/dashenc.c b/libavformat/dashenc.c
index 7169e11..ad52730 100644
--- a/libavformat/dashenc.c
+++ b/libavformat/dashenc.c
@@ -1267,6 +1267,7 @@ static int dash_write_packet(AVFormatContext *s, AVPacket *pkt)
     DASHContext *c = s->priv_data;
     AVStream *st = s->streams[pkt->stream_index];
     OutputStream *os = &c->streams[pkt->stream_index];
+    int64_t seg_end_duration, elapsed_duration;
     int ret;
 
     ret = update_stream_extradata(s, os, st->codecpar);
@@ -1294,10 +1295,18 @@ static int dash_write_packet(AVFormatContext *s, AVPacket *pkt)
     if (os->first_pts == AV_NOPTS_VALUE)
         os->first_pts = pkt->pts;
 
+    if (c->use_template && !c->use_timeline) {
+        elapsed_duration = pkt->pts - os->first_pts;
+        seg_end_duration = (int64_t) os->segment_index * c->seg_duration;
+    } else {
+        elapsed_duration = pkt->pts - os->start_pts;
+        seg_end_duration = c->seg_duration;
+    }
+
     if ((!c->has_video || st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) &&
         pkt->flags & AV_PKT_FLAG_KEY && os->packets_written &&
-        av_compare_ts(pkt->pts - os->start_pts, st->time_base,
-                      c->seg_duration, AV_TIME_BASE_Q) >= 0) {
+        av_compare_ts(elapsed_duration, st->time_base,
+                      seg_end_duration, AV_TIME_BASE_Q) >= 0) {
         int64_t prev_duration = c->last_duration;
 
         c->last_duration = av_rescale_q(pkt->pts - os->start_pts,
-- 
1.9.1