[vlc] Transcoding only audio from DVD yields a dummy audio stream

[dE]

On 02/18/13 03:05, Alan Tam wrote:
> Hi,
>
> I'm sorry if this question is silly, but I did search around the web for hours without any clues.
>
> I attempted to transcode the audio part of a DVD chapter using the following command:
>
> /Applications/VLC.app/Contents/MacOS/VLC \
> 	--play-and-exit -I dummy --no-sout-video \
> 	--sout "#transcode{acodec=mp4a,ab=256,channels=2}:std{access=file,mux=mp4,dst=test.m4a}" \
> 	"dvdsimple:///dev/disk2#2:1-2:1"
>
> That yields a file playable in VLC but not in iTunes. After inspection using ffmpeg, I note the following:
>
> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.m4a':
>   Duration: 00:08:59.6, start: 0.000000, bitrate: 238 kb/s
>   Stream #0.0(eng): Audio: aac
>   Stream #0.1(eng): Audio: aac, 48000 Hz, stereo
>
> There are two audio streams in the output file, and perhaps iTunes wants to read from only the first stream.
> I tried adding "--audio-track 0" to no avail.
>
> Anything I've done wrong, or Is it a defect of my DVD TS?
> Anything I can do to correct it except to use another software to remove the extra stream?
>
> Thanks!
>

Use map option of ffmpeg to move the second audio stream to the first.