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+alsa-plugin-ffmpeg (ffmpeg plugins for ALSA)
+These are the a52 and lavcrate plugins for ALSA.
+The a52 plugin converts S16 linear format to an A52 compressed stream
+and sends it to an SPDIF output.
+The lavcrate plugin is an external rate converter using libavcodec's
+resampler, which may produce higher quality results than the libsamplerate
+converter included in Slackware's alsa-plugins package.
+These plugins are included in the alsa-plugins source, but are not
+included in Slackware's alsa-plugins package because Slackware doesn't
+ship with ffmpeg.