adds an optional `--hls_start_time_offset` parameter, that, when
used, adds `EXT-X-START` tags to the HLS media playlists.
The EXT-X-START tag allows to specify the location where the player
starts playing, either from start (positive value) or from end (negative
value).
This is especially useful in case of livestreams where this tag can be
used to set the target latency of the playback.
Reference: https://datatracker.ietf.org/doc/html/rfc8216#section-4.3.5.2
The RFC says, that the `EXT-X-START` tag could also be added to the
master playlist, but my tests have shown that most players only respect
it when it's in the media playlists.
Fixes#970
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Co-authored-by: Joey Parrish <joeyparrish@google.com>
This will force the muxer to order streams in the order given on the
command-line.
Closes#560Closes#1280Closes#1313
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Co-authored-by: Joey Parrish <joeyparrish@users.noreply.github.com>
Co-authored-by: Cosmin Stejerean <cstejerean@meta.com>
HLS uses the EXT-X-MEDIA-SEQUENCE tag at the start of a live playlist in
order to specify the first segment sequence number. This is because any
live playlist have a limited number of segments, and they also keep
updating with new segments while removing old ones. When a player refreshes
the playlist, this information is important for keeping track of segments
positions.
When the packager starts, it naturally starts this count from zero. However,
there are many situations where the packager may be restarted, without this
meaning starting this value from zero (but continuing a previous sequence).
The most common situations are problems in the encoder feeding the packager.
With those cases in mind, this parameter allows to set the initial
EXT-X-MEDIA-SEQUENCE value. This way, it's possible to continue the sequence
number from previous packager run.
Closes#691.
It allows users to override the default language for text tracks.
If not specified, --default_language applies to both audio and text
tracks.
Issue #430.
Change-Id: I86a9baba2072be27b6661fa7b65a8bc8b6adb3cc
The number of preserved segments outside live window can be
configured using flag --preserved_segments_outside_live_window,
which is default to 50, i.e. 5 minutes for 6s segment.
Note that the segment removal will be disabled if it is set to 0.
Only HLS live playlist and DASH dynamic MPD are affected by this flag.
- Also add end to end tests.
Fixes#223.
Change-Id: I8a566efebe2f1552c7d9509ab017bade5a4a1c98
- Add --time_shift_buffer_depth to HLS doc.
- Fix a problem in HLS tutorial
Partially address #304, fixes#305
Change-Id: I60bc1eb659a30beb0a6ab73433f4cc99a7deab07
SteveR-PMP
Marcus Wichelmann
Joey Parrish
sr90
Daniel Cantarín
KongQun Yang