Convert video to WebM using GStreamer

Question

Documentation for GStreamer is confusing. This is still no excuse for resorting to StackOverflow.com, but still:

What is the GStreamer command

Answer 1

You have the pipeline elements all out of order and you have syntax errors when dealing with named elements. Try something like this:

gst-launch-0.10 filesrc location=oldfile.ext ! decodebin name=demux ! queue ! ffmpegcolorspace ! vp8enc ! webmmux name=mux ! filesink location=newfile.webm demux. ! queue ! progressreport ! audioconvert ! audioresample ! vorbisenc ! mux.

This will construct the following pipeline:

               filesrc
                  |
              decodebin
                |   |
        +-------+   +-------+
        |                   |
        |                 queue
      queue                 |
        |             progressreport
        |                   |
ffmpegcolorspace       audioconvert
        |                   |
        |             audioresample
      vp8enc                |
        |               vorbisenc
        |                   |
        +-------+   +-------+
                |   |
               webmmux
                  |
               filesink

Answer 2

If you have videos with no audio (such as videos from a service like VideoBlocks), remove the audio pipeline.