AC3 Audio is commonly used in digital TV and for DVD, where it may be called "Dolby Digital."

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Problem with 5.1 AC-3 through Alsa, Pulseaudio on SPDIF, Ubuntu 14.04

I have Ubuntu 14.04 installed (i386 Architecture) on Zotac ZBOX-ID18. I am trying to output digital surround audio through digital SPDIF output, I understand that the default SPDIF output is on PCM ...
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How to convert 5.1 AAC streams to AC3 for S/PDIF output?

I connect my PC to my home theater via SPDIF, so when watching video files that uses AAC 5.1 channels, it is downmixed to stereo and the surround channels are lost. I would like to be able to convert ...