Why doesn't anyone try opera-BETA 50 with chromium 63 ffmpeg codecs installed, since they are both built from the same sources? Instead, you all try workarounds to extract, move to the right place etc chromium 62 ffmpeg codecs to make it work with chromium-62-based opera stable.
Plus, if this really is the issue (the compatibility between the versions opera and chromium ffmpeg codecs are build), opera devs should move opera beta to stable faster. Chromium 63 reached stable at December 8th, so chromium-63-based opera beta should move to stable sooner.
Because 50's a beta, which I worry might be a worse option that adapting 49, especially if not technically able to fix other things. I didn't know about the beta, either. Opera should be getting the criticism, as they must know these issues will happen due to not releasing the right codecs at the same time. Just glad to know the option of keeping previous codecs, so things work.