[FFmpeg-trac] #1737(avcodec:new): ffmpeg detect aac stereo as mono
FFmpeg
trac at avcodec.org
Sat Sep 15 14:05:13 CEST 2012
#1737: ffmpeg detect aac stereo as mono
------------------------------------+-----------------------------------
Reporter: dmitry9 | Owner:
Type: defect | Status: new
Priority: normal | Component: avcodec
Version: git-master | Resolution:
Keywords: aac | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
------------------------------------+-----------------------------------
Comment (by dmitry9):
* QuickTime detect audio stream as Mono, 48000 and when play sound
crackles.
* MEncoder detect stream as stereo(2ch) and successfully transcode to mp3.
Play sound normal.
{{{
mencoder /tmp/audio_aac_stereo_as_mono.mp4 -oac mp3lame -ovc x264 -o
/tmp/out.avi
MEncoder SVN-r1.0~rc3+svn20090426-4.4.3 (C) 2000-2009 MPlayer Team
WARNING: OUTPUT FILE FORMAT IS _AVI_. See -of help.
success: format: 0 data: 0x0 - 0x11ef42
libavformat file format detected.
[lavf] Video stream found, -vid 0
[lavf] Audio stream found, -aid 1
VIDEO: [avc1] 360x240 24bpp 25.000 fps 0.0 kbps ( 0.0 kbyte/s)
[V] filefmt:44 fourcc:0x31637661 size:360x240 fps:25.000 ftime:=0.0400
==========================================================================
Opening audio decoder: [faad] AAC (MPEG2/4 Advanced Audio Coding)
FAAD: compressed input bitrate missing, assuming 128kbit/s!
AUDIO: 48000 Hz, 2 ch, s16le, 128.0 kbit/8.33% (ratio: 16000->192000)
Selected audio codec: [faad] afm: faad (FAAD AAC (MPEG-2/MPEG-4 Audio))
==========================================================================
Opening video filter: [expand osd=1]
Expand: -1 x -1, -1 ; -1, osd: 1, aspect: 0.000000, round: 1
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Selected video codec: [ffh264] vfm: ffmpeg (FFmpeg H.264)
==========================================================================
MP3 audio selected.
}}}
* cvlc
VLC media player 1.0.6 Goldeneye when play detect:
[0x7f2acc00e1e8] pulse audio output: No. of Audio Channels: 2
* ffmpeg when try change rate 48000 -> 22050: sound output broken. Please
see log file in attachment ffmpeg-20120914-161147.log
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1737#comment:2>
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