Tvheadend

Hi
i am a newer user for tvheadend
i wanted to install tvheadend but there are some problem to install it
i added repository (sudo apt-add-repository ppa:mamarley/tvheadend-git-stable) and then update
then
W: Failed to fetch http://ppa.launchpad.net/mamarley/tvheadend-git-stable/ubuntu/dists/trusty/main/binary-i386/Packages 404 Not Found

seams there is nor trusty package
what can i do?

i tried to install from source code but after make it searching for ffmpeg package but cant find it and finally replay error .

--2017-11-28 12:13:49-- (try:20) https://dl.bintray.com/tvheadend/misc/staticlib/Ubuntu%2014.04/i686/ffmpeg-bc5d3495eff3a1a2f0ce39fe4e28eeeb78635067.tgz
Connecting to dl.bintray.com (dl.bintray.com)|5.153.35.248|:443... failed: Connection timed out.

i checked there is not this file on that url!!!

please help me