#10153: AAC-LATM: Mono identified as stereo
-------------------------------------+-------------------------------------
Reporter: Peter | Type: defect
Krefting |
Status: new | Priority: normal
Component: | Version: git-
undetermined | master
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Summary of the bug:
AAC-LATM sample with one center channel is identified as stereo by
ffprobe; mediainfo identifies it as mono, which is what I expect.
How to reproduce:
{{{
$ ./ffprobe mono.aac
ffprobe version N-109662-g2c3107c3e9 Copyright (c) 2007-2023 the FFmpeg
developers
built with gcc 10 (Debian 10.2.1-6)
configuration:
libavutil 57. 44.100 / 57. 44.100
libavcodec 59. 57.100 / 59. 57.100
libavformat 59. 36.100 / 59. 36.100
libavdevice 59. 8.101 / 59. 8.101
libavfilter 8. 54.100 / 8. 54.100
libswscale 6. 8.112 / 6. 8.112
libswresample 4. 9.100 / 4. 9.100
Input #0, loas, from 'mono.aac':
Duration: N/A, bitrate: N/A
Stream #0:0: Audio: aac_latm (HE-AACv2), 48000 Hz, stereo, fltp
$ mediainfo mono.aac
General
Complete name : mono.aac
Format : LATM
File size : 392 KiB
Overall bit rate mode : Variable
Audio
Format : AAC LC SBR
Format/Info : Advanced Audio Codec Low
Complexity with Spectral Band Replication
Commercial name : HE-AAC
Format settings : NBC
Codec ID : 2
Bit rate mode : Variable
Channel(s) : 1 channel
Channel layout : C
Sampling rate : 48.0 kHz
Frame rate : 23.438 FPS (2048 SPF)
Compression mode : Lossy
}}}
Sample file can be downloaded at
https://e1.pcloud.link/publink/show?code=XZqLcmZ3cdBnltyjjbn3SiSAnKpaFxvKHwk
Initially I thought this was the same as #3361, but the warning message
added in
[http://git.videolan.org/?p=ffmpeg.git;a=commitdiff;h=6406d5e430953085a0100b44dd8fceb478b383e2
6406d5e430953085a0100b44dd8fceb478b383e2] is, as far as I can tell, not
issued.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/10153>
FFmpeg <https://ffmpeg.org>
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