Hollow Audio in FFMPEG

[encodingmonkey]

Hi all, I've been having problems with audio when converting prores mov files to h264. Here's the media info: root@local-trans02:~/TEST# ffmpeg -i '/media/local-trans02/PORTABLE20-A/monster-entertainment/planet-rock-profiles-4x3/ub40.mov' ffmpeg version 0.10.3 Copyright (c) 2000-2012 the FFmpeg developers built on Nov 30 2012 18:14:50 with gcc 4.7.2 configuration: --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-version3 --enable-x11grab libavutil 51. 35.100 / 51. 35.100 libavcodec 53. 61.100 / 53. 61.100 libavformat 53. 32.100 / 53. 32.100 libavdevice 53. 4.100 / 53. 4.100 libavfilter 2. 61.100 / 2. 61.100 libswscale 2. 1.100 / 2. 1.100 libswresample 0. 6.100 / 0. 6.100 libpostproc 52. 0.100 / 52. 0.100 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2a963e0] decoding for stream 2 failed Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/media/local-trans02/PORTABLE20-A/monster-entertainment/planet-rock-profiles-4x3/ub40.mov': Metadata: major_brand : qt minor_version : 537199360 compatible_brands: qt creation_time : 2012-12-27 21:15:01 Duration: 00:24:13.64, start: 0.000000, bitrate: 48811 kb/s Stream #0:0(eng): Video: prores (apcn / 0x6E637061), yuv422p10le, 720x576, 45736 kb/s, SAR 16:15 DAR 4:3, 24.92 fps, 25 tbr, 25k tbn, 25k tbc Metadata: creation_time : 2012-12-27 21:15:01 handler_name : ?Apple Alias Data Handler Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, 4 channels, s16, 3072 kb/s Metadata: creation_time : 2012-12-27 21:15:01 handler_name : ?Apple Alias Data Handler Stream #0:2(eng): Data: none (tmcd / 0x64636D74) Metadata: creation_time : 2012-12-27 21:15:01 handler_name : ?Apple Alias Data Handler timecode : 09:59:57:07 The problem I'm having is that when I convert the audio to aac, it sounds like there's two audio streams played side by side. Attached a sample, any clue as to how to make it not sound like this?

[Selur]

ehmm,.. at least here neither libav nor quicktime do playback any sound,... -> can't here anything

[Baldrick]

Sounds okey in VLC.

Moving you our audio section.

[Selur]

doesn't in mplayer, ffplay and DirectShow based players,...
mplayer&ffmplay complain about:

[aac @ 010deb60]channel element 3.0 is not allocated

here's what mp4box reports about the file:

* Movie Info *
Timescale 1000 - Duration 00:00:22.998
2 track(s)
Fragmented File: no
File Brand isom - version 512
Created: GMT Thu Dec 27 21:15:01 2012

File has no MPEG4 IOD/OD

iTunes Info:
Encoder Software: Lavf53.32.100

Track # 1 Info - TrackID 1 - TimeScale 25 - Media Duration 00:00:18.960
Track has 2 edit lists: track duration is 00:00:23.080
Media Info: Language "English" - Type "vide:avc1" - 474 samples
Visual Track layout: x=0 y=0 width=768 height=576
MPEG-4 Config: Visual Stream - ObjectTypeIndication 0x21
AVC/H264 Video - Visual Size 720 x 576
AVC Info: 1 SPS - 1 PPS - Profile High @ Level 5
NAL Unit length bits: 32
Pixel Aspect Ratio 16:15 - Indicated track size 768 x 576
Chroma format 1 - Luma bit depth 8 - chroma bot depth 8
Self-synchronized

Track # 2 Info - TrackID 2 - TimeScale 48000 - Media Duration 00:00:22.997
Track has 2 edit lists: track duration is 00:00:23.008
Media Info: Language "English" - Type "soun:mp4a" - 1078 samples
MPEG-4 Config: Audio Stream - ObjectTypeIndication 0x40
MPEG-4 Audio MPEG-4 Audio AAC LC - 4 Channel(s) - SampleRate 48000
Synchronized on stream 1
Alternate Group ID 1

Audacity also shows only four empty tracks.
But you are right, VLC does play the audio properly.
Problem might be related to the quad channel layout,..

Channel(s) : 4
Channel(s) : 4 channels
Channel positions : Front: L C R, Side: C
Channel positions : 3/1/0
Sampling rate : 48000
Sampling rate : 48.0 KHz
Samples count : 1103904

btw. does the original sound better?