Apr 12, 2021 www-client/firefox: add Gentoo experience to new profiles. Thomas Deutschmann committed on 10 Dec 2020 15:19:42. In the following examples the www-client/firefox package will be used, but users can replace it with their package of interest. List what packages would be installed without installing them: root # emerge -pv www-client/firefox. This is the new packages.gentoo.org site. If anything isn't working as expected, contact us. You can search by atom, category, name, maintainer or combine queries. Results similar to your query will be found as well. Why would you want to use generic, probably older, bundled system libs rather than your own optimized Gentoo system libs? 'emerge -C firefox && emerge firefox-bin' although you can have both installed simultaneously.

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Hi! According to https://www.youtube.com/html5 my firefox has no H.264 and MSE & H.264 support.
On pages with html5 <video> tag with type='video/mp4' firefox tells 'Video format or MIME type is not supported'.
This happened after one of system updates (emerge -auvDN world), but i can't remeber that was updated.
I tried next steps to fix firefox:
1. Reinstall;
2. Clean profile;
3. Install all gstreamer-plugins (Although I have notebook with gentoo and almost same USE config which have H.264 support without gstreamer-plugins);
4. Reinstall/install libvpx, ffmpeg, libav;
Nothing helped.
Also in about:support there is line: Supports Hardware H264 Decoding = No; Failed to create H264 decoder.
Other video playback software (vlc, mpv, ffmpeg) works fine (even with hardware H.264 support).
How to know why firefox failing to use H.264?
My video card is NVIDIA GeForce GTX 560 Ti.

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Last edited by nshibalov on Thu Nov 17, 2016 12:34 pm; edited 1 time in total