1305340 - Re-enable low-latency mode

Status: RESOLVED FIXED

(Core :: Audio/Video: Playback, defect, P3)

Description

[Jean-Yves Avenard [:jya]]

According to bug 1301869 comment 13; simply remuxing the video prevent the file from bug 1205083 to crash...

This bug is to investigate on what the differences are, identify the problem and if possible attempt to re-enable low latency decoding on windows.

Comment 1

[Jean-Yves Avenard [:jya]]

Could you please attach the file you've remuxed?

thank you

Comment 2

[CoolCmd]

Attachment: coolcmd.zip

(In reply to Jean-Yves Avenard [:jya] from comment #1)
> Could you please attach the file you've remuxed?
in the attached archive:

original.mp4 - first 5 seconds of file 2-692-mobile.mp4 from bug 1205083.

fragmented.mp4 - original.mp4 converted to 'mse-friendly' format by GPAC version 0.5.2-DEV-rev384-gaa0f405-master.

convert original to fragmented.cmd - convert commands (for Windows).

coolcmd.html - playing back fragmented.mp4. you can also drag & drop fragmented.mp4 to firefox window.

Comment 3

[Jean-Yves Avenard [:jya]]

Attachment: Bug 1305340 - Enable low-latency decoding on Windows 10 and later. r?pehrsons

Chrome has had it enabled for years, we had disabled it originally due to crashes seen on Windows 7.

Comment 4

[CoolCmd]

Jean-Yves, why only on windows 10? chrome uses LL mode on windows 7 too.

Comment 5

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/e7f1772b4796
Enable low-latency decoding on Windows 10 and later. r=pehrsons

Comment 6

[Jean-Yves Avenard [:jya]]

(In reply to CoolCmd from comment #4)

Jean-Yves, why only on windows 10? chrome uses LL mode on windows 7 too.

Officially, LowLatency mode was introduced in Windows 8.

We're in soft freeze, I want to keep things safe. And you had crashes.
I will extend to windows 8 for FF 68

Comment 7

[Andrei Ciure[:aciure]]

https://hg.mozilla.org/mozilla-central/rev/e7f1772b4796

Comment 8

[CoolCmd]

(In reply to Jean-Yves Avenard [:jya] from comment #6)

I will extend to windows 8 for FF 68

Even FF 72 enables low-latency mode only in Windows 10 (IsWin10OrLater() in WMFVideoMFTManager.cpp)... :(