VP3 to Theora

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== About ==
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This is a quick guid to show how to transcode VP3 (usually with MP3) to Theora.
This is a quick guid to show how to transcode VP3 (usually with MP3) to Theora.
Now, this quick guide involves a lot of tools which are either experimental or are known to be buggy. Beware. Use with caution.
Now, this quick guide involves a lot of tools which are either experimental or are known to be buggy. Beware. Use with caution.
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== NSV ==
If your Video is encapsulated in NSV you first need to remux it to AVI:
If your Video is encapsulated in NSV you first need to remux it to AVI:
mencoder -oac copy -ovc copy -fafmttag 0x55 -o vp31.avi input.nsv
mencoder -oac copy -ovc copy -fafmttag 0x55 -o vp31.avi input.nsv
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== Get the Theora code ==
Download the Theora source code (svn co http://svn.xiph.org/trunk/theora).
Download the Theora source code (svn co http://svn.xiph.org/trunk/theora).
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== Build the avi2vp3 tool ==
Go to theora/win32/experimental/transcoder/avi2vp3/
Go to theora/win32/experimental/transcoder/avi2vp3/
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Compile the tool which will extract the VP3 data out of your AVI file: gcc *.c -o avi2vp3
Compile the tool which will extract the VP3 data out of your AVI file: gcc *.c -o avi2vp3
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== Build transcoder_example ==
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Cpy theora/win32/experimental/transcoder/transcoder_example.c to theora/examples/encoder_example.c - this will replace the usual Theora encoder example with the application creating a Theora stream from the raw VP3 data.
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Copy theora/win32/experimental/transcoder/transcoder_example.c to theora/examples/encoder_example.c - this will replace the usual Theora encoder example with the application creating a Theora stream from the raw VP3 data.
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Build your copy of Theora (run autogen.sh). This has a few dependencies. The configuration process will guide you. Be patient.
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Configure your copy of Theora (run autogen.sh). This has a few dependencies. The configuration process will guide you. Be patient. Once configuration didn't complain because of missing dependencies: Invoke make.
After everything compiled you should rename the encoder_example binary (which is in the examples directory) to e.g. transcoder_example to avoid confusion.
After everything compiled you should rename the encoder_example binary (which is in the examples directory) to e.g. transcoder_example to avoid confusion.
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== Process your videos ==
* Use avi2vp3 to converter your VP3 AVI. The input file *must* be named vp31.avi, the output file will always be output.vp3
* Use avi2vp3 to converter your VP3 AVI. The input file *must* be named vp31.avi, the output file will always be output.vp3

Revision as of 16:50, 26 January 2008

Contents

About

This is a quick guid to show how to transcode VP3 (usually with MP3) to Theora.

Now, this quick guide involves a lot of tools which are either experimental or are known to be buggy. Beware. Use with caution.

NSV

If your Video is encapsulated in NSV you first need to remux it to AVI:

mencoder -oac copy -ovc copy -fafmttag 0x55 -o vp31.avi input.nsv

Get the Theora code

Download the Theora source code (svn co http://svn.xiph.org/trunk/theora).

Build the avi2vp3 tool

Go to theora/win32/experimental/transcoder/avi2vp3/

Compile the tool which will extract the VP3 data out of your AVI file: gcc *.c -o avi2vp3

Build transcoder_example

Copy theora/win32/experimental/transcoder/transcoder_example.c to theora/examples/encoder_example.c - this will replace the usual Theora encoder example with the application creating a Theora stream from the raw VP3 data.


Configure your copy of Theora (run autogen.sh). This has a few dependencies. The configuration process will guide you. Be patient. Once configuration didn't complain because of missing dependencies: Invoke make.

After everything compiled you should rename the encoder_example binary (which is in the examples directory) to e.g. transcoder_example to avoid confusion.

Process your videos

  • Use avi2vp3 to converter your VP3 AVI. The input file *must* be named vp31.avi, the output file will always be output.vp3
  • Use transcoder_example to create an Ogg Theora stream: transcoder_example output.vp3 > video.ogg
  • Use e.g. mplayer to decode the audio in the AVI file: mplayer -vo null -ao pcm vp31.avi
  • The audio will be in audiodump.wav. Encode it with e.g. oggenc: oggenc -q 1 audiodump.wav
  • Now you need to combine video.ogg and audiodump.ogg. Use oggzmerge from the oggz-tools package (at least in Ubuntu it's oggz-tools): oggzmerge video.ogg audiodump.ogg > theora.ogg

theora.ogg now should be a valid Theora + Vorbis Ogg file. Congratulations!

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