Pin ffmpeg packages to have the same version as the browser.
Pin ffmpeg packages to have the same version as the browser.

guorendong/iridium-browser-ubuntu,guorendong/iridium-browser-ubuntu,guorendong/iridium-browser-ubuntu,guorendong/iridium-browser-ubuntu,guorendong/iridium-browser-ubuntu,guorendong/iridium-browser-ubuntu,guorendong/iridium-browser-ubuntu,guorendong/iridium-browser-ubuntu,guorendong/iridium-browser-ubuntu,guorendong/iridium-browser-ubuntu