Adding support for encoding VP8 Alpha
This patch adds support for encoding VP8 files with alpha. The alpha channel is encoded separately and the output is placed in AVPacket's side_data. The muxer then muxes it into the BlockAdditional element of the matroska container. More details on spec here: http://goo.gl/wCP1ySigned-off-by: NVignesh Venkatasubramanian <vigneshv@google.com> Signed-off-by: NMichael Niedermayer <michaelni@gmx.at>
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