Comment # 8 on bug 1204074 from Callum Farmer

(In reply to Klaus K���mpf from comment #6)
> Hmm, chromium directly links with libavcodec59 (bad !) while Firefox
> (apparently) loads this library dynamically (good !).
> 
> And loading a working libavcodec library is the purpose of
> mozilla-libavcodec58_91.patch - which doesn't work. :-(

No that's not how things work as in most cases linking is better to avoid
symbol errors. The codec issues are there because you are running the openSUSE
version and not the Packman version, how the library is loaded has no effect.
The issue is your zypper repo config, you need to increase priority of packman
above (lower number) openSUSE-OSS.