AAC-SSR profile not implemented in ffmpeg

[Oliver Rath]

mpv (on Ubuntu 17.10) cant play i.e. "Die Anstalt" Mediathek mp4-file:

...

Error decoding audio.
[ffmpeg/audio] aac: SSR is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.
[ffmpeg/audio] aac: If you want to help, upload a sample of this file to ftp://upload.ffmpeg.org/incoming/ and contact the ffmpeg-devel mailing list. (<email address hidden>)

$ lsb_release -rd
Description: Ubuntu 17.10
Release: 17.10

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: ffmpeg 7:3.3.4-2
Uname: Linux 4.14.3-041403-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.6
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Fri Dec 8 23:28:18 2017
InstallationDate: Installed on 2017-06-05 (186 days ago)
InstallationMedia: Ubuntu-Server 16.10 "Yakkety Yak" - Alpha amd64 (20160525)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: ffmpeg
UpgradeStatus: Upgraded to artful on 2017-10-01 (68 days ago)

[James Cowgill (jcowgill)]

Indeed there is no implementation of the AAC-SSR profile in ffmpeg. I think this is because it's quite rare, so no one has yet worked on it.

There is an upstream bug, but it's had no activity for 5 years:
https://trac.ffmpeg.org/ticket/1693

[Carl Eugen Hoyos (cehoyos)]

Where can I find the sample you tested?

[Carl Eugen Hoyos (cehoyos)]

The following three samples do not contain SSR audio:

$ md5sum 171205_sendung_dan_*
9f0d5b05a77904063f47f421d21c3d24 171205_sendung_dan_1496k_p13v13.mp4
08bde305b9425cc5c2a90ea431854045 171205_sendung_dan_3296k_p15v13.mp4
00aad320db7317fec7e9a3edae106f92 171205_sendung_dan_476k_p9v13.mp4

[James Cowgill (jcowgill)]

Carl, I don't understand why you marked this bug incomplete.

[Carl Eugen Hoyos (cehoyos)]

No sample was provided (this is explicitely required by the warning message that the aac decoder shows). It is possible that the sample Oliver played had a reception issue that lead to an incorrect warning message: I downloaded all available samples that he indicated show the issue, none of them contain SSR and I suspect that no encoder used by a big television station allows to encode SSR.

[Carl Eugen Hoyos (cehoyos)]

The underlying issue - that some reception errors could trigger the "SSR" warning message when decoding AAC - was fixed by Dale Curtis, the patch is part of FFmpeg 4.0:
http://git.videolan.org/?p=ffmpeg.git;a=commitdiff;h=a246701e