ffdemux_mp3 not found on Precise/Quantal/Raring

I was using the ffdemux_mp3 plugin to stream MP3 files on Lucid and everything worked pretty fine! But after I upgraded to Precise, I can't find ffdemux_mp3 in gstreamer0.10-ffmpeg any more.

I did a little checking and found that:
ffdemux_mp3 is in the Lucid package build log:
https://launchpadlibrarian.net/40529791/buildlog_ubuntu-lucid-amd64.gstreamer0.10-ffmpeg_0.10.10-1_FULLYBUILT.txt.gz

But ffdemux_mp3 is NOT in the Precise/Quantal/Raring build logs:
https://launchpadlibrarian.net/89593870/buildlog_ubuntu-precise-amd64.gstreamer0.10-ffmpeg_0.10.13-1_BUILDING.txt.gz
https://launchpadlibrarian.net/104074086/buildlog_ubuntu-quantal-amd64.gstreamer0.10-ffmpeg_0.10.13-5_BUILDING.txt.gz
https://launchpadlibrarian.net/104074086/buildlog_ubuntu-quantal-amd64.gstreamer0.10-ffmpeg_0.10.13-5_BUILDING.txt.gz

Does anybody know why it is gone?
Thanks!