Upgrade to Firefox 114 broke H264 video decoding. Videos are now extremely jerky, jumping forth and back as if frames were reordered. Not all H264 videos are broken. For example, on IMDb, autoplaying trailers on movie homepage are broken, but clicking through to the dedicaded trailer page gives you smooth playback. YouTube videos are also all broken if they are in H264 format. Perhaps it has to do with the complexity of layout on and around the video. Reproducible: Always Steps to Reproduce: The most reliable way to reproduce the issue is to look at IMDb autoplay trailers on movie homepages. Here's what I tried so far: - Reverting to Firefox 113 fixes the issue, but that's obviously an impractical workaround. - Wayland/X11 switch has no effect. - Software/hardware WebRender switch has no effect. - My HW does not support video decoding, but I disabled it for a while anyway and the change had no effect. - Safe mode has no effect. - Clean profile has no effect. Diagnostic data and screencast are available.
Created attachment 1970410 [details] Screencast demonstrating the issue
Created attachment 1970411 [details] about:support
Created attachment 1970416 [details] glxinfo > gfxlog.txt 2>&1
I will try to upgrade to F38, but seeing as this is related to upgrade of Firefox package, I suspect upgrade to F38 will not help.
Can you try to install ffmpeg from rpmfusion? See https://fedoraproject.org/wiki/Firefox_Hardware_acceleration for details. Thanks.
When HW acceleration is installed according to the instructions, there is no jitter. This fixes the problem for me. I still don't understand why would software video decoding fail so catastrophically. Isn't software decoding meant to be the safe fallback?
(In reply to Robert Vazan from comment #6) > When HW acceleration is installed according to the instructions, there is no > jitter. This fixes the problem for me. I still don't understand why would > software video decoding fail so catastrophically. Isn't software decoding > meant to be the safe fallback? Unless it's OpenH264 meant for WebRTC only.
This message is a reminder that Fedora Linux 37 is nearing its end of life. Fedora will stop maintaining and issuing updates for Fedora Linux 37 on 2023-12-05. It is Fedora's policy to close all bug reports from releases that are no longer maintained. At that time this bug will be closed as EOL if it remains open with a 'version' of '37'. Package Maintainer: If you wish for this bug to remain open because you plan to fix it in a currently maintained version, change the 'version' to a later Fedora Linux version. Note that the version field may be hidden. Click the "Show advanced fields" button if you do not see it. Thank you for reporting this issue and we are sorry that we were not able to fix it before Fedora Linux 37 is end of life. If you would still like to see this bug fixed and are able to reproduce it against a later version of Fedora Linux, you are encouraged to change the 'version' to a later version prior to this bug being closed.
Fedora Linux 37 entered end-of-life (EOL) status on 2023-12-05. Fedora Linux 37 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora Linux please feel free to reopen this bug against that version. Note that the version field may be hidden. Click the "Show advanced fields" button if you do not see the version field. If you are unable to reopen this bug, please file a new report against an active release. Thank you for reporting this bug and we are sorry it could not be fixed.