Hi Julian. For your reference, the performance of ffmpeg on a certain h.264 video decode has regressed since 4.4.0.
See: http://ex.seabright.co.nz/helpers/benchcompare for the relative numbers. We're significantly better than 4.4.0 in the two other test videos, and better than 4.5.1 in all.
The video itself is here: http://ex.seabright.co.nz/misc/cbuild/live/cbuild/files/ffmpeg/03-src13_hrc7...
ffmpeg is configured with -mfpu=vfp3 with the hand-written assembler backend turned off. The vfp3 is an accident - I forgot to explicitly set it to neon.
You can see how to ffmpeg was configured here: http://ex.seabright.co.nz/misc/cbuild/live/cbuild/lib/ffmpegbench.mk
The particular version is available here: http://ex.seabright.co.nz/misc/cbuild/live/cbuild/files/ffmpeg-0.6.tar.xz
If you have time, please have a look at it. If not file a ticket on Launchpad and we'll look at it as part of the speed improvements.
-- Michael