Note: You will still need to install a suitable build environment first, containing: autoconf, automake, gcc, gcc-c++, libtool, make, nasm, pkg-config and the zlib development support files.

Using the host OS to decode—for Linux that would be system FFmpeg libs—was considered to produce the best solution for the majority of Opera's desktop users, with the least effort. You should also keep in mind that all solutions are a compromise of some kind.

Switching now to Openh264 would not be a simple undertaking and current solution does work well for many. For those of you encountering problems on Linux, I posted a work around above.

Is there any chance to make next betas to be compatible with ffmpeg 2.4.3 or when do you plan to release stable (which I hope will remain to be compatible with 2.4.3) with sidebar support ?

This could also be a good work-around…

Not really, as it is non-trivial to do and hence very unlikely (IMHO).

Okay. Anyway, the user shouldn't have to mess around with this. It would be much better if Opera included the right version of ffmpeg.

Opera installs the right version of FFmpeg. They just don't include one with built-in h.264 support due to licensing issues. H.264 is patent encumbered and not cheap. Before anyone goes and suggests Opera should just buy a license, I am fairly certain that would not be financially viable. Hence we have this non-optimal situation.

If people are continuing to have problems, just build the correct version for yourself—this is the most reliable way to ensure you have a suitable version. It is not as hard or as scary as some people might think!

First install a build environment:

sudo apt-get install automake build-essential libtool pkg-config yasm zlib1g-dev 

(For non-Debian dirstos you want to install the following packages: autoconf, automake, gcc, gcc-c++, libtool, make, nasm, pkg-config and the zlib development support files)

Fetch the source code for the version you want to install:

wget http://ffmpeg.org/releases/ffmpeg-2.6.3.tar.bz2

Extract the source code:

tar xf ffmpeg-2.6.3.tar.bz2

Build an ffmpeg suitable for Opera:

cd ffmpeg-2.6.3
./configure --build-suffix='-opera' --enable-shared --disable-programs --disable-doc --disable-debug --disable-encoders --prefix=`pwd`/staging
make install

Install the libs into Opera developer (adjust the path as needed for stable or beta):

cd staging
find lib -name '*.so*' | sudo cpio -pvd /usr/lib64/opera-developer

(You will need to restart Opera before the new libs are detected)

You can also make a backup of these binary libs to allow you to install on your other machines:

find lib -name '*.so*' | tar fvacJ ffmpeg-2.6.3-binaries.tar.xz -T-

To install from the backup archive:

sudo tar xf ffmpeg-2.6.3-binaries.tar.xz -C /usr/lib64/opera-developer

Is there any chance to make next betas to be compatible with ffmpeg 2.4.3 or when do you plan to release stable (which I hope will remain to be compatible with 2.4.3) with sidebar support ?

This could also be a good work-around, because right now it seems that one can't get support for for example H.264 in Linux Mint, and that is definitely not good.

thanks

now pera stable works fine, opera beta has sound but black screen, opera developer crash.
The point is that opera stable doesn't have sidebar, so I need beta or developer.
Any idea why they have might have issues here ?

It's because Opera Beta and Developer are based on a newer version of ffmpeg, so you'd need to install that newer version to be able to use it. I believe it's ffmpeg 2.6.x you're looking for.

http://www.webupd8.org/2014/12/how-to-get-flash-and-h264-to-work-in.html

now pera stable works fine, opera beta has sound but black screen, opera developer crash.
The point is that opera stable doesn't have sidebar, so I need beta or developer.

Any idea why they have might have issues here ?

it seems like file library responsible for that format is in Opera's folder and it's names libffmpegsumo.so

I have tried to replace that file with the one from chromium folder like in first post here:

https://forums.opera.com/topic/4627/can-you-summarize-for-me-opera-25-under-linux-with-flash-and-html5-videos

but that only craches Opera on opening that page.
It seems like Opera has broken that lib and I don't know how to fix it.

I have no idea why it doesn't work, if it requires extra codecs and in that case what these codecs are. They only thing I can say is try to run this command, restart Opera and see if that works:

sudo apt-get install ubuntu-restricted-extras

Your opera is playing that twitter video using flash player ? Maybe i have to install some additional codecs in my Linux ?