GNU bug report logs - #77559
mullvadbrowser & torbrowser can’t play AAC LATM streams

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From: Ian Eure <ian@HIDDEN>
To: bug-guix@HIDDEN
Subject: mullvadbrowser & torbrowser =?utf-8?Q?can=E2=80=99t?= play AAC LATM
 streams
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Date: Sat, 05 Apr 2025 11:51:21 -0700
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When testing patches for #77460 and #77461, I noticed that neither=20
mullvad nor torbrowser can play live videos.  ex. if you launch=20
either browser, navigate to youtube.com, search "live" and click=20
on any video with the red "live" badge, you get a "Your browser=20
can=E2=80=99t play this video" error.

If I launch Mullvad from a shell, I see this output:

[Child 22618, MediaDecoderStateMachine #1] WARNING:=20
Decoder=3D7efdca045b00 Decode error: NS_ERROR_DOM_MEDIA_FATAL_ERR=20
(0x806e0005) - Error no decoder found for audio/mp4a-latm: file=20
/tmp/guix-build-mullvadbrowser-14.0.7.drv-0/firefox-mullvad-browser-128.8.0=
esr-14.0-1-build2/dom/media/MediaDecoderStateMachineBase.cpp:167

This seems related to #72265, which was a report about LibreWolf=20
not enabling hardware acceleration for video decoding; after=20
applying the provided patch, the same problem resulted.  I think=20
the same situation is happening with these browsers.  I don=E2=80=99t have=
=20
a satisfying fix; LW still has no hwaccel support, and neither=20
does Firefox in nonguix.

Mullvad=E2=80=99s about:support claims AAC is supported with hardware=20
acceleration.  LATM is a container format[1], not a codec, and=20
doesn=E2=80=99t show up anywhere on that page.  Per the FFmpeg changelog,=20
LATM support was added to in version 0.9(!), and doesn=E2=80=99t appear to=
=20
have a configure flag to control whether it=E2=80=99s enabled or not.  So=20
it=E2=80=99s not clear to me why Firefoxen aren=E2=80=99t able to decode th=
ese=20
streams.

Thanks,
  -- Ian

[1]:=20
https://en.wikipedia.org/wiki/Advanced_Audio_Coding#Container_formats