ffmpeg-videostation: divert ffmpeg to SynoCommunity version

[ymartin59]

Motivation: Ease use of SynoCommunity ffmpeg version in VideoSation.
Linked issues: #2952

Checklist

• Build rule all-supported completed successfully
• Package upgrade completed successfully
• New installation of package completed successfully

[ymartin59]

@th0ma7 I quickly build this for me to test ffmpeg patches... as I have some mkv VideoStation fails to play too.

[th0ma7]

Good, have a look at my latest -18 build in my github repo.
I think I have nailed most of the issues but ffmpeg is a heck of a beast.
What mainly missing are testing files everyone could use for proper testing along with various ways of testing things out, with and without videostation.

[th0ma7]

sed command will break the library on main 10 due to missing character.
Also I recommend creating a backup file through a one-liner command such as:

$ sudo  sed -i'-BACKUP' -e 's/eac3/ZAAP/' -e 's/dts/ZAP/' -e 's/truehd/ZAPZAP/' -e 's/main 10/ZAAAAAP/' /var/packages/VideoStation/target/lib/libsynovte.so

[kc6108]

main 10 wouldn't be found anyway; it's Main 10. It's also 7 characters long, so IGNORE should be changed to IGNORED perhaps.

See my comments here:

#2952 (comment)

Edit...

For consistency, in stop_daemon (), maybe add:

rm /var/packages/VideoStation/target/lib/libsynovte.so

[th0ma7]

Along with a move or copy of libsynovte.so-BACKUP into it's original place in stop_daemon ()

[ymartin59]

@th0ma7 Your sed proposal is a concise good idea I will give it a try

[th0ma7]

Maybie also appropriate to use a wrapper instead of symlinks such as:
https://gist.github.com/BenjaminPoncet/bbef9edc1d0800528813e75c1669e57e

[th0ma7]

Created a new wrapper that does fix the spawning of multiple ffmpeg processes:
https://github.com/th0ma7/synology/blob/master/VideoStation/ffmpeg
I'll have it tested by the community and if working out well then we could include it to this package.

[th0ma7]

Totally untested but I had a few ideas I wanted to share. Thoughts?