When constructing the MediaDecodingConfigurations to query media capabilities in `stream_utils.js`, the spelling of "fLaC" should not change to "flac" on Safari. This is because on Safari the query will return `supported: false` for "flac" but `supported: true` for "fLaC".
This change allows manifests with "fLaC" codecs to work properly on Safari when using MSE / Managed Media Source.
Fixes#6249
Adds a new player method, preload. This asynchronous method creates a PreloadManager object, which
will preload data for the given manifest, and which can be passed to the load method (in place of an asset URI)
in order to apply that preloaded data. This will allow for lower load latency; if you can predict what asset will
be loaded ahead of time (say, by preloading things the user is hovering their mouse over in a menu),
you can load the manifest before the user presses the load button.
Note that PreloadManagers are only meant to be used by the player instance that created them.
Closes#880
Co-authored-by: Álvaro Velad Galván <ladvan91@hotmail.com>
This PR introduces a live sync panic mode
(`streaming.liveSyncPanicMode`) which sets the player into the
`streaming.liveSyncMinPlaybackRate` while we're within the
`streaming.liveSyncPanicThreshold`. This should help reduce the change
of subsequent rebuffering events by moving further away from the live
edge.
Related to #6131.
## Background:
The native DOM Parser can perform poorly on some older devices, this
approach is faster on newer devices but is considerably better on older
devices.
This PR replaces the usage of the DOM Parser for DASH, MSS, VTT and
TTML.
The draw back of this approach that it does not include any validation
at the cost of better performance.
In our streams we have guarantee that every track will have a single
match in every period. This change allows `PeriodCombiner` to take
benefit of this knowledge.
I was testing `PeriodCombiner.combinePeriods()` performance of mentioned
changes on Tizen 2021 on 2 streams and I've got following results:
| content | upstream | proposed changes |
| - | -: | -: |
| stream 1 | 17 ms | 12 ms |
| stream 2 | 191 ms | 98 ms |
Both streams are VOD.
Stream 1 has 18 periods with 6 video & audio tracks in each.
Stream 2 has 18 periods with 6 video tracks & 36 audio tracks in each.
Summary of changes:
- create dummy streams during preparing arrays of input streams
- use hash map to quickly find perfect stream matches across periods
- hash map also automatically removes duplicates, so remove previous
logic for finding them
- check earlier are we trying to create output stream from dummy stream
- 2 changes from above also gives us a possibility to simplify
`areCompatible()` & `isBetterMatch()` methods
- reduce creation of spare collections when concatenating streams
- reduce conditional logic when possible
I was testing `PeriodCombiner.combinePeriods()` performance of mentioned
changes on Tizen 2021 on 2 streams and I've got following results:
| content | upstream | proposed changes |
| - | -: | -: |
| stream 1 | 23 ms | 17 ms |
| stream 2 | 484 ms | 191 ms |
Both streams are VOD.
Stream 1 has 18 periods with 6 video & audio tracks in each.
Stream 2 has 18 periods with 6 video tracks & 36 audio tracks in each.
This change removes `concat` util function from mp4 generator iterations
and runs it later, as well as stops creating new Uint8 arrays, as
`concat` does this within itself.
This change improves loop performance - creating new arrays is not
performant in large loops, and a traditional for loop is more performant
than for .. of for large concatenations
---------
Co-authored-by: Ivan Kohut <ivan.kohut@lamin.ar>
Co-authored-by: Álvaro Velad Galván <ladvan91@hotmail.com>
With the addition of the changeType API for MediaSource, it is theoretically possible for a variant to change between multiple codecs for a given buffer, over the course of playback.
This adds support for the DASH player to stitch together periods which have such multi-codec variants, but only as a last resort. For example, if one period only has audio in aac, and another period only has opus audio, the player will now stitch those periods together as one, but if there is a throughline that does not involve changing codecs it will go for that instead.
Closes#5961
Justin Swaney
Casey Occhialini
Julian Domingo
theodab
Gary Katsevman
Álvaro Velad Galván
Joey Parrish
Dave Nicholas
Mathieu Côté
Wojciech Tyczyński
Ivan
Viktor Vasylkovskyi
wjywbs
Vasanthavanan Devarajan
Koen Romers