Twitch Buffering 2017 Chrome

Twitch Buffering 2017 Chrome

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Twitch Buffering 2017 Chrome Web
Audio/VideoEverything you need to know about audio/video inside Chromium and Chromium OS!Whom To ContactIt's best to have discussions on chromium-dev@chromium.org or media-dev@chromium.org for media specific matters.
We are component Internals>Media on the Chromium bug tracker.
DocumentationSee media/README.md. For historical reference, here's the original design doc for HTML5 audio/video.
Container formats
MP4 (QuickTime/ MOV / MPEG4)
Ogg
WebM
WAV
HLS [Only on Android and only single-origin manifests]

FLAC
MP3
Opus
PCM 8-bit unsigned integer
PCM 16-bit signed integer little endian
PCM 32-bit float little endian
PCM μ-law
Vorbis
AAC [Main, LC, HE profiles only, xHE-AAC on Android P+] [Google Chrome only]
AMR-NB [Google Chrome OS only]
AMR-WB [Google Chrome OS only]
GSM [Google Chrome OS Only]
VP8
VP9
AV1 [Only Chrome OS, Linux, macOS, and Windows at present]
Theora [Except on Android variants]
H.264 [Google Chrome only]
MPEG-4 [Google Chrome OS only]
Code Locationmedia/ - Home to all things media!
media/audio - OS audio input/output abstractions
media/video/capture - OS camera input abstraction
media/video - software/hardware video decoder interfaces + implementations
third_party/ffmpeg - Chromium's copy of FFmpeg
third_party/libvpx - Chromium's copy of libvpx
third_party/blink/renderer/core/html/media/html_media_element.{cpp,h,idl} - media element base class
third_party/blink/renderer/core/html/media/html_audio_element.{cpp,h,idl} - audio element implementation
third_party/blink/renderer/core/html/media/html_video_element.{cpp,h,idl} - video element implementation
media/base/mime_util.cc - defines canPlayType() behaviour and file extension mapping
media/blink/buffered_data_source.{cc,h} - Chromium's main implementation of DataSource for the media pipeline
media/blink/buffered_resource_loader.{cc,h} - Implements the sliding window buffering strategy (see below)
third_party/blink/public/platform/web_media_player.h - Blink's media player interface for providing HTML5 audio/video functionality
media/blink/webmediaplayer_impl.{cc,h} - Chromium's main implementation of WebMediaPlayer
How does everything get instantiated?WebFrameClient::createMediaPlayer() is the Blink embedder API for creating a WebMediaPlayer and passing it back to Blink. Every HTML5 audio/video element will ask the embedder to create a WebMediaPlayer.
For Chromium this is handled in RenderFrameImpl.
GN FlagsThere are a few GN flags which can alter the behaviour of Chromium's HTML5 audio/video implementation.
ffmpeg_branding
 Default: $(branding)
 Chrome - includes additional proprietary codecs (MP3, etc.) for use with Google Chrome

 Alters the list of codecs Chromium claims to support, which affects  and canPlayType() behaviour
 Values:
 0/false -  and canPlayType() assume the default set of codecs
 1/true -  and canPlayType() assume they support additional proprietary codecs
How the %#$& does buffering work?Chromium uses a combination of range requests and an in-memory sliding window to buffer media. We have a low and high watermark that is used to determine when to purposely stall the HTTP request and when to resume the HTTP request.
It's complicated, so here's a picture:

Audio/VideoEverything you need to know about audio/video inside Chromium and Chromium OS!Whom To ContactIt's best to have discussions on chromium-dev@chromium.org or media-dev@chromium.org for media specific matters.
We are component Internals>Media on the Chromium bug tracker.
DocumentationSee media/README.md. For historical reference, here's the original design doc for HTML5 audio/video.
Container formats
MP4 (QuickTime/ MOV / MPEG4)
Ogg
WebM
WAV
HLS [Only on Android and only single-origin manifests]

FLAC
MP3
Opus
PCM 8-bit unsigned integer
PCM 16-bit signed integer little endian
PCM 32-bit float little endian
PCM μ-law
Vorbis
AAC [Main, LC, HE profiles only, xHE-AAC on Android P+] [Google Chrome only]
AMR-NB [Google Chrome OS only]
AMR-WB [Google Chrome OS only]
GSM [Google Chrome OS Only]
VP8
VP9
AV1 [Only Chrome OS, Linux, macOS, and Windows at present]
Theora [Except on Android variants]
H.264 [Google Chrome only]
MPEG-4 [Google Chrome OS only]
Code Locationmedia/ - Home to all things media!
media/audio - OS audio input/output abstractions
media/video/capture - OS camera input abstraction
media/video - software/hardware video decoder interfaces + implementations
third_party/ffmpeg - Chromium's copy of FFmpeg
third_party/libvpx - Chromium's copy of libvpx
third_party/blink/renderer/core/html/media/html_media_element.{cpp,h,idl} - media element base class
third_party/blink/renderer/core/html/media/html_audio_element.{cpp,h,idl} - audio element implementation
third_party/blink/renderer/core/html/media/html_video_element.{cpp,h,idl} - video element implementation
media/base/mime_util.cc - defines canPlayType() behaviour and file extension mapping
media/blink/buffered_data_source.{cc,h} - Chromium's main implementation of DataSource for the media pipeline
media/blink/buffered_resource_loader.{cc,h} - Implements the sliding window buffering strategy (see below)
third_party/blink/public/platform/web_media_player.h - Blink's media player interface for providing HTML5 audio/video functionality
media/blink/webmediaplayer_impl.{cc,h} - Chromium's main implementation of WebMediaPlayer
How does everything get instantiated?WebFrameClient::createMediaPlayer() is the Blink embedder API for creating a WebMediaPlayer and passing it back to Blink. Every HTML5 audio/video element will ask the embedder to create a WebMediaPlayer.
For Chromium this is handled in RenderFrameImpl.
GN FlagsThere are a few GN flags which can alter the behaviour of Chromium's HTML5 audio/video implementation.
ffmpeg_branding
 Default: $(branding)
 Chrome - includes additional proprietary codecs (MP3, etc.) for use with Google Chrome

 Alters the list of codecs Chromium claims to support, which affects  and canPlayType() behaviour
 Values:
 0/false -  and canPlayType() assume the default set of codecs
 1/true -  and canPlayType() assume they support additional proprietary codecs
How the %#$& does buffering work?Chromium uses a combination of range requests and an in-memory sliding window to buffer media. We have a low and high watermark that is used to determine when to purposely stall the HTTP request and when to resume the HTTP request.
It's complicated, so here's a picture:
Twitch Buffering 2017 Chrome WebTwitch Vod Buffering. Twitch is the world's leading video platform and community for gamers. Libra lucky days to gamble. Don't suppose any other VM users are experiencing constant buffering with Twitch recently? Dream box games. Craps for dummies. All other online streaming is great. Speedtest is fine. It has just happened in the last 48 hours. Tried to diagnose if the problem is on my end, but all seems good so i am perhaps thinking it is a peering problem maybe. Google Chrome Extensions Except as otherwise noted, the content of this page is licensed under a Creative Commons Attribution 2.5 license, and examples.