slackbuilds_ponce/multimedia/opera-developer-ffmpeg-codecs

opera-developer-ffmpeg-codecs (Extra ffmpeg codec for Opera browser)

FFMpeg prebuilt binaries with proprietary codecs and build
instructions for window, linux and osx.

For tests, go to:

 * https://html5test.com
 * https://www.youtube.com/html5
 * http://www.quirksmode.org/html5/tests/video.html