Configure error macport - mkvToolnix

[Ryan Schmidt]

On Sep 26, 2008, at 20:54, Mine wrote:

> I have uninstalled everything and started again. Installing mpeg4ip  
> and mkvtoolnix
> first, followed by ffmpeg, a52, faac, faad, lame, x264 and xvid.
>
> I am not sure if this is the right place for this next question,  
> but hopefully you or
> someone else may have encountered this next problem.
>
> I have been able to extract a video track from and .mkv file, but  
> when I try to convert
> the audio to aac using the following:
>
> ffmpeg -i file.mkv -vn -acodec aac -ac 2 audio.aac
>
>  I get  'unknown encoder aac'
>
> It seems to start alright with the following:
> FFmpeg version UNKNOWN, Copyright (c) 2000-2008 Fabrice Bellard, et  
> al.
>   configuration: --prefix=/opt/local --disable-vhook --mandir=/opt/ 
> local/share/man --enable-shared --enable-pthreads --disable-mmx -- 
> cc=gcc-4.0 --enable-gpl --enable-liba52
>   libavutil version: 49.7.0
>   libavcodec version: 51.60.0
>   libavformat version: 52.18.0
>   libavdevice version: 52.0.0
>   built on Sep 27 2008 00:52:03, gcc: 4.0.1 (Apple Computer, Inc.  
> build 5370)
>
> followed by many lines of this:
> [matroska @ 0x1802800]Ignoring seekhead entry for ID=0x1549a966
> [matroska @ 0x1802800]Ignoring seekhead entry for ID=0x1654ae6b
> [matroska @ 0x1802800]Ignoring seekhead entry for ID=0x114d9b74
>
> and ends with:
> Input #0, matroska, from '/Users/TWcomputer/vid_convert/Thomson/ 
> Thomson_WMV-HD_720p.mkv':
>   Duration: 00:04:39.56, start: 0.000000, bitrate: N/A
>     Stream #0.0: Attachment: 0x0000
>     Stream #0.1: Video: h264, yuv420p, 1280x720 [PAR 1:1 DAR 16:9],  
> 30.00 tb(r)
>     Stream #0.2: Audio: vorbis, 44100 Hz, stereo
> Unknown encoder 'aac'
>
> I am not sure if ffmpeg has its own encoder or if it should try to  
> use faac. Can anyone suggest how to
> solve this one.

According to "port info ffmpeg" and "port variants ffmpeg", ffmpeg  
can use faac to encode aac audio and faad to decode aac audio. Did  
you install ffmpeg with the faac and faad variants? I'm thinking you  
didn't, because ffmpeg showed you its configuration line above, and  
it doesn't include the options "--enable-libfaac" and "--enable- 
libfaad" which should appear if you had used those variants.