When trying to view the following youtube videos at this link https://www.youtube.com/user/dutchsinse
won't play. A couple other people I know are having the same problems & trying to help them I found the same problem (there are also several others that have the same problems when one does a search online for HTML5 won't play in Firefox). I then followed the youtube link given in the unsupported window that popped up https://www.youtube.com/html5 . It as well as https://html5test.com/ show that H264 and MSE & H264 are NOT working. OpenH264 is installed and as far as I can tell is turned on/enabled (whether it is actually on/enabled & functioning I can't tell). I even followed a few instructions to check the about:config settings in Firefox & all that are said to deal with HTML5 playback are set to what they are supposed to be. In the past I didn't remember having any issues with HTML5 playback. Firefox is up to date 52.3.0esr (32bit).

Can someone please help.

In fact, openh264 has not changed for a long time on Firefox. Have you asked Firefox for help?
you mentioned 'didn't remember having any issues with HTML5 playback', Do you remember which version of that Firefox is?

what is your platform this issue occurred on? windows-32bits? or another platform?
I can not reproduce this issue on Mac OSX

hi @Firefox-user
I have installed the same version Firefox(52.3.0esr 32bits) on my windows PC and tried that 3 URLs you mentioned.
videos at this link https://www.youtube.com/user/dutchsinse can play normally, and H264 works well on the other 2 pages.

I can not reproduce you issue on my PC environment.

@GuangweiWang
The problem is with Windows XP SP3 32bit, with or without POSReady updates.

@Firefox-user
If you use Windows XP and FF 52.x ESR see this thread:
http://www.msfn.org/board/topic/175591-enable-mp4-h264-aac-html5-video-in-firefox-on-windows-xp-without-flash/

I can confirm this using firefox with flatpak (a new sandboxing technology on linux).
Within flatpak, there's no other h264 implementation available (I guess on Windows, Mac OS and most Linux systems firefox can simply use system decoders).

Steps to reproduce:

• an any modern linux distribution, install firefox via flatpak (https://firefox-flatpak.mojefedora.cz/)
• check https://www.youtube.com/html5

Edit:
there's an issue over here (xhorak/firefox-devedition-flatpak#22), but I guess the only reason for openh264 in firefox is to cover exactly these cases where there's no other legal way for distributing h264 decoders. Overall it seems to me openh264 in firefox is simply broken?

Edit2: ok, answer was given here: #1943
So we can close this issue

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Indeed the OpenH264 plugin is only used for WebRTC calls in Firefox not for playing back any H264 encoded videos outside of WebRTC. So this is not an OpenH264 issue.

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@nils-ohlmeier
Thank you for your answer!

close this since it is supposed to be solved in the above link.

Because H264 problem Do this
Test first If h264 can not play
https://www.quirksmode.org/html5/tests/video.html Download buku berbayar menjadi gratis di play store.

then do this
https://msfn.org/board/topic/175591-enable-mp4-h264-aac-html5-video-in-firefox-on-windows-xp-without-flash/

about:config ->
media.gmp-eme-adobe.enabled (boolean; true)
media.gmp-eme-adobe.forceSupported (boolean; true; 49.0+)
media.gmp-eme-adobe.visible (boolean; true; 49.0+)
media.gmp-eme-adobe.version (string, not integer; 17)
media.gmp-eme-adobe.abi (string; x86-msvc-x86) (EDIT: x86-msvc-x64 for 64-bit XP users)
media.gmp.decoder.enabled (boolean; true)
media.eme.enabled (boolean; true)

about:support -> open folder ->
C:Documents and SettingskkmanApplication DataMozillaFirefoxProfilesrf368dqm.default
make dir
C:Documents and SettingskkmanApplication DataMozillaFirefoxProfilesrf368dqm.defaultgmp-eme-adobe17

https://sdfox7.com/xp/sp3/EOL/primetime_gmp_win_x86_gmc_40673.zip
copy those files
eme-adobe.dll
eme-adobe.info
eme-adobe.voucher