This is the basic summary of the problem I have for all this:

OS: Windows 7 SP1 64-bit
CPU: Intel Core i3-380M, 2533 MHz
GPU: Built-in Intel HD Graphics (possibly 1st-gen)

In Opera (latest Stable (56) and Developer (57)), Vivaldi (Stable and Snapshot), Chromium (latest Chromium 71 build), all with fresh profiles, videos on messenger.com don't play properly. There's audio, but no video. Video only plays correctly in Chrome and Brave.

Masking as Chrome does not help.

Right.

Odd that it plays in Brave when Brave isn't supposed to use ffmpeg for proprietary codecs.

No codec packs installed on Windows 7.

Nope

OS: Windows 7 SP1 64-bit
CPU: Intel Core i3-380M, 2533 MHz
GPU: Built-in Intel HD Graphics (possibly 1st-gen)

In Opera (latest Stable (56) and Developer (57)), Vivaldi (Stable and Snapshot), Chromium (latest Chromium 71 build), all with fresh profiles, videos on messenger.com don't play properly. There's audio, but no video. Video only plays correctly in Chrome and Brave.

Masking as Chrome does not help.

Odd that it plays in Brave when Brave isn't supposed to use ffmpeg for proprietary codecs.

No codec packs installed on Windows 7.

https://www.google.com/search?q=best+codec+pack+for+windows+7.

I don't know which one is best and don't know which ones are safe (and don't install extra crap) though, so do your research first.

Windows 7 SP1

It's not the 'N' version of Windows 7 is it? If so, you need something like https://www.microsoft.com/en-us/download/details.aspx?id=16546.

Another thing. opera://flags/#dynamic-demuxer-selection is enabled by default as it helps Opera play a lot more videos and such. But, you could turn it off, restart Opera and see if it makes a difference. If so, maybe it's something Opera could fix. Turn it back on when you're done testing.

Also, just in case it's a weird autoplay restriction, set opera://flags/#autoplay-policy to "No user gesture required" and restart.

No.
Worse: i have no sound on the video.
Oh yes! Maybe I didn't say that I have the sound (of the video) but NOT the video...
Sorry if I missed this crucial information!

Well, it sounds dead, man...

Another thing to try. Goto https://blogs.opera.com/desktop/ and look at the "Latest Downloads" section on the right side. Click the link for "Windows x64 (Offline)" under "Opera Developer" and install that. You can do a standalone installation or regular, doesn't matter. The regular installation wont' mess with your regular Opera and won't use its settings. Do you have 64-bit Windows 7 or 32-bit though? If 32-bit, you need to download the non-64-bit one. If you are using 32-bit Windows, maybe it's an issue with 32-bit support for videos in messenger with your GPU.

That's just to see if the issue is already fixed in an upcoming version of Opera. If it's fixed there, it might be eventually fixed in Vivaldi too.

There's a similar download option at https://vivaldi.com/blog/snapshots/ for Vivaldi. See the "snapshot" link in the panel on the right of the page. This snapshot will use your regular Vivaldi settings, but won't install in a separate place.

Finally, go to http://chromium.woolyss.com/download/en/ and download and install Chromium (What Opera, Vivaldi, Chrome and such are based on) to see if has the issue too. If so and things only work right in Chrome, Chrome might be allowing some to work with your GPU. Or, it's something with the fact that Chrome uses ffmpeg to its fullest (for proprietary codecs) while other Chromium browsers do not.

Do install https://www.reddit.com/r/operabrowser/wiki/opera/extensions/mask_as_chrome though to see if it helps. If so, it's just a Facebook browser-detection issue.

When you're done testing, you can go into programs and features in the Windows control panel and uninstall Vivaldi, Opera Developer and Chromium if you want.

One other thing to do would be to post the contents of the details of the player (when you click on it to expand it, after trying to play the video) in opera://media-internals so we can see what type video file its trying to play.

None of this fix the problem

Also, just in case it's a weird autoplay restriction, set opera://flags/#autoplay-policy to "No user gesture required" and restart.

As in, too bad you didn't have Windows 10 to test with your exact same setup. Windows 10 has better media support. As in, Opera might require Windows 10 for some things.

I don't have this option

Try this installer ftp://ftp.opera.com/pub/opera/desktop/56.0.3051.31/win/. 64-bit one if you're using 64-bit Windows 7.

When the installer launches, click "options".

That's just to see if the issue is already fixed in an upcoming version of Opera. If it's fixed there, it might be eventually fixed in Vivaldi too.

There's a similar download option at https://vivaldi.com/blog/snapshots/ for Vivaldi. See the "snapshot" link in the panel on the right of the page. This snapshot will use your regular Vivaldi settings, but won't install in a separate place.

Finally, go to http://chromium.woolyss.com/download/en/ and download and install Chromium (What Opera, Vivaldi, Chrome and such are based on) to see if has the issue too. If so and things only work right in Chrome, Chrome might be allowing some to work with your GPU. Or, it's something with the fact that Chrome uses ffmpeg to its fullest (for proprietary codecs) while other Chromium browsers do not.

Do install https://www.reddit.com/r/operabrowser/wiki/opera/extensions/mask_as_chrome though to see if it helps. If so, it's just a Facebook browser-detection issue.

When you're done testing, you can go into programs and features in the Windows control panel and uninstall Vivaldi, Opera Developer and Chromium if you want.

One other thing to do would be to post the contents of the details of the player (when you click on it to expand it, after trying to play the video) in opera://media-internals so we can see what type video file its trying to play.

The video is a .mp4 in Facebook.
Am I the only one to have this issue?

If you want, try it again. After you change the install path to a folder on you desktop, make sure it says "standalone installation" for "install for".

I don't have this option...
Impossible to bypass my settings...

Plus, the issue is in Vivaldi too

Good to know.

@jfhicter said in Facebook videos issue:

Didn't succeeded to do that: Opera is launching with my settings and the issue is still there

If you want, try it again. After you change the install path to a folder on you desktop, make sure it says "standalone installation" for "install for". When finished installing, it'll automatically launch that Opera with its own settings where Opera Sync isn't enabled by default or anything. Something must not have been right with the installation settings. It probably won't help though if it does it in Vivaldi too, but give it a shot.

@jfhicter said in Facebook videos issue:

until 56 is messing with bookmarks bar spaces

Other users have noticed a change in that area and have mentioned it. Hopefully it'll get fixed.

Great!

2 other things to try.

1. Download the Opera installer, launch it, click "options", set "install path" to a folder on your desktop, set "install for" to "standalone installation" and install. Test in that Opera. Do not enable Opera Sync or anything like that. If it works there, it's just something messed up with your normal Opera profile.

Didn't succeeded to do that: Opera is launching with my settings and the issue is still there

You can delete the folder when you're done testing.

2. Create another user on Windows (Control Panel\User Accounts\User Accounts\Manage Accounts and click add new user at the bottom), log out of your user account and log into the new account and test Opera. If it works there, there's something wrong with your normal Windows user account that affects Opera.

You can delete the Windows user account when you're done testing.

Did that: issue remains

until 56 is messing with bookmarks bar spaces

Other users have noticed a change in that area and have mentioned it. Hopefully it'll get fixed.

1. Download the Opera installer, launch it, click "options", set "install path" to a folder on your desktop, set "install for" to "standalone installation" and install. Test in that Opera. Do not enable Opera Sync or anything like that. If it works there, it's just something messed up with your normal Opera profile.

You can delete the folder when you're done testing.

2. Create another user on Windows (Control Panel\User Accounts\User Accounts\Manage Accounts and click add new user at the bottom), log out of your user account and log into the new account and test Opera. If it works there, there's something wrong with your normal Windows user account that affects Opera.

You can delete the Windows user account when you're done testing.

Thanks. It doesn't solve the problem...

If I think of anything else, I'll post.

Thanks. It doesn't solve the problem...
Well... I stay on Opera because it is fast and well designed -- until 56 is messing with bookmarks bar spaces -- but I'm quite pissed off it mess with such things Chrome does...
Is Opera not supposed to be a Chrome killer?