FFmpeg prebuilt binaries for NW.js / Chromium
How to Install libffmpeg (for proprietary h.264 and aac support) for Opera for Linux_x64 Goto the URL opera://about and look at the "Browser identification" (User-Agent) string to see what major version of Chromium Opera is using (79, 80, 81, 82 etc.). Also, take note of the "install" path. You'll need that later. Goto https://github.com/iteufel/nwjs-ffmpeg-prebuilt/releases/ and download the latest -linux-x64.zip that's built with the same major version of Chromium that your Opera is. For example, if your Opera is built with Chromium 79, goto https://github.com/iteufel/nwjs-ffmpeg-prebuilt/releases/tag/0.43.6 and download 0.43.6-linux-x64.zip. Or, goto https://packages.ubuntu.com/search?keywords=chromium-codecs-ffmpeg-extra and click on the link to the distro that has "chromium-codecs-ffmpeg-extra" for the version of Chromium you need. Then, on the page for the distro, click the "amd64" link to goto the download page. On the download page, you can download the deb file and then extract it to get libffmpeg.so out of it. For example, if you need libffmpeg.so for Chromium 81, goto https://packages.ubuntu.com/focal-updates/amd64/chromium-codecs-ffmpeg-extra/download and download the the deb file. (in this case though, ignore that and use the libffmpeg.so in http://security.ubuntu.com/ubuntu/pool/universe/c/chromium-browser/chromium-codecs-ffmpeg-extra\_83.0.4103.61-0ubuntu0.18.04.1\_amd64.deb that's from https://packages.ubuntu.com/bionic/chromium-ffmpeg-extra even though it says it's for Chromium 83) If nothing works, try a libffmpeg.so for the next version of Chromium and so on. Once you have the zip/deb file, extract it to get libffmpeg.so. Then, create the folder lib_extra in Opera's install folder that you took note of in opera://about earlier and put libffmpeg.so in the lib_extra folder. The path to libffmpeg.so should then be opera_install_folder/lib_extra/libffmpeg.so. On Linux Mint, that'd be /usr/lib/x86_64-linux-gnu/opera/lib_extra/libffmpeg.so. On Arch Linux, it might be /usr/lib64/opera/lib_extra/libffmpeg.so. Again, goto the URL opera://about in Opera and look at the "install" path.
How well does your browser support HTML5?
To test to make sure the libffmpeg.so you got is working, start Opera and goto https://html5test.com/. Make sure h.264 is listed as supported under the Video section. Make sure AAC is listed as supported under the Audio section. Make sure they're both supported on the video and audio codec sections in the Streaming section. Note that after searching for libffmpeg.so in the lib_extra folder, if Opera doesn't find one, Opera will search for libffmpeg.so in the paths listed in opera_install_folder/resources/ffmpeg_preload_config.json (to pick up versions that are already installed by Chrome or Chromium or some package), that may or may not be compatible with the major version of Chromium your Opera is built with. You can edit these paths, but note that your changes to ffmpeg_preload_config.json will be overwritten on upgrade. In short, if you make use of the lib_extra folder and put a compatible libffmpeg.so in there, Opera will use that one and not mess with any of the other ones that might not be compatible. Note though, that when your Opera upgrades, if the new version uses a new major version of Chromium, you'll have to repeat these steps and replace lib_extra/libffmpeg.so with a newer one that's compatible with the new major version of Opera. This of course means too that if you have Opera Beta and Opera Developer, they're going to need their own libffmpeg.so versions in there lib_extra folders in their install directories. opera_beta_install_folder/lib_extra/libffmpeg.so and opera_developer_install_folder/lib_extra/libffmpeg.so for example. If you can't find versions of libffmpeg for Opera Beta and Opera Developer at https://github.com/iteufel/nwjs-ffmpeg-prebuilt/releases/, you'll have to look elsewhere for versions that match the higher major versions of Chromium they use. After you get h.264 and aac support working, you might want to get Encrypted Media Extensions (Widevine) working. See https://www.reddit.com/r/operabrowser/wiki/opera/linux\_widevine\_config for that. See https://forums.opera.com/post/208777 for an alternative way to get libffmpeg.
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