[libav-tools] avconv - converting VOB to MPG strips audio

Tim Nicholson tim.nicholson at bbc.co.uk
Mon Jan 21 08:33:53 CET 2013

On 20/01/13 14:01, James Gibbon wrote:
> On Sun, 20 Jan 2013 11:50:31 +0000
> James Gibbon <jg at jamesgibbon.com> wrote:
>> Hi,
>> I'm trying to convert VOBs losslessly to MPEG files - like this:
>>    $ avconv -i INPUT.vob -acodec copy -vcodec copy OUTPUT.mpg
>> - but I end up with an mpeg video with no audio.
> OK, apologies - I tried playing with Totem, and there IS audio in
> there. Both smplayer and avidemux complain that the OUTPUT.mpg
> as derived above has no audio track. But Totem says, under 'Audio'
> in Properties:
> Codec: Dolby Digital (AC-3)
> Channels: Stereo
> Sample rate: 48000 Hz
> Bitrate: 192 kbps
> That's exactly what it says for the output video generated by
> avidemux, yet smplayer will play the audio for that one (and
> more importantly, so will my network media player).
> How can I get avconv to do the same thing, without re-encoding
> the audio? I'm trying to keep things lossless.

Try adding -target pal-dvd (or whatever standard the vob is)

> Thanks,
> James

Tim Nicholson
Digital Media Services
BBC Studios and Post Production
+44 (0) 208 576 1229 or +44 (0) 7092 223819
Room 2517, Television Centre, Wood Lane, London, W12 7RJ
Intranet http://resources.gateway.bbc.co.uk/post_solutions/

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