[MEncoder-users] AAC encoding

[Dominik 'Rathann' Mierzejewski]

On Monday, 29 January 2007 at 20:38, Olivier Rolland wrote:
> Hi,
> 
> I'm trying to mux an AAC audio stream and a X264 video stream into an
> AVI container. The audio file has been extracted in PCM from a DVD and
> encoded in AAC with faac. The video file has been encoded directly
> from the DVD:
> 
> $ mplayer -mc 0 -vc null -vo null -ao
> pcm:fast:nowaveheader:file=audio.wav -aid 129 dvd://1
> $ faac -P -R 48000 -q 157 -C 2 -X --mpeg-vers 4 -o audio.aac audio.wav
> $ mencoder -mc 0 -oac pcm -channels 1 -srate 4000 -aid 129 -sws 7 -vf
> crop=720:416:0:80,scale=464:192,hqdn3d=2:1:2,harddup -ovc x264
> -x264encopts subq=5:b_pyramid:weight_b:8x8dct:frameref=2:turbo=1:bitrate=549
> -o video.avi dvd://1
> 
> If I play both files with mplayer, they are perfectly in sync:
> 
> $ mplayer -audiofile audio.aac video.avi
> 
> However, I'm having problems when I want to mux them together in AVI.
> First, I must add -audio-demuxer aac -fafmttag 0x706D in order for
> mencoder to correclty identify the audio file (this was not needed
> with mplayer). Second, the resulting file is always out of sync. I've
> tried all combinations of -mc 0 and -noskip with no avail. I've also
> played with faac options (-r, -w, --mpeg-vers) but this doesn't help
> either and can even be worse with -w: the audio file is never demuxed
> by "mencoder --audiofile" whatever the audio-demuxer even though it is
> perfectly demuxed by "mplayer --audiofile".
> 
> $ mencoder -nosound -noskip -mc 0 -ovc copy -oac copy -o movie.avi
> -audiofile audio.aac -audio-demuxer aac -fafmttag 0x706D video.avi

AFAIR there's no way to store AAC in AVI properly.

> I've then tried to merge in MP4 with no better result.

Merge using what?

> Any idea ?

I suggest Matroska -> mkvmerge.

Regards,
R.

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