The VideoLAN Forums

Posted: **04 May 2010 17:27**

After some problems with the command line on Windows I'm finally ready to start transcoding. But I can't get the aspect-ratio option to work.

I have some files that are badly encoded with the wrong AR. If I play them in VLC the picture is all squashed. It's easy to change this in the GUI. Select 16:9 and the picture is perfect. So I want to transcode them to the correct aspect ratio. But it's impossible.

From the command line I can get the file to play on the screen in the correct AR using

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vlc vts_01_0.vob --aspect-ratio "16:9"

But whatever I do I can't get it to transcode to the correct AR. I thought a command like this would work.

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vlc "vts_01_0.vob" --aspect-ratio "16:9" --sout "#transcode{vcodec=mp2v}:std{access=file,mux=ps,dst="vlcfile.mpg"}"

It doesn't work. The aspect ratio of the output file is still wrong.

I then tried duplicate so I could observe what was happening

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vlc "vts_01_0.vob" --aspect-ratio "16:9" --sout "#transcode{vcodec=mp2v}:duplicate{dst=std{access=file,mux=ps,dst="vlcfile.mpg"},dst=display}"

This produces the *correct* AR on the screen, but the *wrong* AR in the output file.

I read somewhere that it may be a bug in the current version. So I downloaded 1.2.0-git-20100502 ... etc, but it was no better.

Can anyone suggest how to do this.

Posted: **05 May 2010 00:44**

put aspect-ratio inside the transcode.

Posted: **05 May 2010 05:26**

Hi j-b. I don't know the correct syntax to include the aspect ratio inside the transcode. I tried this but it didn't work.

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vlc "vts_01_0.vob" --sout "#transcode{vcodec=mp2v,aspect-ratio=16:9}:std{access=file,mux=ps,dst="vlcfile.mpg"}"

This gave an error in the message window as follows.

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main warning: option aspect-ratio is unknown

Since then I have tried using the canvas filter like this

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vlc "vts_01_0.vob" --sout "#transcode{vcodec=mp2v,vb=4096,vfilter=canvas{width=720,height=576,aspect=16:9}}:std{access=file,mux=ps,dst="vlcfile.mpg"}"

This is now giving me the correct aspect ratio. !!!!

But it is producing a lot of other errors. During transcoding the time jumps very jerkily and the output file is incomplete. I get many errors like this in the message window. The input file plays properly apart from having the wrong aspect ratio.

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avcodec warning: almost fed libavcodec with a frame in the past (current: 8437408078, last: 8449118567)
avcodec warning: almost fed libavcodec with a frame in the past (current: 8437448078, last: 8449118567)

Can you tell me what is wrong now. I'm sorry to ask so many questions. It would not be necessary if the documentation was easier to understand.

Thanks, Bob

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Aspect ratio won't work with transcode

Aspect ratio won't work with transcode

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Re: Aspect ratio won't work with transcode