We intend to support the Opus audio codec in mp4 fragments and files. Opus is a royalty-free audio compression format developed by Mozilla (Xiph), Microsoft (Skype), Broadcom and others. It offers better quality for both voice and music, scaling over a wider range of network speeds and with lower latency than previous codecs. It's been in Firefox for several years and on its own is a manditory part of the WebRTC specification.
MP4 is the most widely used video format on the web today. Combining the two will give us a way to record and play back interactive WebRTC streams with Opus audio and h.264 video, which currently doesn't work because they have different container supports. We also hope to make it easier for site authors to take advantage of better compression technology by reducing migration barriers for established code based on the mp4 container. The plan is to support this through the mp4 parser rewrite Matthew Gregan and I are doing in the rust programming language, so availability will be gated by --enable-rust as well as a pref, likely media.mp4.opus.enable. Currently that would limit it to official builds on MacOS X and 64-bit Linux, but I hope there will be more soon. We do not have a target release for this yet. Whenever we feel the specification is sufficiently stable. More about Opus at https://opus-codec.org/ Draft spec at https://opus-codec.org/docs/opus_in_isobmff.html Comments welcome, -r _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
