Bug 174416 - [GStreamer] QoS for HLS streams is not fantastic.
Summary: [GStreamer] QoS for HLS streams is not fantastic.
Status: RESOLVED WONTFIX
Alias: None
Product: WebKit
Classification: Unclassified
Component: WebKitGTK (show other bugs)
Version: WebKit Nightly Build
Hardware: Unspecified Unspecified
: P2 Normal
Assignee: Nobody
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2017-07-12 01:40 PDT by Charlie Turner
Modified: 2023-01-10 05:19 PST (History)
3 users (show)

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Description Charlie Turner 2017-07-12 01:40:37 PDT
This isn't an issue directly with WebKit, but our use of GStreamer is advantageous for getting good measurements of a varied collection of HLS streams to report upstream.
At the moment, this report is purely anecdotal. I noticed occasionally that certain streams, especially when the bitrate is changed by hlsdemux, start to lag badly, or just generally feel choppy. I verified this outside of WebKit using the gst-play tools. Viewing the same streams in Safari using Apple's media stack demonstrated there was nothing about the network per se that should account for this. My feeling is the QoS of GStreamer's HLS implementation can be improved a lot.

As a start, there's some performance tests already in Media/ that are currently disabled on all ports. They do sort of run on GTK if you manually enable them, but it would be good to investigate exactly what these do and how we compare to Apple's ports if we can get those numbers.
Comment 1 Philippe Normand 2018-01-03 01:30:44 PST
Was this reported to the GStreamer bugzilla?
Comment 2 Charlie Turner 2018-01-03 02:02:09 PST
(In reply to Philippe Normand from comment #1)
> Was this reported to the GStreamer bugzilla?

Nope, mainly because it was anecdotal, and a performance investigation is required before I felt it was useful to report upstream (need minimal testcases, permalinks to streams, etc)

I did report what is probably a related issue in https://bugzilla.gnome.org/show_bug.cgi?id=785129 (from https://bugs.webkit.org/show_bug.cgi?id=174458) but that appears to be stalled.
Comment 3 Philippe Normand 2023-01-10 05:19:06 PST
HLS is disabled since https://commits.webkit.org/258717@main.