@@ -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}
Set the segment length in microseconds (will be deprecated, 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
+@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}
@@ -1263,6 +1263,7 @@ 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);
@@ -1290,10 +1291,18 @@ 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,
From: Vishwanath Dixit <vdixit@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(-)