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Clément MATHIEU edited this page Jan 5, 2014 · 3 revisions

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It does not work. What should I do ?

Read the Setup Guide again.

If it still do not work, please open a bug report. It could be due to a change in the InfoQ markup or some integration issue like your ffmpeg version.

Is Windows supported ?

I don't know.

I have not tested Windows support and I am not interested to do it. The code is designed to be portable, so if you manage to install the native dependencies it should be ok.

How long does it take to create the final video ?

It mainly depends of two things:

  • Your network bandwidth
  • Your CPU and the specified output format

First the video has to be download. The usual size of a video is 100 to 200MB, I let you do the math.

Then the final video has to be created by ffmpeg. The legacy and h264 output formats are quite fast. It usually takes less than one minute on a modern CPU, and five to ten minutes on an Atom. The h264_overlay output format is usually ten times slower. It will most likely takes 10 minutes to convert an one hour presentation on a modern CPU.

Why do I need rtmpdump ? The mobile website allows HTTP downloads !

You are right. However, presentations created before July 2011 only support rtmp not HTTP. I believe that some of theses presentations are still valuables.

I could make rtmpdump optional too. But I don't want to make the code more complex than it has to be. rtmpdump is not that hard to install.

I will reconsider this point in few months/years when the content from 2010 will be mostly outdated.