2008-08-05 06:13:31     关于执行FFmpeg

2008-08-05 06:13:31     关于执行FFmpeg

Jingwei Cheng (CHINA)

Message: 59931   

我在板上解264文件，执行命令是：ffmpeg -i input.264 output.yuv,是可以的，CIF大概可达到15fps

但想解aac编码文件时却不行，我的命令是：ffmpeg -i input.mp4 output.wav

请问下是为什么

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2008-08-05 06:40:33     Re: 关于执行FFmpeg

Yi Li (CHINA)

Message: 59934   

What is the error message when you decoding AAC?

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2008-08-05 21:05:50     回复： Re: 关于执行FFmpeg

Jingwei Cheng (CHINA)

Message: 59957   

root:/>

root:/>

root:/> ls

bin                 init              proc   tmp

mct_nero-heaac.mp4 lib               usr   dev

mnt     root     var   etc

sbin    home     sys

root:/> ffmpeg -i ct_nero-heaac.mp4 ouput.wav

FFmpeg version UNKNOWN, Copyright (c) 2000-2007 Fabrice Bellard, et al.

  configuration: --prefix=/usr --source-path=/root/uClinux-dist-2008R1-RC8/lib/ffmpeg/build/../ffmpeg-svn-11114 --target-os=Linux --cpu=bfin --arch=bfin --extra-ldflags=   -mcpu=bf537-0.2 --enable-static --enable-shared --enable-gpl --enable-pp --disable-strip --cross-prefix=bfin-linux-uclibc-

  libavutil version: 49.5.0

  libavcodec version: 51.48.0

  libavformat version: 52.1.0

  built on Aug  1 2008 20:03:40, gcc: 4.1.2 (ADI svn)

[mov,mp4,m4a,3gp,3g2,mj2 @ 0x2507a0]Could not find codec parameters (Data: mp4s / 0x7334706D)

[mov,mp4,m4a,3gp,3g2,mj2 @ 0x2507a0]Could not find codec parameters (Data: mp4s / 0x7334706D)

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'ct_nero-heaac.mp4':

  Duration: 00:00:19.9, start: 0.000000, bitrate: 65 kb/s

    Stream #0.0(eng): Audio: mp4a / 0x6134706D, 44100 Hz, stereo

    Stream #0.1(eng): Data: mp4s / 0x7334706D

    Stream #0.2(eng): Data: mp4s / 0x7334706D

Output #0, wav, to 'ouput.wav':

    Stream #0.0(eng): Audio: pcm_s16le, 44100 Hz, stereo, 1411 kb/s

Stream mapping:

  Stream #0.0 -> #0.0

Unsupported codec (id=86018) for input stream #0.0

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what error?

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2008-08-05 23:22:00     Re: 回复： Re: 关于执行FFmpeg

Yi Li (CHINA)

Message: 59962   

I search on web. As far as I understand, ffmpeg still uses libfaad for AAC decode. But someone is working on AAC decoder for ffmpeg: http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/2008-July/049330.html.

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2008-08-05 23:48:53     回复： Re: 回复： Re: 关于执行FFmpeg

Jingwei Cheng (CHINA)

Message: 59964   

what's mean with you?

I think ffmpeg must uses libfaad for AAC decode.

buf how to operation uses ffmpeg?

thanks!!!

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2008-08-06 00:22:05     Re: 回复： Re: 回复： Re: 关于执行FFmpeg

Yi Li (CHINA)

Message: 59966   

你可能在编ffmpeg的时候没有enable libfaad. 所以ffmpeg找不到codec. 你可以在网上搜一下怎么编译。

(为了让只懂英文的同志们看懂，重复一下：

You may need to enable libfaad when you build ffmpeg, otherwise ffmpeg cannot find proper decoder for AAC.

)

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2008-08-06 00:40:36     Re: 回复： Re: 回复： Re: 关于执行FFmpeg

Yi Li (CHINA)

Message: 59969   

If you want to decode AAC, I think you can use mplayer - it uses libfaad.

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2008-08-06 04:50:14     回复： Re: 回复： Re: 回复： Re: 关于执行FFmpeg

Jingwei Cheng (CHINA)

Message: 59976   

how to enable libfaad on ffmpeg?

how to operate on the uclinux08r1/lib/ffmpeg?

mplayer can decode h264??

thank you?

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2008-08-06 05:17:24     Re: 回复： Re: 回复： Re: 回复： Re: 关于执行FFmpeg

Yi Li (CHINA)

Message: 59981   

Yes. Mplayer can decode h264.