Media playback issues with ffmpeg 8.0 (rebuild required?)

Description:

The ffmpeg package has been updated in testing and Firefox has some media playback issues now.

When trying to seek a H264 video, it fails with "Video can't be played because the file is corrupt." message. Prints such errors to cli:

[Child 78007, MediaDecoderStateMachine #1] WARNING: Decoder=7f912bf39d00 Decode error: NS_ERROR_DOM_MEDIA_FATAL_ERR (0x806e0005): file /usr/src/debug/firefox/firefox-143.0.3/dom/media/MediaDecoderStateMachineBase.cpp:168
[Child 78007, MediaDecoderStateMachine #1] WARNING: Decoder=7f9135f1b100 Decode error: NS_ERROR_DOM_MEDIA_FATAL_ERR (0x806e0005) - virtual RefPtr<MediaDataDecoder::DecodePromise> mozilla::GMPVideoDecoder::Decode(MediaRawData *): mGMP not initialized: file /usr/src/debug/firefox/firefox-143.0.3/dom/media/MediaDecoderStateMachineBase.cpp:168

So I guess it needs a rebuild?

Additional info:

• package version(s): firefox 143.0.3-1, ffmpeg 2:8.0-2

Steps to reproduce:

1. Open e.g. this video in Firefox, play it and then try to seek.