[Libav-user] 转发: ask for help

Alex Cohn alexcohn at netvision.net.il
Thu Jul 7 09:42:52 CEST 2011

On Wed, Jul 6, 2011 at 03:58, 勃 王 <wb4701 at yahoo.com.cn> wrote:
>  The file created only
>  had video iformation without audio information. I think
>  there must be some problem here.
>  AVOutputFormat *fmt=guess_format ("h264", NULL, NULL);
>  fmt->audio_codec=CODEC_ID_MP3;
>  AVFormatContext pFormatCtx=av_alloc_format_contex();
>  pFormatCtx-> oformat = fmt;

To mix video with audio you need one of the container formats, like
"mp4". "h264" extension belongs to a raw video stream, which is not
designed to keep audio.


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