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audio object type 23 not supported

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Jim Jazwiecki

audio object type 23 not supported

This might be something to take up somewhere else, but because I
hadn't run into this problem outside of ffmpeg, I thought I'd ask here
first. OS X 10.5's Quicktime Pro encodes AAC in exported movies as
AAC LD, which is new to 10.5. As far as I can tell, libfaad supports
AAC LD (the object type 23 in question, I think). Before we updated
ffmpeg, we never had any problems transcoding files that had been
exported in Leopard or Tiger, but now we're having sporadic problems
with Leopard- the "audio object type 23 not supported" error.

Here's our command and the output, although this also happens with
other formatting options (FLV with MP3 audio, etc):

-bash-3.1$ ffmpeg -i bookstore2.mov -f ipod bookstore_ipod.m4v
FFmpeg version SVN-r15975, Copyright (c) 2000-2008 Fabrice Bellard, et al.
configuration: --enable-gpl --enable-nonfree --enable-pthreads
--enable-swscale --enable-libamr-nb --enable-libamr-wb
--enable-libfaac --enable-libfaad --enable-libmp3lame --enable-libx264
--cc=gcc -m32 --arch=i386
libavutil 49.12. 0 / 49.12. 0
libavcodec 52. 5. 0 / 52. 5. 0
libavformat 52.23. 1 / 52.23. 1
libavdevice 52. 1. 0 / 52. 1. 0
libswscale 0. 6. 1 / 0. 6. 1
built on Dec 1 2008 22:59:41, gcc: 4.1.1 20070105 (Red Hat 4.1.1-52)

Seems stream 1 codec frame rate differs from container frame rate:
600.00 (600/1) -> 15.00 (15/1)
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'bookstore2.mov':
Duration: 00:07:06.59, start: 0.000000, bitrate: 757 kb/s
Stream #0.0(eng): Audio: aac, 44100 Hz, stereo, s16
Stream #0.1(eng): Video: h264, yuv420p, 448x336, 15.00 tb(r)
Output #0, ipod, to 'bookstore_ipod.m4v':
Stream #0.0(eng): Video: libx264, yuv420p, 448x336, q=2-31, 200
kb/s, 15.00 tb(c)
Stream #0.1(eng): Audio: libfaac, 44100 Hz, stereo, s16, 64 kb/s
Stream mapping:
Stream #0.1 -> #0.0
Stream #0.0 -> #0.1
[libx264 @ 0x8950440]using cpu capabilities: none!
[libx264 @ 0x8950440]profile Baseline, level 2.1
[aac @ 0x89111c0]Audio object type 23 is not supported.
Error while opening codec for input stream #0.0

Here are my questions:

1. Has anyone else seen this before?
2. Is there any good fix or workaround?
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Benjamin Larsson-2

Re: audio object type 23 not supported

Jim Jazwiecki wrote:

> This might be something to take up somewhere else, but because I
> hadn't run into this problem outside of ffmpeg, I thought I'd ask here
> first. OS X 10.5's Quicktime Pro encodes AAC in exported movies as
> AAC LD, which is new to 10.5. As far as I can tell, libfaad supports
> AAC LD (the object type 23 in question, I think). Before we updated
> ffmpeg, we never had any problems transcoding files that had been
> exported in Leopard or Tiger, but now we're having sporadic problems
> with Leopard- the "audio object type 23 not supported" error.
>
> Here's our command and the output, although this also happens with
> other formatting options (FLV with MP3 audio, etc):
>
> [...]
> Here are my questions:
>
> 1. Has anyone else seen this before?
> 2. Is there any good fix or workaround?
>

You can use libfaad to decode instead of the native decoder. But please
upload some samples so we can add support for LD in the native decoder.

MvH
Benjamin Larsson

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