[Bug 2304189] Review Request: mozilla-openh264 - H.264 codec support for Firefox

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https://bugzilla.redhat.com/show_bug.cgi?id=2304189



--- Comment #16 from Michael Catanzaro <mcatanza@xxxxxxxxxx> ---
(In reply to Martin Stransky from comment #15)
> You can disable libopenh264/ffmpeg by media.ffmpeg.allow-openh264 pref at
> about:support. Then you may enable mozilla-openh264/GMP by media.gmp.* pref
> (not sure which one). 

I guessed correctly: it's media.gmp.decoder.preferred

With media.ffmpeg.allow-openh264 turned off, then the test video
https://test-videos.co.uk/vids/bigbuckbunny/mp4/h264/1080/Big_Buck_Bunny_1080_10s_1MB.mp4
plays if and only if media.gmp.decoder.preferred is enabled AND
mozilla-openh264 from the Cisco repo is installed.

If I install my new mozilla-openh264 package instead of the existing one, then
it crashes. So the test definitely works :) but the new mozilla-openh264
package certainly does not, alas.

The crash is in mozilla::gmp::GMPChild::GetUTF8LibPath, here:

GMP_PATH_CRASH("Plugin file does not exist");

so must be a packaging issue. Investigating...

> Testing H.264/WebRTC is tricky, you may try
> https://mozilla.github.io/webrtc-landing/pc_test.html which enables to force
> H264 but I haven't seen H264 used by WebRTC yet, usually VP8 is used in my
> case.

I'm going to give up on this. I'll be happy if we can get Big Buck Bunny to not
crash.


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