[rudrood]

@popcornmix:
Found that starting with build 0307 my overclocked RPI3 also crashes with h264 thvheadend footage.
The crash happens direct when I start a channel. The image stops but the sound continues.

The config I used for testing looks like this: 
arm_freq=1300
over_voltage=2
sdram_freq=550
over_voltage_sdram=5
sdram_schmoo=0x02000020
dtoverlay=sdtweak,overclock_50=83
# gpu_freq=500
core_freq=500
isp_freq=500
h264_freq=500
v3d_freq=500

The maximum gpu config that doesn't crash is:
core_freq=500
# isp_freq=500
# h264_freq=500
# v3d_freq=500

Strangest thing is that even though it's h264 data, the PI crashes when I keep h264_freq=500 disabled but with isp_freq and v3d_freq enabled (also separate).

When I replace fixup.dat and start.elf with the ones you've posted earlier the problem is gone with the full overclock config (with build 0307 till 0311).