| layout | title | published |
|---|---|---|
page |
singularity (name is work in progress as well) |
false |
Transcoding Minimal Cli Linux Virtual Machine. Debian minimal iso installed in a server fashion, has ffmpeg, mediainfo ... (whatever the scripts will need), ssh server. User will connect to the machine via ssh exclusively. Version N may also have watch folder functionality.
ffdrop will be useless once main editing machines will be replaced with windows based ones. Scripting on windows is no fun.
Executable scripts in user ~/bin, modules sources from ~/bin/modules. Username = user, pass = 12345 (not sure). Each script must also carry short explanation of itself, which is displayed if script is run without parameters.
For example: timer, hasAudio, audioToAAC, isItMXF, encodeWithX264crf, ebur128 ... < written in reusable fashion (probably just bash functions).
Example pseudo script without error catching (work in progress)
# includes
source hasAudio,isItMXF,...
# config
ebur128 = false
crf = true
crfvalue = 21
vbrvalue = 2000 #bitrate
# timer start
timer start
# audio
hasAudio input && isItMXF && MXFaudio # if then else is the easy way here
if ebur128 = true
then
ebur128 && audioToAAC
else
audioToAAC
fi
# video
if crf = true
then
encodeWithX264crf $crfvalue input
else
encodeWithX2642pass
fi
# muxing
merge videoEncode and audioEncode to new mp4 or something
# echo timer
echo timer
done
Must be better than in ffdrop.
Virtual machine is connected with 2 points, under read-only ~/input there should be everything that the host is offering as input files and under ~/output is where the results go (and temporary files and encoding logs). IO speed (to and from host) is expected trouble here. How much ram, how many cores to assign to it are open questions.
Working example fstab entrie (Arch):
# virtual box shared folders, source is readonly, tmp is readwrite.
source /home/ticho/input vboxsf uid=1000,gid=100,ro,dmode=700,fmode=600,comment=systemd.automount 0 0
tmp /home/ticho/output vboxsf uid=1000,gid=100,rw,dmode=700,fmode=600,comment=systemd.automount 0 0
Final VM must be only armed with what is needed, another graphical VM shall be used for development.
Virtual machine is a single download, but encoding scripts and modules (subroutines) have their own git with some minimal readme that explains how to use them on "any" Linux.
Advanced bash guide
http://www.tldp.org/LDP/abs/html/abs-guide.html
Your voice may be heard here.
