The logic is applicable only when use_template is enabled and use_timeline
is disabled. The logic monitors the flow of segment indexes. If a streams's
segment index value is not at the expected real time position, then
the logic corrects that index value.
Typically this logic is needed in live streaming use cases. The network
bandwidth fluctuations are common during long run streaming. Each
fluctuation can cause the segment indexes fall behind the expected real
time position. Without this logic, players will not be able to consume
the content, even after encoder's network condition comes back to
normal state.
availability time of Nth segment = availabilityStartTime + (N*segment duration) - availabilityTimeOffset.
This field helps to reduce the latency by about a segment duration in streaming mode.
@availabilityStartTime specifies the anchor for the computation of the earliest
availability time (in UTC) for any Segment in the Media Presentation.
As per this requirement, the @AvailabilityStartTime should be set to the
wallclock time at which the first frame of the first segment begins encoding.
But, it was getting set only when the first segment was completely ready. Making
the required correction in this patch. This correction is mainly needed to reduce
the latency in live streaming use cases.
Calling 'write_manifest' from 'write_header' was causing creation of
first MPD with invalid values. Ex: zero @duration param value. Also,
the manifest files (MPD or M3U8s) should be created when at-least
one media frame is ready for consumption.
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.
There are use cases where average segment duration needs to be configured
and muxer is expected to maintain the average segment duration. So, using
the name 'min_seg_duration' will be misleading. So, changing the parameter
name to 'seg_duration', where it can be minimum segment duration or average
segment duration based on the use-case. The additional updates needed for
this functinality are made the sub-sequent patches of this patch series.
Currently http end of chunk is signalled implicitly in dashenc_io_open().
This mean playlists http writes would have to wait upto a segment duration to signal end of chunk causing delays.
This patch will fix that problem and improve performance.
This is required for AV playout from master.m3u8.
Otherwise master.m3u8 lists only video-only and/or audio-only streams.
Reviewed-by: Steven Liu <lq@chinaffmpeg.org>
This is to take full advantage of Common Media Application Format(CMAF).
Now server can generate one content and serve both HLS and DASH players.
Reviewed-by: Steven Liu <lq@onvideo.cn>
In the DASHContext structure, min_seg_duration is declared as an int,
but the AVOption list claimed it was an INT64. Change the option list
to use the correct size, which should fix some initialization errors
seen on big-endian platforms.
Signed-off-by: James Cowgill <jcowgill@debian.org>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Leads to setting of DefaultDuration in Matroska muxer based on frame rate instead of timebase.
Fixes playback in Chrome.
Signed-off-by: Peter Große <pegro@friiks.de>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Fix conformance regarding section "3.2.4. Presence of Attributes and
Element" of the "Guidelines for Implementation: DASH-IF Interoperability
Points V4.1" (http://dashif.org/guidelines/)
Signed-off-by: Anton Schubert <ischluff@mailbox.org>
Signed-off-by: Peter Große <pegro@friiks.de>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Fixes: 1b8ef01f04 ("dashenc: add webm support")
Signed-off-by: Peter Große <pegro@friiks.de>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This patch is inspired by the ffmpeg webm_chunk muxer and fixes that all resulting
tracks have the same track number.
Signed-off-by: Peter Große <pegro@friiks.de>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Anton Schubert <ischluff@mailbox.org>
Signed-off-by: Peter Große <pegro@friiks.de>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
* commit 'dce2929efa8e82b0832a828f7e8cb81ff8c20a4e':
dashenc: copy language and role metadata from streams assigned to sets
Merged-by: Rodger Combs <rodger.combs@gmail.com>
* commit 'efd2fc41b3f0749f9715d50b581f22bbaa8c5b99':
dashenc: allow assigning all streams of a media type to an AdaptationSet
Merged-by: Rodger Combs <rodger.combs@gmail.com>
* commit '3d23a5f96ad72961c14ba3a0c2add8f2ab374b61':
dashenc: add support for assigning streams to AdaptationSets
Merged-by: Rodger Combs <rodger.combs@gmail.com>
