= WebP Encoding =

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This [/wiki/Encoding] has 3 encoders:
* a Cython based encoder using the [https://developers.google.com/speed/webp/docs/api#encodingadvancedapi Advanced Encoding API] (only available in version 0.13 onwards) which is faster
* a {{{python-webm}}} fallback
* fallback to [/wiki/Encodings/Pillow]

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And 2 decoders:
* a {{{python-webm}}}
* fallback to [/wiki/Encodings/Pillow]

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Be aware that although {{{webp}}} offers efficient compression, it can be quite slow at times, especially in "lossless" mode.
}}}

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== Updated python-webm ==

We carry a modified version of {{{python-webm}}}, with the following changes:
* [https://code.google.com/p/python-webm/issues/detail?id=2 support for lossless modes]
* [#491 memory leak fixed]
* removed buggy code in YUV to RGB conversion files - which we don't need since we have our own [/wiki/CSC colourspace conversion] modules.

== Source ==
You can find source snapshots here:
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[http://xpra.org/src/]

The source is kept in xpra's source tree under [/browser/xpra/trunk/src/xpra/codecs/webm src/xpra/codecs/webm] and the tests are under [/browser/xpra/trunk/src/tests/webm src/tests/webm]
}}}

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== Links and Tickets ==

* [https://developers.google.com/speed/webp/ WebP] upstream: ''A new image format for the Web''
* [https://code.google.com/p/python-webm/ python-webm] upstream
* #491: ''webp is leaking memory'' (same bug in Python Pillow: [https://github.com/python-imaging/Pillow/issues/586 Pillow issue 586])
* [ticket:419#comment:4]: ''better/faster lossless encoding selection'': webp lossless can be extremely slow!
}}}