mmal and linux downgrade

[acconciox]

to run mpv with mmal with hardware decoding

$this->bbcode_second_pass_code('', '
Using hardware decoding (mmal).
[af] [in] 48000Hz stereo 2ch floatp
[af] [userspeed] 48000Hz stereo 2ch floatp
[af] [userspeed] (disabled)
[af] [convert] 48000Hz stereo 2ch floatp
[ao] Trying audio driver 'alsa'
')
i had to downgrade linux and firmware

$this->bbcode_second_pass_code('', 'downgraded linux-raspberrypi-headers (4.19.30-1 -> 4.19.29-1)
downgraded linux-raspberrypi (4.19.30-1 -> 4.19.29-1)
downgraded raspberrypi-bootloader (20190324-1 -> 20190308-1)
downgraded raspberrypi-bootloader-x (20190324-1 -> 20190308-1)
downgraded raspberrypi-firmware (20190320-1 -> 20190308-1)
')
so locally

$this->bbcode_second_pass_code('', 'local/linux-raspberrypi 4.19.29-1
The Linux Kernel and modules - Raspberry Pi
local/linux-raspberrypi-headers 4.19.29-1
Header files and scripts for building modules for linux
kernel - Raspberry Pi

local/linux-raspberrypi-headers 4.19.29-1
Header files and scripts for building modules for linux kernel - Raspberry Pi
local/raspberrypi-bootloader 20190308-1
Bootloader files for Raspberry Pi
local/raspberrypi-bootloader-x 20190308-1
Bootloader with extra codecs for Raspberry Pi
local/raspberrypi-firmware 20190308-1
')

is anyone with same problem? where do i have to report this problem?
Im using ffmpeg-mmal and mpv-rpi

$this->bbcode_second_pass_code('', 'local/ffmpeg-mmal 1:4.1.1-1
ffmpeg built with MMAL hardware acceleration support for Raspberry P
local/mpv-rpi 1:0.29.1-1
mpv with Raspberry Pi support')

[schard]

Why did you have to downgrade?
This sounds like a XY problem.
What actual problem did you face with the up-to-date packages?